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6.a. Dakota Aggregates Mineral Extraction Permit and IUP Request
4 ROSEMOUNT EXECUTIVE SUMMARY PLANNING COMMISSION Planning Commission Public Hearings: August 28 and September 25, 2012 AGENDA ITEM: Case 12- 17 -ME; 12- 18 -ME; 12 -19 -IUP Request by Dakota Aggregates for a Large Scale Mineral Extraction Permit, AGENDA SECTION: Annual Operating Permit for Dry/Wet Discussion Mining Sub -Phase 1A; and an Interim Use Permit for Aggregate Processing PREPARED BY: Eric Zweber, Senior Planner AGENDA NO. 6.a. ATTACHMENTS: Location Map; Large Scale Mineral Extraction Permit Application; Annual Operating Permit Application; Aggregate Processing Interim Use Permit Application; Groundwater Monitoring Plan; Spill Prevention, Control and Countermeasures Plan; Environmental Contingency Plan; Department of Health Letter dated April 2; Department of Health Letter dated July APPROVED BY: 25; LBG Memorandum dated July 28; Dakota County Letter dated July 30; Barr Engineering Response Letter to the Department of Health dated August 21; LBG Response Memorandum dated August 22; Dakota Aggregates Response Letter dated August 22; City Engineer's Memorandum dated August 22; Letters from Residents RECOMMENDED ACTION: Open Public Hearing and receive Public Comments. Continue Public Hearing to September 25. ISSUE In May, the City approved an Ordinance to permit large scale mineral extraction as an interim use in the AG: Agricultural zoning district. The Ordinance included requirements that the operator would need to receive an interim use permit (IUP) for the overall multi -year mining proposal, receive an annual operating permit for mining that would be conducted in the following calendar year, and receive a separate IUP for any ancillary use (such as aggregate processing, concrete production, or asphalt production) included in the plan. On June 28, Dakota Aggregates submitted an application for large scale mineral extraction permit for the forty year mining operation, an annual operation permit for dry /wet mining sub -phase 1A, and an IUP for the aggregate processing. Dakota Aggregates, as this time, has not requested an IUP for any additional ancillary uses, such as the concrete or asphalt production. It is anticipated that Dakota Aggregates will apply for at least one IUP for concrete production this fall or winter. The objective of the Planning Commission meeting is to have the staff review the mining proposal; open the Public Hearing and receive public comment; have the Planning Commissioners provide their questions and comments regarding the proposal; and continue the public hearing to the September 25 regular Planning Commission meeting. The Planning Commission will conduct a work session on September 11 to review the public and Planning Commissioner's comments and discuss possible permit conditions to address the comments. It is anticipated that Staff will prepare a formal recommendation and permit conditions for the September 25 regular Planning Commission meeting, depending upon the outcome of the meetings on the 28 and 11th. SUMMARY Large Scale Mineral Extraction Permit Dakota Aggregates has requested a large scale mineral extraction (LSME) permit for approximately 890 acres of land generally located south of County Road 42, north of County Road 46, east of Biscayne Avenue and west of Akron Avenue. Of the 890 acres, the northern 130 acres (colored green on the phasing plan) will not be mined and will be maintained as farmland (until development occurs) to buffer the Bloomfield and Enclave neighborhoods to the north. The southeastern 170 acres, named the Ancillary Use Facility (colored purple on the phasing plan), will not be mined and is intended to house various ancillary uses including aggregate processing, concrete and asphalt production, a vehicle maintenance facility, and a concrete product casting yard. The remaining 590 acres located east of Biscayne Avenue and north of County Road 46 are proposed to be mined over the next 25 years. There are additional plans for aggregate mining south of County Road 46 for an additional 15 years, but that land is located within Empire Township and is not part of this application. The ancillary uses, which support the 25 years of mining in Rosemount and 15 years of mining in Empire Township, would occur over the 40 -year mining project. The 590 acres of active mining proposed in Rosemount are divided into three areas. The northern 170 acres, named the North Dry Mining area (colored tan on the phasing plan) generally located north of the future extension of Boulder Trail, will be mined within the first 15 years of operation. The southwestern 185 acres, named the Dry/Wet Mining area (colored blue on the phasing plan), is proposed to occur for 25 years and will be the only area within Rosemount where mining activity could occur in the groundwater. The east central 235 acres, named the South Dry Mining area (colored yellow on the phasing plan), would be mined in years 16 through 25 of the permit and mining would only be allowed after the North Dry Mining area has been reclaimed. Annual Operating Permit and Interim Use Permit for Ancillary Uses In addition to the LSME permit, Dakota Aggregates has applied for an annual operating permit to mine Dry/Wet Sub -Phase 1A in 2013 and an IUP for the aggregate processing operation at the Ancillary Use Facility (AUF). Sub -Phase 1A is approximately 25 acres of land located northwest of the Station Trail /County Road 46 intersection. The IUP for the aggregate processing affects approximately 70 acres of land located north and east of the Station Trail and County Road 46 intersection. The designated aggregate processing area includes a 13 -acre stand of trees located directly north of County Road 46. This area is to remain undisturbed to provide a buffer to the aggregate processing use. The remaining acreage is devoted to ancillary uses: 45 acres for aggregate processing including washing, screening, and stockpiling of material being mined; and 13 acres used for stockpiling, crushing, and screening used concrete and asphalt into recycled aggregate products (RAP). Dakota Aggregates has applied for an access permit from Dakota County for the intersection of Station Trail and County Road 46. North Dry Mining Area The 170 acre North Dry Mining area is roughly a rectangle; 2,000 feet north -to -south and 5,000 feet east to- west. The North Dry Mining area is located south of the Mining Buffer area about a quarter mile south of County Road 42, about a half a mile west of Akron Avenue, north of the South Dry Mining area about a mile north of County Road 46, and directly east of Biscayne Avenue. The North Dry Mining area is divided into seven phases, Dry Mining Phases 1 through 7. Phase 1 and 2 occupy the north 1,200 feet of the North Dry Mining area, while phases 3 through 7 run consecutively from the east to the west. Dakota Aggregates has committed to completing the mining of the North Dry Mining area within 15 years of the issuance of the LSME permit. Accesses for the North Dry Mining are proposed to be Akron Avenue at County Road 42 and Biscayne Avenue at Boulder Trail. The first phases will use an internal haul road constructed along the former rail line about a quarter mile south of County Road 42 to Akron Avenue, then north on Akron Avenue to 2 County Road 42. Dakota Aggregates has estimated that the mining of Dry Mining Phases 1 through 4 would occur from 2014 through 2023. Dakota Aggregates is requesting an access to Biscayne Avenue at Boulder Trail for the final phases of the North Dry Mining area. Dakota Aggregates has estimated that the mining of Dry Mining Phases 5 through 7 would occur from 2023 through 2028. Staff would recommend that the mining in Dry Mining Phases 1 through 7 be completed by 2027 to comply with the 15 year mining timeline. Truck traffic using the Boulder Trail access will head north on Biscayne Avenue to the intersection with Biscayne Avenue. Staff is working on an agreement with Dakota Aggregates and the University of Minnesota that requires their financial contribution to a future traffic signal at Biscayne Avenue and County Road 42 and the future improvement of Biscayne Avenue from Boulder Trail to County Road 46. It is anticipated that the agreement would be a condition of mining approval. Once the North Dry Mining area is completed and reclaimed, all other access to the LSME would occur onto County Road 46. Screening and berming from the North Dry Mining area to the northern residences will be accomplished by maintaining the existing tree line and installing a berm west from the tree line to Biscayne Avenue. Similarly a berm will also be extended along the east side of Biscayne Avenue to the Boulder Trail access. The berms will be installed as the annual operating permits for Dry Mining Phases 1 through 7 are issued. It is intended that the berms will be put in place prior to commencement of mining adjacent to the berms. Dakota Aggregates has not applied to mine in these areas during 2013 as they are all future phases. Dakota Aggregates has provided an end use grading plan that provides a maximum of 5% grade along the northern and eastern edge of the North Dry Mining area and the grading of the future Boulder Trail corridor that would meet a 40 mph design speed. Reclamation of the mining areas would require compliance with this end use plan unless a revision is expressly approved by the Council in the future. Dry /Wet Mining Area The 185 acre Dry /Wet Mining area is roughly triangular in shape and runs about 4,000 feet west to east along County Road 46 and about 3,500 feet north to south along Biscayne Avenue. The Dry /Wet Mining area is divided into five phases. Phases 1 through 4 run east to west along County Road 46 from Station Trail to Biscayne Avenue and Phase 5, the final phase, is along Biscayne Avenue running north to the future Boulder Trail access. These five phases are the only areas within the LSME permit that anticipate mining within the groundwater. Reclamation of the area will result in a lake to the northeast of the intersection of County Road 46 and Biscayne Avenue. The mining of the Dry /Wet Mining area is projected to take 25 years. The access to the Dry /Wet Mining Area will be from the intersection of Station Trail and County Road 46. Dakota Aggregates is working with Dakota County to determine improvements needed to the intersection to accommodate the mining access. The material mined from the Dry /Wet Mining area will be either trucked or conveyored to the aggregate processing area within the AUF during the dry mining activity (above the groundwater). Once the material within Dry /Wet Mining Phases 1 and 2 have been mined within two vertical feet of the groundwater, a barge will be installed into the lake with a clamshell or dragline bucket on a crane. From the crane, the mined material will be conveyored to the aggregate processing area. From the aggregate processing area, the mined material will either be expended with approved AUF uses or transported by truck using the Station Trail and County Road 46 intersection. The screening for the Dry /Wet Mining area will be a landscaped berm constructed along the north side of County Road 46 and the east side of Biscayne Avenue. The berming will be installed along with the annual operating permit for the individual phases and Dakota Aggregates has applied for an annual operating permit for Phase 1 in 2013. The end use grading plan proposed for the Dry /Wet Mining area includes a 2 to 1 slope adjacent to the Biscayne Avenue and County Road 46 right -of -ways to the lake edge with a 60 foot wide, 10 to 1 sloped bench at the waterline. 3 South Dry Mining Area The 235 acre South Dry Mining area is roughly rectangular in shape, located south of the North Dry Mining area, about a half mile west of Akron Avenue, north of the AUF, and northeast of the Dry /Wet Mining area. The South Dry Mining area is divided into four phases labeled Dry Mining Phase 8 through 11. The material mined from the South Dry Mining will be trucked or conveyored to the aggregate processing area within the AUF. From the aggregate processing area, the material would either be used in the uses located within the AUF or trucked using the access at Station Trail and County Road 46. The South Dry Mining area is proposed to occur in years 16 through 25 of the LSME permit. Screening of the South Dry Mining area is by a landscaped berm along the south side of the future Boulder Trail. Dakota Aggregates has not proposed berming along the east side of the South Dry Mining area. Staff would anticipate that UMore will be developing within 15 years and would recommend landscaped berms be added to the east side of the South Dry Mining area. Dakota Aggregates has not provided an end use grading plan for the South Dry Mining area to the northeast of the lake. That end use grading plan will need to be approved before any annual operating permit can be issued in the South Dry Mining area. Ancillary Use Facility The 170 acre AUF is roughly triangular in shape and is located directly north of County Road 46 from Station Trail on the west to Akron Avenue on the east. The AUF would contain 45 acres of aggregate processing, 20 acres of asphalt production, 12 acres for a concrete product casting yard, 30 acres of concrete production, 8 acres for a vehicle and equipment facility, 5 acres for an office, 10 acres of ponding, 13 acres of recycled aggregate products (RAP), and 30 acres of existing trees that will be maintained. The accesses for the AUF are proposed to be Station Trail at County Road 46 and Akron Avenue at County Road 46. There will be no mining of aggregate material within the AUF and the grading will be limited to leveling the property for the AUF use and the installation of berming and ponding. The site will be graded with a slope to the east, with an elevation of 950 feet on the boundary of the Dry /Wet Mining area to an elevation of the 940 feet at the east side of the casting yard and the north side of the asphalt plant. In the northeast corner of the AUF is a stormwater pond that will provide stormwater treatment for the entire AUF. The emergency overflow for the pond is at the access road with Akron Avenue to the east and into a drainage basin that eventually leads to the wetland south of the Dakota County Technical College driving course. No stormwater from the AUF would be directed to the new groundwater fed lake. The AUF sites are proposed to be surfaced with compacted Class 5 aggregate. The LSME Ordinance regulates the construction and design of the Concrete Processing, Asphalt Processing, and the Vehicle Maintenance Facility using the GI: General Industrial zoning standards. If the Casting Yard exists longer than 10 years, then the Casting Yard would need to meet the GI: General Industrial zoning standards as well. To meet the GI: General Industrial zoning standards, staff recommends that any path that a road licensed vehicle would use to access the Concrete Processing, Asphalt Processing, and the Vehicle Maintenance Facility must be paved and curbed per the City Code. Additionally, staff recommends that the Casting Yard cease operation by December 31, 2022. Dakota County has completed a trunk transportation study for the UMore property and the surrounding area. One of the recommendations is modifying the future alignment of Akron Avenue so that it travels through roughly the middle of the AUF site to connect with the County Road 42 and Akron Avenue intersection to the north and connect to Biscayne Avenue within Empire Township to the south. The AUF plan permits the future Akron Avenue extension through the AUF at a 55 mph design speed and also can accommodate future berming along Akron Avenue. The aggregate processing, office, and RAP will be located west of the future Akron Avenue and the asphalt production, casting yard, concrete production, and maintenance facility would be located east of the future Akron Avenue. 4 Dakota Aggregates has applied for an IUP for the aggregate processing and RAP facilities using the access at Station Trail and County Road 46. No berming is proposed for the aggregate processing and RAP and site activity screening is proposed through maintaining 13 acres of existing trees on the north side of County Road 46, located east of Station Trail. All the other AUF uses will need to apply for separate IUP permits before those uses be installed and begin operation. It is anticipated that Dakota Aggregates will request the concrete production IUP later this fall or summer. Annual Operating Permit Dakota Aggregates has applied for an annual operating permit that would allow the mining of 25.32 acres of Dry /Wet Mining Sub -Phase 1A. The access for Sub -Phase 1A would be the Station Trail intersection with County Road 46. Dakota Aggregates is working with Dakota County to permit and construct the improvements to Station Trail and County Road 46. Berming and landscaping will be constructed on the north side of the County Road 46 for at least 1,100 feet west of Station Trail. Additional berming to the west may be constructed based on the depth of the topsoil within Sub -Phase 1A. The mining of Sub -Phase 1A will be conducted by scrappers and front -end loaders to a depth within two vertical feet of the groundwater. The dry mining within two feet of groundwater would continue in future annual operating permits into Sub Phases 1B, 2A, and 2B which would result in about 80 acres of mining area. Following the mining of the dry material from Dry /Wet Mining Phases 1 and 2, gravel deposits within the groundwater will be mined using a crane on a barge located on the lake that is created. The material mining from Sub -Phase 1A will be trucked or conveyored to the aggregate processing facility to the east. The mining proposed within Sub -Phase 1A would remove material about 140 feet in depth at final reclamation. The reclamation of the south side would be 2 to 1 slope adjacent to the County Road 46 right -of -way and the reclamation of the east side would be a 3 to 1 slope up to the aggregate processing area. The north and west sides of Sub -Phase 1A will be the continuation of the groundwater feed lake. Hydrogeologic Study and Water Monitoring Plan Barr Engineering has prepared a Hydrogeological Study and Water Monitoring Plan for the LSME permit. The hydrogeological study portion of the report is similar to the study conducted for the gravel environmental impact statement (EIS), but the water monitoring plan is substantially different as compared to the EIS. The hydrogeologic study shows that the groundwater generally flows from the southwest to the northeast towards the Mississippi River, but the study also shows a deposit of lower permeable till located under the AUF which either directs the groundwater to the north around the till or down below the till to a higher permeable layer outwash above the bedrock. This groundwater flow pattern along with the creation of the lake that is connected with the groundwater affects the design of the groundwater monitoring plan. The water monitoring plan has changed from the measures described in the EIS. One of the major factors that affected the Plan is proposed additions to the City well system based on the expectation of UMore development. First, low yield City wells RR -1 and RR -2 are replaced by a high yield Well 17 near the former Rosemount Town Hall site north of DCTC. Second, Well 18 was added in a location east of Akron Avenue and the City UMore ball fields. These two changes change the groundwater flow patterns and therefore prompt changes to the groundwater monitoring plan. To address these changes, Barr has proposed a series of four monitoring wells about 2,000 feet northeast of the future lake shoreline. These wells would monitor the groundwater within the outwash that is fed from the lake. Staff is concerned that the 4 monitoring wells would not monitor the impacts from the northeast shore of the lake that flows into the Jordan aquifer, projected to occur in a relatively short horizontal distance from shoreline. Staff recommends a monitoring well within Dry Mining Sub -Phase 9A that would monitor the outwash aquifer before the groundwater would enter the Prairie du Chien and into the Jordan aquifer which will serve proposed City Well 16. 5 Dave Hume, the City's groundwater consultant from Leggette, Bashears Graham (LBG), had prepared a memorandum dated July 28 (attached to this Executive Summary) that details the City's concerns and requests. City staff met with Dakota Aggregates and Barr Engineering on August 8 and August 10 to review the LBG memorandum, review the Barr groundwater model, and discuss revisions necessary to address the City's concerns. Barr and Dakota Aggregates have prepared a response letter (dated August 22 and attached to this Executive Summary) outlining specific the changes they will make to the Groundwater Monitoring Plan, but the revised Plan was not available for tonight's meeting. The revised Groundwater Plan will be provided and reviewed in detail during the September 11 Planning Commission Work Session. Environmental Contingency Plan; Barr Engineering has prepared an Environmental Contingency Plan (ECP) to evaluate the possibility of contaminants being released due to the mining operations. The Minnesota Pollution Control Agency (PCA) will need to review and approve the ECP and staff has prepared a potential condition that would require the PCA approve the ECP before any grading or mining would be allowed. Additionally, staff anticipates a condition requiring the immediate notification of Rosemount and Dakota County Environmental Management staff upon the discovery of any contaminant or hazardous material. Spill Prevention, Control, and Countermeasures Plan; Dakota Aggregates has prepared a Spill Prevention, Control, and Countermeasures (SPCC) plan. The SPCC includes the description of all petroleum products and fuel storage tanks within the mining operation. All fuel storage tanks and asphalt tanks will include secondary containment. Additionally, all fuel and asphalt storage in the AUF has a third line of defense that any spill that escapes the secondary containment would be contained in the stormwater pond to the northeast and the outlet from the pond can be blocked until the spill has been cleaned up. The SPCC also includes security measures, inspection logs and training forms that would be completed by the employee. City staff would be able to inspect these items to ensure that they are in compliance with the SPCC. Stormwater Pollution and Prevention Plan The mining phases do not result in any additional impervious surface and therefore does not include any specific stormwater infrastructure. The AUF is designed to be graded from west to east with a ten foot elevation drop across the AUF. A stormwater pond is design in the northeast corner of the AUF. Staff is supportive of this design because it directs all stormwater from the AUF to the east and away from the future lake. The City Engineer has prepared a memorandum (dated August 22 and attached to this Executive Summary) that contains specific comments regarding the stormwater management design. The major comments include providing the stormwater model to ensure the AUF pond design meets City standards, accommodation of the off -site stormwater overflow per the City's Stormwater Management Plan, and ensuring that the perimeter berming does not interfere with the adjacent roadway drainage. There appears to be eight wetlands that will be impacted by the minin proposal. Dakota Aggregates will need to submit and receive approval of a wetland conservation act permit and a wetland mitigation plan in compliance with the City's Wetland Management Plan before an annual operating permit can be issued for any mining phase containing a wetland. Minnesota Department of Health The Minnesota Department of Health (MDH) has submitted two letters regarding the mining proposal and its potential effect on the City's drinking water supply management area (DWSMA). Both letters are attached to this Executive Summary. The first letter, dated April 2, provided the MDH guidance on wellhead protection related to mining activities, discussed the high aquifer vulnerability, and states that all unconsolidated material above the Prairie du Chien will be removed. The second letter, dated July 25, 6 states that the creation of the groundwater feed lake within a high vulnerability area may result in the MDH determining that the City's wells being under the direct influence of surface water. To discuss these letters, City staff met with MDH staff on August 14. The discussion regarding the first letter including the clarification that the mining area has areas that are defined as high, moderate, and low vulnerability and that there is 15 feet of unconsolidated material that will remain over the Prairie de Chien. MDH staff stated that they believe the DWSMA guidance should be applied to the entire mining site and that the groundwater travel from the bottom of the lake should be modeled. City staff explained that both of these issues were raised to Dakota Aggregate in the City's July 28 memorandum and will be included in the revised Groundwater Monitoring Plan. As follow up to this letter, City staff has requested that the MDH letter be revised to accurately describe the various vulnerability designations and correctly state that 15 feet of unconsolidated material will remain. Additionally, Barr Engineering has prepared a response letter (dated August 21 and attached to this Executive Summary) that describes the design of the AUF over the low vulnerability area and the use of the MDH guidance. The discussion regarding the second letter included how MDH would determine if the City's well, and therefore public drinking water, were under the direct influence of surface water from the newly created groundwater lake. MDH staff indicated that water would be tested to determine if there was biological material, such as insects and bacteria, present. Additionally, MDH stated that if the groundwater was not under direct influence, there may still be some impacts on the chemical concentration of the groundwater, such as pH or iron levels. LBG, the City's groundwater consultant, prepared a response letter (dated August 22 and attached to this Executive Summary) to describe the testing and analysis needed to determine groundwater under the direct influence of surface water. The letter describes that biological material is substantially reduced after traveling 200 feet through sand and gravel and is uncommon in wells greater than 200 feet in depth. The future City Well 18 (the closest well to the lake) is 6,000 horizontal and 250 vertical feet from the lake. Staff has requested that MDH staff review this analysis and state if they concur with this analysis. Joy Loughry, MDH hydrogeologist, will attend the August 28 Planning Commission meeting and be available to answer any questions that the Planning Commissioners may have regarding the MDH letters. Dakota County Dakota County staff has reviewed the Dakota Aggregates proposal and has submitted a comment letter dated July 30. The comment letter is attached to this Executive Summary. The subjects addressed within the letter include that the operation must comply with Dakota County Ordinances No. 110 and 111; mining below the water table may affect the drinking water aquifer including the issue raised by the MDH; being under the direct influence of surface water; collect and evaluate additional information regarding fracture flow within the Prairie du Chien; verify the model; additional sampling of the monitoring wells; more monitoring wells; information on specific types and areas of contaminants; specific concerns regarding the AUF and vehicle maintenance; and security concerns. Dakota Aggregates has prepared a response letter to the County concerns which is attached to this Executive Summary. Dakota Aggregates and City staff concurs with the majority of the concerns raised in the County letter. The LSME Ordinance and any future permit will require that the mining operation comply with Dakota County Ordinances No. 110 and 111 as well as all other federal, state, and local regulations. City staff has reviewed the model used by Barr Engineering and Barr has confirmed that the model includes the MDH guidance from fracture flow. The MDH indicated that their guidance provides a conservative approach to modeling which is desired in this instance. The vehicle maintenance facility at the AUF will be required to be paved per City Code and the stormwater design for the AUF directs runoff east away from the lake. 7 The information regarding the types and areas of contaminant concerns will be forwarded to the PCA for their use during ECP review and approval. City staff has requested that Barr add additional language to the Plan to identify that additional monitoring wells or more frequent monitoring will be required as a result of a spill or contaminant detection. City staff reviewed the County request for additional groundwater information with LBG, our groundwater consultant, and MDH staff. LBG prepared analysis of the regulations covering groundwater under direct influence of surface water and determined that it is unlikely that a well 6,000 vertical feet and 250 vertical feet would qualify for direct influence. More discussion of this analysis is in the MDH section above and the LBG response letter attached to the Executive Summary. Additionally, the City discussed the MDH guidance on fracture flow with MDH staff and confirmed with Barr that they included this guidance in their modeling. MDH staff indicated that the additional data collect that the County requests is unlikely to produce a better understanding of fracture flow beyond that included in the MDH guidance. City staff is working with Barr to include a fifth down gradient monitoring well to detect any plume of contaminants from the lake. LBG staff believes placing the monitoring wells closer to the lake would be less effective and could result in missing a contamination plume. City staff, based on the consultation with LBG and MDH staff, does not recommend inclusion of the additional testing and monitoring recommended by Dakota County. Potential Permit Conditions Staff recommends that the Planning Commission continue the Public Hearing to the September 25 regular meeting. While the Planning Commission is not expected to provide a formal recommendation tonight, staff has provided the following draft permit conditions to address the issued discussed in this Executive Summary: 1. Mining in Dry Mining Phases 1 through 7 may not occur beyond 2027. Reclamation of Dry Mining Phases 1 through 7 must be completed by December 31, 2027. 2. Execution of an Public Improvement Agreement with Dakota Aggregates and the University of Minnesota that includes a 50% contribution to the stoplight installation at Biscayne Avenue and County Road 42 if Dakota Aggregates uses the Boulder Trail access; a 25% contribution to the stoplight installation at Biscayne Avenue and County Road 42 if Dakota Aggregates does not use the Boulder Trail access; and a 50% contribution to the improvement of Biscayne Avenue from Boulder Trail to County Road 46. 3. A City Grading Permit is required for the construction of the haul route from Dry Mining Phase 1 to Akron Avenue. 4. Access permits are required for any access route connection to a public roadway from the jurisdictional agency in control of the public roadway. 5. Engineered designs for any reclamation steeper than a 3 to 1 slope must be submitted and approved before the reclamation can occur. 6. Berming and landscaping will be required on the east boundary of Dry Mining Sub Phases 10B, 11A, and 11B; and required on the north boundary of Dry Mining Sub -Phase 11B. 7. The End Use Grading Plans for Dry Mining Sub Phases 5B and 6B and Dry Mining Phases 8 through 11 shall be submitted and approved before the Annual Operating Permit would be issued for those phases and sub phases. 8. A gate and 30 feet of fencing on each side of the gate shall be installed at the entrance of each access route. The gate shall be closed and locked when the mining is not operating. A knox box or similar devise shall be installed to provide emergency personal access to the key for the lock. 9. Provide an End Use Grading Plan for the Ancillary Use Facility (AUF) area. 10. The path of any road licensed vehicles using the Concrete Processing, Asphalt Processing, and Vehicle Maintenance Facility shall be paved with curbing per the City Code. 8 11. The Casting Yard may not operate beyond December 31, 2022. 12. Conformance with the City Engineer's Memorandum dated August 22. 13. The Environmental Contingency Plan must receive Minnesota Pollution Control Agency approval before any grading or mining can occur. 14. Add the City of Rosemount and Dakota County Environmental Management to the immediate contact list if containments or hazardous materials are discovered. 15. A wetland conservation act permit and wetland mitigation plan must be approved before an annual operating permit can be issued for any phase with a wetland. 16. Compliance with Dakota County Ordinances No. 110 and 111, as well as all other applicable Federal, Minnesota, Dakota County, and Rosemount regulations. Tentative Schedule At the July 24 work session, staff review Dakota Aggregates' proposal and Dave Hume, the City's groundwater consultant, provided a presentation regarding the groundwater monitoring plan. Tonight, staff will review the staff report; the Planning Commission will open the public hearing and receive comment from the public; Planning Commissioners will provide their questions and comments regarding the proposal; and continue the public hearing to the September 25 meeting. On September 11, the Planning Commission will conduct a work session to review the issues and comments received and discuss permit conditions to address those concerns. On September 25, staff will review the recommended permit conditions and the Planning Commission will re -open the public hearing. If issues and concerns of the majority of the Planning Commissioners have been addressed, staff will ask the Planning Commission to close the public hearing and provide a recommendation to the City Council. If a majority of the Planning Commissioners has not had their issues and concerns addressed, then another meeting would be scheduled. Following a Planning Commission recommendation, the City Council will review the application during a work session to discuss the public comments received and the review the Planning Commission recommendation. At a regular meeting following the work session, the City Council will take formal action on the application. Date Group Meeting Type Topic July 24 Planning Commission Work Session Introduction to the Proposal August 28 Planning Commission Public Hearing Gather Public and Planning Commission Comments September 11 Planning Commission Work Session Address Comments Received and Discuss Possible Permit Conditions September 25 Planning Commission Public Hearing Continue Public Hearing and Review Staff Recommendation Second Wednesday Review Planning Commission of the following City Council Work Session Recommendation and Comments month Received Third Tuesday of Review and Consider Approval of the the following City Council Formal Action month Mining Proposal RECOMMENDATION Open the Public Hearing and receive public comment. Continue the Public Hearing until the September 25 regular Planning Commission meeting. 9 Dakota Aggregates a r0 s .ti i f I-1 S•1 ran i i raw 7 +,:"4 I IOC \I 1 4 411,0,:" l i M'i .v q r 4 j lfp�o• j clis it f ij E111' 'L r,. i III 1 'goings, +31 .1, 0 lash fi •S'a 111 IF. v=tir I :Et. girip• ,t 1 -i 1431111 11 I I In ,0- a r i iw PM 1 y .;s�! a,, E ti n u 4' 4 gar A r 1 I Cr. r �4 f t a,g 1 t i i i 'ai'1 LA2(Ae SCA 1 /h(AG 2A-i_ Cx l+e4CYtOi I I mac, iI 1 'l 1 Disclaimer. Map and parcel data are believed to be accurate, but accuracy is not Map Scale guaranteed. This is not a legal document and should not be substituted for a title search, 1 inch 1600 feet appraisal, survey, or for zoning verification. UMore Park Large Scale Non Metallic Mineral Extraction UMore Park City of Rosemount June 26, 2012 1. Legal Description of the Land upon which Excavation is Proposed: That part South Half of Section 28, Township 115, Range 19, Dakota County, Minnesota, lying westerly of the following described line; Commencing at the northeast corner of the Southeast Quarter of said Section 28; thence South 89 degrees 48 minutes 43 seconds West, assumed bearing along the north line of said Southeast Quarter, a distance of 1058.90 feet to the point of beginning of the line to be described; thence South 18 degrees 23 minutes 48 seconds West a distance 1211.64 feet; thence South 07 degrees 11 minutes 26 seconds East a distance of 1472.46 feet; thence South 75 degrees 07 minutes 52 seconds East a distance of 126.03 feet to the south line of said Southeast Quarter and there terminating. EXCEPT the plat of UNIVERSITY ADDITION, said Dakota County. AND Section 33, Township 115, Range 19, Dakota County, Minnesota; EXCEPT the East 133.00 feet of the North 549.43 feet of the Southeast Quarter of said Section 33; EXCEPT the East 133.00 feet of the South 930.25 feet of the Northeast Quarter of said Section 33; also EXCEPT that part of said Northeast Quarter described as follows: Beginning at the northeast corner of said Northeast Quarter; thence South 00 degrees 11 minutes 58 seconds West, assumed bearing along the East line of said Northwest Quarter, a distance of 800.63 feet; thence North 81 degrees 23 minutes 25 seconds West a distance of 40.76 feet; thence North 38 degrees 17 minutes 54 seconds West a distance of 819.06 feet; thence North 75 degrees 07 minutes 52 seconds West a distance of 580.25 feet to the north line of said Northwest Quarter; thence North 89 degrees 51 seconds 14 seconds East, along said north line, a distance of 1111.53 feet to the point of beginning. AND That part of the Northwest Quarter of Section 34, Township 115, Range 19, Dakota County, Minnesota, described as follows: Commencing at the northwest corner of said Northwest Quarter; thence South 00 degrees 11 minutes 58 seconds West, assumed bearing along the west line of said Northwest Quarter, a distance of 800.63 feet to the point of beginning of the land to be described; thence continuing South 00 degrees 11 minutes 58 seconds West, along said west line, a distance of 912.75 feet; thence North 89 degrees 51 minutes 14 seconds East a distance of 647.18 feet; thence North 00 degrees 11 minutes 58 seconds East a distance of 813.16 feet; thence North 81 degrees 23 minutes 25 seconds West a distance of 654.21 feet to the point of beginning. AND That part of the Southwest Quarter of Section 34, Township 115, Range 19, Dakota County, Minnesota, lying southerly of the following described line: 1 Commencing at the northwest corner of said Southwest Quarter; thence South 00 degrees 11 minutes 58 seconds West, assumed bearing along the west line of said Southwest Quarter, a distance of 549.45 feet to the point of beginning of the line to be described; thence South 89 degrees 28 minutes 53 seconds East a distance of 2646.92 feet to the east line of said Southwest Quarter and there terminating And lying westerly, northwesterly and northerly of the following described line: Commencing at the southwest corner of said Southwest Quarter; thence South 89 degrees 42 minutes 10 seconds East, along the south line of said Southwest Quarter, a distance of 2192.17 feet to the point of beginning of the line to be described; thence North 04 degrees 21 seconds 18 seconds East a distance of 142.12 feet; thence North 01 degrees 12 minutes 32 seconds West a distance of 368.88 feet; thence North 01 degrees 58 minutes 09 seconds West a distance of 266.72 feet; thence northeasterly 194.60 feet, along tangential curve, concave to the southeast, having a central angle of 96 degrees 57 minutes 13 seconds and a radius of 115.00 feet; thence South 85 degrees 00 minutes 56 seconds East, tangent to last described curve, a distance of 157.25 feet; thence easterly 99.70 feet, along a tangential curve, concave to the north, having a central angle of 09 degrees 25 minutes 45 seconds and a radius of 605.84 feet; thence northeasterly 100.73 feet, along a reverse curve, concave to the northwest, having a central angle of 56 degrees 01 minutes 50 seconds and a radius of 103.00 feet to the west line of said Southwest Quarter and said line there terminating. 2. Ancillary Use Facility Legal Description That part of the Southwest Quarter of Section 34 and the Southeast Quarter of Section 33, all in Township 115, Range 19, Dakota County, Minnesota, described as follows: Beginning at the southwest corner of said Southwest Quarter of Section 34; thence South 89 degrees 42 minutes 10 seconds East, assumed bearing along the south line of said Southwest Quarter of Section 34, a distance of 2192.17 feet; thence North 04 degrees 21 minutes 18 seconds East a distance of 142.12 feet; thence North 01 degrees 12 minutes 32 seconds West a distance of 368.88 feet; thence North 01 degrees 58 minutes 09 seconds West a distance of 266.72 feet; thence northeasterly 112.50 feet, along a tangential curve, concave to the southeast, having a central angle of 56 degrees 02 minutes 58 seconds and a radius of 115.00 feet; thence northerly 56.43 feet, along a non tangential curve, concave to the east, having a central angle of 35 degrees 55 minutes 23 seconds, a radius of 90.00 feet and a chord which bears North 17 degrees 26 minutes 35 seconds West; thence North 00 degrees 31 minutes 07 seconds East, tangent to last described curve, a distance of 206.76 feet; thence northerly 83.26 feet, along a tangential curve, concave to the west, having a central angle of 34 degrees 04 minutes 23 seconds and a radius of 140.00 feet; thence North 56 degrees 26 minutes 44 seconds East a distance of 45.08 feet; thence North 00 degrees 31 minutes 07 seconds East a distance of 299.38 feet; thence North 88 degrees 50 minutes 09 seconds West a distance of 537.90 feet; thence North 01 degrees 06 minutes 55 seconds East a distance of 542.56 feet to the following described line; Commencing at the northwest corner of said Southwest Quarter of Section 34; thence South 00 degrees 11 minutes 58 seconds West, along the west line of said Southwest Quarter of Section 34, a distance of 549.45 feet to the point of beginning of the line to be described; thence South 89 degrees 28 minutes 53 seconds East a distance of 2646.92 feet to the east line of said Southwest Quarter of Section 34 and there terminating. 2 thence North 89 degrees 28 minutes 53 seconds West, along said described line, a distance of 1701.18 feet to said west line of the Southwest Quarter of Section 34; thence South 89 degrees 42 minutes 48 seconds West a distance of 133.00 feet; thence North 89 degrees 25 minutes 32 seconds West a distance of 1911.08 feet; thence South 00 degrees 00 minutes 00 seconds West a distance of 6.69 feet; thence South 24 degrees 59 minutes 14 seconds East a distance of 32.37 feet; thence South 38 degrees 36 minutes 54 seconds East a distance of 58.76 feet; thence South 24 degrees 49 minutes 30 seconds East a distance of 21.39 feet; thence South 08 degrees 35 minutes 01 seconds East a distance of 17.27 feet; thence South 01 degrees 13 minutes 27 seconds East a distance of 55.61 feet; thence South 20 degrees 01 minutes 53 seconds East a distance of 40.77 feet; thence South 20 degrees 03 minutes 43 seconds East a distance of 111.64 feet; thence South 15 degrees 03 minutes 51 seconds East a distance of 118.93 feet; thence South 27 degrees 25 minutes 38 seconds East a distance of 247.59 feet; thence South 21 degrees 09 minutes 19 seconds East a distance of 78.57 feet; thence South 18 degrees 19 minutes 12 seconds East a distance of 190.08 feet; thence South 26 degrees 25 minutes 05 seconds East a distance of 227.06 feet; thence South 46 degrees 46 minutes 51 seconds East a distance of 98.15 feet; thence South 33 degrees 47 minutes 16 seconds East a distance of 171.67 feet; thence South 23 degrees 42 minutes 30 seconds East a distance of 90.20 feet; thence South 17 degrees 56 minutes 04 seconds East a distance of 178.92 feet; thence South 17 degrees 54 minutes 28 seconds East a distance of 132.38 feet; thence South 25 degrees 39 minutes 33 seconds East a distance of 126.20 feet; thence South 30 degrees 29 minutes 59 seconds East a distance of 103.92 feet; thence South 28 degrees 45 minutes 36 seconds East a distance of 250.67 feet to the south line of said Southeast Quarter of Section 33; thence North 89 degrees 34 minutes 22 seconds East, along said south line, a distance of 1060.22 feet to the point of beginning. EXCEPT that part lying southerly of north right of way line of County State Aid Highway No. 46 per DAKOTA COUNTY ROAD RIGHT OF WAY MAP NO. 253 and DAKOTA COUNTY ROAD RIGHT OF WAY MAP NO. 254, according to the recorded plats thereof, Dakota County, Minnesota. OVERALL GROSS AREA: 171.856 ACRES NET USABLE AREA: 100.30 ACRES 3. Land Owner: Regents of the University of Minnesota UMore Development LLC 230 McNamara Alumni Center 200 Oak Street S.E. Minneapolis, MN 55455 Applicant: Dakota Aggregates, LLC 2025 Centre Pointe Boulevard, Suite 300 Mendota Heights, MN 55120 (651) 688 -9292 3 Operator: Dakota Aggregates, LLC 2025 Centre Pointe Boulevard, Suite 300 Mendota Heights, MN 55120 (651) 688-9292 4. Names and Addresses of All Adjacent Landowners within 1/4 of a Mile Dakota Aggregates has submitted the names and addresses of all adjacent landowners within 1/4 mile of the mining site. (Provided by Dakota County Abstract and Title) 5. Existing land use designations on the subject property and zoned properties with in 1/4 mile: The existing land use within the proposed mining area is agricultural research. Residential zoning is present on the north side of County Road 42. Agricultural /Public Institutional uses are present to the south and to the east with the majority of this agricultural land being owned by the Regents of the University of Minnesota. Business and Industrial zoning lies to the west of the proposed mining site as well as Agricultural zoned land. Please refer to plan sheet 1.00 which displays all zoning classifications on the proposed mining site as well as the surrounding area zoning classifications. 6. Introduction and Purpose of the Proposed Excavation: Dakota Aggregates LLC (applicant /operator) is applying for a large scale nonmetallic mineral extraction permit on land within UMore Park which is located in the City of Rosemount. Dakota Aggregates LLC is proposing to operate the sand and gravel mining operation which will produce construction grade sand and gravel products. The mineral extraction and Ancillary Use Facilities are proposed on approximately 946 gross acres/ 682 net usable acres of land within the City of Rosemount which is owned by the Regents of the University of Minnesota. The proposed operation will include clearing and grubbing, relocation of surface soils and stockpiling of topsoil and other overburden material including clay for aggregate products and or pond /landfill lining, berm construction, mineral extraction, material transporting, material processing including crushing, screening, washing, asphalt production, concrete production, Recycled Aggregate Products (RAP) production, loading and transporting materials to and from the proposed extraction site, importation of clean compactable material for reclamation purposes and production of cast concrete products. It is estimated that approximately 35- 40 million tons of aggregate material (sand and gravel) will be sold over approximately 25 years. The quantity sold will be dependent upon the actual gravel deposit and the market demand for aggregate products. Extraction activities will reach approximately 75 feet below the natural water table in some areas of the Dry /Wet Mining phases. The mining process is mechanical and does not involve contact of groundwater with chemicals or pollutants that would degrade water quality. The materials extracted will consist of high quality granular and aggregate material (sand and gravel). Please refer to the Reclamation Interim and End Use and Erosion Sediment Control Plan sheets 3.00- 4.04 for proposed final interim and end use reclamation contours. Generally, there are 5 sectors within the UMore Mining Area which are displayed in the phasing plan: (Please refer to the Overall Site Information /Phasing Plan Sheet 1.01) 1. Mining Buffer 130 acres adjacent County Road 42 (depicted in green) 2. North Dry Mining Phases 1 -7 (North of future Boulder Trail depicted in brown) 3. South Dry Mining Phases 8 -11 (South of future Boulder Trail depicted yellow) 4. Dry /Wet Mining Phases 1 -5 (Depicted in blue) 4 5. Ancillary Use Facility (Depicted in Purple) A. Mining Buffer A mining buffer consisting of approximately 130 gross acres will exist on the northern portion of the North Dry Mining phases adjacent to County Road #42. No mining activities will take place within the mining buffer. A combination of existing trees and temporary berm construction along the northern boundary of the North Dry Mining phases will screen the mining activities from the residents located on the north side of County Road 42. Once mining activities have expired in the North Dry Mining phases, the berm along the south side of the mining buffer will be removed and another temporary berm will be constructed south of future Boulder Trail. B. North Dry Mining Phases 1 -7 Activities in the North Dry Mining phases will include relocation of surface soils, berm construction, crushing, mixing, screening, stockpiling, aggregate washing, loading, hauling and conveying of aggregate materials to the Ancillary Use Facility (AUF). Processing equipment will be portable in the North Dry Mining phases to allow for efficient relocation of the equipment as the mine face advances. North Dry Mining phases will be completed within 15 years from the commencement of mining in the North Dry Mining phases unless additional time is permitted by the City of Rosemount. C. South Dry Mining Phases 8 -11 Activities in the South Dry Mining phases will include stripping of surface soils, berm construction, crushing, mixing, screening, stockpiling, aggregate washing, loading, hauling and conveying of aggregate materials to the AUF. If utilized, processing equipment will be portable in the South Dry Mining phases to allow for efficient relocation of the equipment as the mine face advances. The South Dry Mining Phases will commence once North Dry Mining phase 7 is close to being mined out and or being reclaimed. D. Dry/Wet Mining Phases 1 -5 Activities in the Dry/Wet Mining phases will include relocation of surface soils, berm construction, crushing, mixing, screening, stockpiling, aggregate washing, dredging, loading, hauling and conveying of aggregate materials to the AUF. The extraction activities in the Dry/Wet Mining phases 1 A 2B will be consistent to those activities within the Dry Mining phases until excavation limits have approached the groundwater elevations. At the time which mining has approached the groundwater in the Dry/Wet Mining phaseslA -2B (approximately 80 acres), a dredge, draglines, backhoes, and other similar equipment will be utilized to extract the aggregate material which lies underneath the water in Dry/ Wet mining phases IAA -5BB. The side slopes in phases 1A -2B will be reclaimed as per the end use grading plan prior to commencement of mining activities in Dry/Wet Mining sub -phase 3A. For Dry/Wet mining phases lAA -5BB the future lake edge /side slopes will be reclaimed on a phase by phase basis or prior to the extraction operations advancing past 80 acres of open and un reclaimed mine area in Dry/Wet mining phases. E. Ancillary Use Facilities The 100 acre (Net useable) Ancillary Use Facility (AUF, or Facility) is depicted on the Site Operations plan Sheet 1.08. Ancillary operations will include aggregate production activities such as crushing, mixing, screening, washing, loading, stockpiling of aggregate materials, hauling, ready mixed concrete production, asphalt production, precast production, and RAP production. The Ancillary Use Facility is located along the far 5 southeastern portion of the mining area adjacent to CSAH #46, which is an area that will not be subject to mineral extraction /excavation. This area is underlain by dense glacial till which is an area of low aquifer vulnerability and provides a natural protective barrier to limit the migration of potential release into the groundwater. A maintenance facility and an office will be utilized within the AUF. The office will be utilized for administrative purposes and will be tied into the truck scaling operations. Fuel tanks will be stored within the Ancillary Use Facility in the fueling station as depicted on plan sheet 1.08. Prior to the maintenance facility and fueling station being permitted and constructed through an interim use permit, temporary fuel tanks will be proposed in other locations of the AUF and will be indicated in the interim use permit application(s). The fuel will be contained within double walled tanks, equipped with redundant spill control features such as level alarms and fueling area containment. The tanks and the fueling station will be routinely inspected and any problems will be addressed immediately upon discovery. Scale houses will be located within the AUF as well. Please refer to the Spill Prevention Control and Countermeasures Plan (SPCC) for greater detail pertaining to spill prevention. The casting yard which will be located in the Ancillary Use Facility, will be used for precast production of precast bridge beams and other precast products. Please refer to plan sheet 1.08. 7. List of vehicles and equipment to be used on site: Scrapers Gantry Cranes Backhoe Excavators Conveyors Motor Graders Haul Trucks Bulldozers Scales Loaders Scale Houses Water Truck Dredges Aggregate Screeners Crushing Plants Wash Plants Asphalt Plant Concrete Batch Plants Pre Cast Plant Fuel Trucks Fuel Tanks Maintenance Vehicles Storage Bins Ready Mixed Concrete Trucks 8. Other Required Operating Permits Various operating permits will be required in addition to the required City of Rosemount permit requirements. The following is a list of the permit requirements which will be required for the proposed pit to operate. State Disposal System Construction Sand and Gravel, Rock Quarrying and Hot Mix Asphalt Production Facilii MPCA/NPDES Permit (Including Storm Water Prevention Plan) MPCA /Air Emissions for Plant Operations/ Processing Equipment DNR Water Appropriations Permit Dakota County Existing Access Improvement Permits Dakota County Well Permits (Monitoring) Dakota County Well Permits (Washing) Dakota County Well Sealing Permits (On a cases by case basis if wells are sealed as mining progresses) 6 9. Estimated Time frame of Extraction Activities: It is estimated that the mineral extraction activities will be completed in 25 years from the commencement of mining; however, the actual life of the extraction facility will be determined by the present and future demand of the mined products. Proposed Extraction Start Date: May 1, 2013 contingent upon City of Rosemount permit approvals. Proposed Extraction End Date: 25 years from the commencement of mining activities Proposed Site Reclamation: It is estimated that interim reclamation activities will commence approximately within 18 -24 months after completion of mineral extraction of each phase or prior to advancing into more than 80 acres of open mine area/phasing in a contiguous minable phase. The internal haul road areas of future Boulder Trail and the internal haul roads to access the rail bed internal haul route for access to Akron Avenue /CSAH #42 in Dry Mining phases 1 -7 may need to remain open and un reclaimed in accordance with hauling activities to the Biscayne Avenue /County Road 42 and Akron Avenue/ County Road #42 accesses. If any portion of the North Dry Mining phases including future Boulder Trail and all other internal haul roads, is to be converted to urban density residential, commercial, or industrial land use, unless some other grading plan is approved by the City, that portion will be graded to the end use reclamation grades on or before 16 years after the effective date of the commencement of mining activities in the North Dry Mining phases. 10. Names of Highways, Streets, or other Public Roadways within the City upon which the Material will be Transported: Biscayne Avenue, Akron Avenue, County Road# 42, County Road# 46, County Road# 3, and State Highway# 52. 11. Haul Routes /Access Locations (Plan Sheet 1.07) The access points to and from the AUF will occur at the intersection of County Road #46 at Akron Avenue and at the intersection of County Road #46 at Station Trail. With the proposed mining operation spanning approximately 1.5 miles north to south and approximately 1.5 miles west to east, North Dry Mining will utilize access locations for ingress and egress to North Dry Mining phases 1 -7. During mining operations in the North Dry Mining Phases, the area depicted as future Boulder Trail will remain open and will serve as an internal haul road for material hauling activities utilizing the Boulder Trail/ Biscayne Avenue access location for access to CSAH #42. The access at Akron Avenue and County Road #42 will be utilized at the commencement mining of the North Dry Mining phases. In order to access Akron Avenue from the North Mining Area, an internal haul road will be constructed along the existing rail bed corridor which abuts North Dry Mining sub phase lA in the northeast corner. The Boulder Trail and Biscayne Avenue access will not be utilized until a traffic signal has been installed at Biscayne Avenue at County Road #42. Only one of these access points will be open for mining activities at any given time. 7 The internal haul routes for North Dry Mining phases 1 -7 will be maintained by the operator as needed and a water truck will be utilized to control potential haul road dust. Once all of the saleable material has been extracted and removed from North Dry Mining Phases 1 -7, the future Boulder Trail haul road and other internal haul roads will be reclaimed as per the interim use reclamation plan within 12 months. Material mined from Dry Mining Phases 8 -11 and Dry/Wet Mining phases 1 -5 will be transferred to the AUF by a conveyor system corridor which will be determined by Dakota Aggregates and UMore Park representatives onsite to maximize conveying efficiency and to minimize disturbance to agricultural research as much as possible. Once the material is conveyed to the AUF, it will be processed into varying construction grade aggregate products that will be hauled offsite at either the Station Trail /CSAH 46 access or at the existing Akron Avenue /CSAH 46 access location. Main Access Point Locations The following AUF and North Dry Mining accesses will be the main access points associated with the mining operation. Approval from Dakota County will need to be secured prior to using the following accesses and or any other desirable access locations that encompass the UMA. A. County Road# 46 at Station Trail (AUF) B. Akron Avenue at County Road# 46 (AUF) C. Akron Avenue at County Road 42 (North Dry Mining) D. Biscayne Avenue /Boulder Trail at county Road #42 (North Dry Mining) The following table provides a summary of the site generated traffic assignments to the main primary and secondary access locations proposed for 2013 through 2030. All truck trip estimates per access location(s) are based on the projected annual 3rd quarter aggregate sales totals which is considered the peak time for extraction activities and sales. The actual timing for the use of these access points will be based on the economy and market demand. A complete traffic analysis which is included in the EIS documents is available for greater detail relating to traffic counts and access analysis in section 3.10 entitled "Traffic" Summary of Site Generated Traffic Assignments to Accesses for 2011 and 2030 2013 ADT AM Peak Hour PM Peak Hour total enter exit total enter exit CSAH #46 at Station 270 28 14 14 16 4 12 Trail Existing Akron 268 27 13 14 16 5 11 Avenue and CSAH #46 CSAH #42 opposite 131 13 7 6 8 2 6 Akron Avenue Biscayne Ave. 131 13 6 7 8 2 6 opposite Boulder Trail Total 800 81 40 41 48 13 35 2030 CSAH #46 at Station 460 48 24 24 28 9 19 Trail 8 Akron Avenue and 459 46 23 23 28 9 19 CSAH #46 CSAH #42 opposite 298 30 15 15 18 5 13 Akron Avenue Biscayne Ave. 298 30 15 15 18 5 13 opposite Boulder Trail Total 1515 154 77 77 92 28 64 12. Hydrogeologic Study A hydrogeologic study is included in the Water Monitoring Plan that will be initiated upon approval of the mining permit. The hydrogeological study includes previous and current geologic and hydrogeologic information completed as part of the EIS. Updated information including data collected from new wells and updated water monitoring data will be included in future reports as proposed in the Water Monitoring Plan. The Hydrogeological Study and Ground Water Monitoring Plan are attached. 13. Description, Location and Construction of all wells within 300 feet of the EIS Boundary Please refer to figure 4 of the Groundwater Monitoring /Hydrogeological Plan for information pertaining to existing and proposed wells. 14. Description of each Groundwater Excavation (Size, Shape and Location) All of the floating dredge operations in the Dry /Wet Mining Phases 1 -5 will be conducted below or near the approximate elevation of the groundwater. The excavation excluding the above water side slopes will encompass approximately 132 acres. Once the mining activities have expired an end use lake with an undulating /natural shoreline consisting of approximately 132 acres will remain. Please refer to Interim and End Use Reclamation plan sheets 3.00 4.04. 15. Description of the Proposed Fill Activity in (Grain Size Distribution, Quantity, and Placement Procedures): A. Dry/Wet Mining Phases 1 -5 The end use reclamation plan calls for leaving the open water feature intact as a lake. No fill activity except for virgin sand material is proposed within the Dry/Wet Mining phases and for establishing shoreline features as described below. As part of mining activities, varying quantities of the minus #4 (sand and finer) fraction of the native materials will generally settle back into the lake basin or be placed along the shoreline. Some areas may be re contoured with the native sand and silt materials to create natural bathymetric contours for the lake basin. These materials will typically be placed as the dredge areas progress and will include shallow bench areas as well as adjacent steeper sloped areas to serve as a trap for fine- grained sediments and any nutrients that are not captured by storm water runoff control features. Where shallow bench slopes are needed, the native sand material may be placed via heavy equipment or conveyor system. B. Dry Mining Phases 1 -11 (North and South Dry Mining) Materials will consist of clean and compactable materials during the reclamation activities in the Dry Mining phases. The majority of the fill material will consist of minus #4 granular material. Placement of the fill material will be accomplished with conveyors, 9 trucks, scrapers, and dozers. 16. Description of the Aquifer Characteristics in the Area of Each Groundwater Excavation to be Affected by Proposed Fill Activity (Aquifer Thickness and General Geological) As noted above, the Groundwater Excavation will be left as an open -water lake feature. Although the native sand and gravel aquifer material may be disturbed, the only activities below water will consist of benching and re contouring with native sand and gravel materials with physical properties that are identical to those comprising the aquifer material. Geology of the deposit is described in the Gravel Resources Report (ProSource, 2008) and in the Groundwater Assessment Monitoring Report (Barr 2009). 17. Description of Impacts of the proposed Fill Activity on Groundwater Flow Regimes: A detailed description of groundwater flow in the uppermost saturated zone before, during and after mining is described in the EIS and supporting resource documents (Barr 2009, 2010). Groundwater moves from southwest to northeast across the mining area and will continue to do so in the future. As indicated in the EIS for the project, the mining operation will not significantly alter the flow direction, magnitude, or quality of groundwater. Long range simulations of groundwater pumping for wash water and other uses was evaluated during the EIS and found to have negligible impacts on surrounding water resources. 18. Groundwater Water Monitoring Plan The Groundwater Monitoring Plan describes the site geology and hydrogeology as well as the monitoring network dedicated to detection and response of potential impacts from the mining operations on water and groundwater. The Plan includes sampling locations, methods, frequency, quality assurance, and methods of analysis for the water data. The Groundwater Monitoring Plan for the facility will consist of the following: A description of the conceptual flow model including the geology, hydrostratigraphic units and map showing existing conditions, including existing wells A description of existing data and baseline conditions Identification of significant groundwater resources (e.g. supply wells) that are located downgradient of the mining operations and /or current Drinking Water Supply Management Areas. Identification of areas in the mine and Ancillary Use Facility that are planned for storage and handling of materials that are likely to contain readily leachable contaminants Discussion of likely constituents of concern that should constitute water quality monitoring parameters Summary of existing wells List of wells and schedule for decommissioning wells that will be sealed prior to mining The current and future monitoring wells proposed for detection monitoring Frequency of detection monitoring Parameters included in detection monitoring Methods for sampling and analysis A Quality Assurance Project Plan A definition of threshold criteria for implementing potential response actions resulting from detection monitoring (e.g. response plan) 10 A response plan for contingency and corrective actions related to groundwater data. Spill response is described the SPCC Plan. A description of how and when future conditions will change that will require review of the monitoring plan An annual report including description of the previous year's monitoring data and proposed actions or changes to be conducted in the future. The plan will follow standard industry practice and MPCA guidance for sampling groundwater. 19. Spill Prevention Control and Containment Plan (SPCC Plan) Federal law requires compliance with 40 CFR 112 for facilities storing more than 1320 gallons of above petroleum. This plan will describe the location, quantity and types of petroleum and hazardous substances stored and used within the UMA as well as the responsible persons, notification procedures, containment measures, inspection, documentation and spill response activities will be described within the report. 20. Potential Soil Contamination Areas with potential soil contamination have been investigated by the University and no impacts were identified. During mining operations, if potentially contaminated soil is encountered, Dakota Aggregates' environmental consultant will be the first responder and Department of Environmental Health and Safety (DEHS) staff at the University will work with the environmental consultant to remediate the release. The ECP includes procedures for soil characterization and temporary on -site management of potential soil contamination and disposal procedures. The presumptive method for disposing of contaminated soils will be to excavate and haul the soils directly to a permitted solid waste facility. 21. Environmental Contingency Plan (ECP) An environmental contingency plan is attached. The goal of the plan is to anticipate, identify, and respond to a variety of conditions that may be uncovered within the subsurface during mining activities. The plan describes areas where potentially hazardous substances or petroleum are suspected to be present as a result of past land use activities. As noted above, areas with potential soil contamination have been investigated by the University and no impacts were identified. In addition, the plan provides a procedure for pre- mining site screening, training, operational procedures for identifying potential environmental contingency items, notification procedures, and appropriate steps toward identifying and addressing potential environmental concerns. The plan also includes a section regarding the assessment and response to potential asbestos containing materials that is in accordance with University policy and state requirements. 22. Response Action Plan (RA Plan) If potential soil contamination has been identified during the implementation of the ECP during excavation, a soil investigation by the University will be conducted in accordance with the MPCA guidance document titled Risk Based Site Characterization and Sampling Guidance (September, 1998). If the results of the investigation indicate that a release of petroleum or hazardous substances has occurred above appropriate land use specific MPCA risk -based criteria, a response action (RA) will be required before further excavation or mining activities are undertaken. The 11 results of the soil investigation and proposed RA will be described in a RA Plan which will be submitted to the MPCA for approval. Upon completion of the approved RA activities, an implementation report will be submitted to the MPCA for approval and the issuance of the appropriate letter(s) of assurance. 23. Location of Any and All Existing Wells and the Size and Depth Thereof: Please refer to the Groundwater Monitoring /Hydrogeological Plan for information pertaining to existing and proposed wells. 24. Surface Water Protection Plan The surface water protection plan describes Best Management Practices for managing storm water and erosion control at the UMA. An MPCA/NPDES storm water permit is required prior to the commencement of activities disturbing soil at the site which includes a Storm Water Pollution Prevention Plan (SWPPP) as part of the permit. 25. Gravel Crushing (Accessory Use) A. Dry Mining Phases 1- 11(North and South Dry Mining) Primary crushing will occur with the use of a jaw crusher, cone crusher, conveyors, and a horizontal screen box. B. Dry/Wet Mining Phases 1 -5 Primary crushing will occur with the use of a jaw crusher, cone crusher, conveyors, and a horizontal screen box. C. Ancillary Use Facilities Primary, Secondary, and tertiary crushing will be performed in the AUF in conjunction with the crushing activities located in the Dry and Dry/Wet mining phases with use of a jaw crusher, cone crusher, conveyors, and a horizontal screen box. 26. Gravel Washing (Accessory Use) A. Dry Mining Phases 1- 11(North and South Dry Mining) Sand and gravel may be washed within an active Dry Mining phase with use of portable washing equipment such as horizontal screen decks, course and fine material screws, dewatering devices, conveyors and recalculating wash ponds B. Dry/Wet Mining Phases 1 -5 Sand and gravel may be washed within an active Dry/Wet Mining phase with use of portable washing equipment such as horizontal screen decks, course and fine material screws, dewatering devices, conveyors and recirculation wash ponds C. Ancillary Use Facilities The majority of the sand and gravel will be washed in the AUF. Equipment will include horizontal screen decks, course and fine material screws, dewatering devices, conveyors and recirculation wash ponds. 12 27. Offices associated with the Mining Operation and Ancillary Uses(Accessory Use) An office and scale houses will be utilized within the AUF and in the North Dry Mining Phases. The office and scales house locations are depicted on plan sheet 1.08. Portable scales may be utilized in the North Dry Mining phases in locations to be determined by the operator at a later date. Generally, the portable scales will be set up near and parallel with either of the North Dry mining accesses. Since only one of these accesses will be utilized at any given time only one set of scales will need to be utilized at the open access. 28. Truck Washing (Accessory Use) A. Dry Mining Phases 1 -11 (North and South Dry Mining) None B. Dry /Wet/Dry Mining Phases 1 -5 None C. Ancillary Use Facilities Truck washing/rinsing will take place in both the ready -mixed concrete facility and in within the maintenance facility. Typically after loading, ready -mixed concrete trucks will be rinsed with a non -toxic biodegradable cleaner prior to leaving the AUF and entering onto the public roadway system. Truck/equipment washing will also occur within the maintenance facility. Typically, equipment will be cleaned prior to maintenance. The run -off associated with the equipment washing within the maintenance facility will be self contained with drainage trenches which will be connected to an oil and water separator. Oil will be added to the waste oil tank or hauled offsite by a licensed waste hauler. A licensed waste hauler will pick up, transport, and properly dispose of any industrial waste water from the separator. 29. Minor Vehicle and Mining Equipment Maintenance(Accessory Use) Minor vehicle and mining equipment maintenance will mainly occur in the AUF. However, routine minor vehicle maintenance may occur in the Dry Mining phases but only on equipment that is being utilized within the Dry Mining extraction activities such as a loader or bobcat during extraction activities or 1 to 2 scrapers and a bulldozer during berm construction and surface soil relocation activities which occur every couple of years. 30. Stockpiling(Accessory Use) Aggregate material and overburden material stockpiling will occur in both the AUF and within any active mining phase. Initially, overburden material will be utilized for berm construction. Once the berms are in place, overburden material may be stockpiled around the perimeter of an active or inactive mine phase and utilized for reclamation purposes once any given mine phase is being reclaimed or overburden material will be stockpiled adjacent to or within the aggregate and RAP processing facility and mixed with aggregate products as binder in certain aggregate material specifications such as class 5. Overburden stockpiles will be temporarily vegetated as needed for erosion and sediment control. 31. Storage of Machinery used daily in the Extraction Area(Accessory Use) 13 Only equipment utilized daily within an active mine phase will be stored in the active mine phase. All equipment will be stored in an orderly fashion during the hours in which any given phase is not permitted by ordinance to operate. All equipment will be well kept and maintained to high quality standards. Equipment in active mining phases will include scrapers and bulldozers for relocation of surface soils and berm construction and processing equipment, conveyors, loaders, bobcats and possibly 1 to 2 generators for powering of the processing equipment during the extraction activities. 32. Ancillary Uses (Separate Interim Use Permit Required) A. Concrete Production: A ready -mixed concrete plant will be located in the Ancillary Use Facility. Production in this area requires a plant capable of storing and mixing the ingredients for the various mix designs. Ready -mixed plant sites within the AUF will have unenclosed storage silos for the cement materials, storage tanks for the liquid additives and drive over aggregate hoppers. The concrete plant within the Ancillary Use Facility will be enclosed. However, this plant will be operational before and during construction of the enclosed building which will house the primary ready- mixed concrete plant. An additional concrete plant may be utilized as well. However, this plant will be portable. Although this plant is portable, all requirements such as setback requirements, maximum stock pile heights of 60 feet, and the maximum plant height of 105 feet will be adhered to. Please refer to plane sheet 1.08. The construction of the enclosed concrete plant will need to be completed within 18 months of the IUP approval and the secondary concrete plant will not be permitted unless an IUP for the enclosed concrete plant has been issued. An Interim Use application will be submitted to the City for an enclosed ready mixed concrete plant at a date to be determined. 1. Air Emissions: Any facility that manufactures and sells concrete is subject to the air quality requirements as listed in Minnesota Rules 7011.0850.7011.0860. These rules require emission control standards in relation to the ready- mixed concrete facilities and will be adhered to by the operator. Additionally, any plant that produces more than 180,000 cubic yards of unhardened concrete per year must apply for an air emissions permit through the Minnesota Pollution Control Agency (MPCA). 2. Outdoor Storage: There shall be no outdoor storage of finished concrete materials or products within the concrete plant area. All Equipment and raw material associated with the concrete plants will be screened from view from adjacent residential uses or the public right with a combination of berms and existing tree coverage along the north side of County road #46 and along the south side of the 130 acre mining buffer in conformance with section 11 -2 -9 "Outdoor Storage. 3. Hours of Operation /Haul Routes The proposed hours of operation for the concrete plants which will be located in the Ancillary Use Facility are 24 hours 7 days a week. Hauling activities associated with the Ready mixed concrete facility will only occur at the AUF access locations with direct access onto CSAH #46. Lighting that is required for nighttime operations will be shielded to prevent lights from being directed at 14 traffic on public roadways in order to prevent vision of traffic on CSAH #46 and the level of lighting will not exceed 1 lumen at the EIS boundary in order to not disturb the surrounding properties. Noise levels will comply with the regulations established by the MPCA. B. Asphalt Production: (Separate Interim Use permit Required) An asphalt plant will be located in the Ancillary Use Facility and will be located in accordance with the setback requirements required by the City. The asphalt plant (Sheet 1.08) will require areas for liquid storage tanks and components which vary depending on the asphalt mix specifications including tanks for asphalt cement, tack oil, and heating oil. Additionally, raw aggregate storage bins will be required to separate and store the various raw aggregate products that are added to the various asphalt mixture specifications as they are produced as well as material stock piles which will not exceed the maximum height of 60 feet. The asphalt plant and all equipment associated with it will be set back a minimum of seventy five feet (75') from the EIS property boundary line and screened by natural features including berming or vegetation. Year round one hundred percent (100 opaque screening with earthen berms and landscaping will be constructed as needed and measured from ground level to the first thirty percent (30 of the overall height and fifty percent (50 opaque to fifty percent (50 of the overall height of the plant as viewed from eye level from surrounding right of way or roadways. A combination of berm construction and existing tree cover both to the north and abutting County Road 46 will sufficiently screen the plant and the other ancillary uses. An approved interim use permit will be required for the asphalt plant which will be submitted by Dakota Aggregates at a date to be determined. 1. Hours of Operation /Haul Routes /Access: The proposed hours of operation for the asphalt plant which will be located in the Ancillary Use Facility are 24 hours 7 days a week. Hauling activities associated with the asphalt facility will only occur at the AUF access locations with direct access onto CSAH #46. Lighting that is required for nighttime operations will be shielded to prevent lights from being directed at traffic on public roadways in order to prevent vision of traffic on CSAH #46 and the level of lighting will not exceed 1 lumen at the EIS boundary in order to not disturb the surrounding properties. Noise levels will comply with the regulations established by the MPCA. 2. Material Stockpiles: Material stockpiles associated with the asphalt plant will not exceed 60 feet in height. 3. Outdoor Storage There shall be no outdoor storage of finished asphalt materials or products. All Equipment and raw material associated with the asphalt plant will be screened from view from adjacent residential use or public right of way with a combination of berms and existing tree coverage along the north side of County road #46 and along the south side of the 130 acre mining buffer in conformance with section 11 -2 -9 "Outdoor Storage. 4. Air Emissions: 15 Asphalt operations are subject to federal rules NSPS, 40 CFR Part 60, Subpart 1, which regulates particulate emissions and opacity. Moreover, asphalt operations are also subject to state requirements in Minnesota Rules 7011.0900- 7011.0922 which address the various testing, monitoring and operational requirements. 5. Waste By Products: The asphalt plant operation shall operate not to discharge onto the soils of the lot, across the boundaries of the lot or through percolation into the subsoil of the lot or beyond the boundary of the lot where such use is located, toxic or noxious matter in such concentrations as to be detrimental to or endanger the public health, safety, comfort or welfare; or, cause injury or damage to property or business. 6. Odors: The asphalt plant will operate in a way so as to minimize the emission of odorous matter of such quality as to be readily detectable beyond the EIS boundary line of the site on which such use is located. C. Maintenance Facility (Separate Interim Use permit Required) The maintenance facility will be used to service and repair equipment associated with the mining operation and will comply with the City's general Industrial site, lot and building standards within subsections 11 -4 -16 F and G. Activities such as truck and loader routine maintenance such as lubrication, changing of tires, oil and filter replacements, and welding will generally be the maintenance items which will occur at this facility. The main fueling, storage, and processing areas will be located within the Ancillary Use Facility located on a portion of the mining area that will not be mined. The AUF is located on a portion of the mining area that is underlain by low- permeability geologic materials and possesses a significant thickness of buffering soil to protect groundwater resources. In addition, the operations will include settlement ponds and Best Management Practices to prevent leaching of materials to the underlying soil and minimize the risk of groundwater contamination. Maintenance facility operations are proposed 24 hours a day 7 days a week. Lighting that is required for nighttime operations will be shielded to prevent lights from being directed at traffic on public roadways in order to prevent vision of traffic on CSAH #46 and the level of lighting will not exceed 1 lumen at the EIS boundary in order to not disturb the surrounding properties. Noise levels will comply with the regulations established by the MPCA. An approved interim use permit will be required for the maintenance facility which will be submitted by Dakota Aggregates at a date to be determined. D. Casting Yard (Separate Interim Use permit Required) The casting yard will be located in the north eastern portion of the Ancillary Use Facility. Precast products for use on various construction projects such as bridge beams, rails, caps and other precast products will be manufactured within an enclosed portable structure and then cured in the outdoor casting yard. From time to time casting may need to occur 16 outdoors when oversized products such as bridge beams are produced for various construction projects. The casting facility will contain various precast forms and components which are used in the production of the precast products. During precast production, ready -mixed concrete trucks will enter the casting facility to deliver the ready- mixed concrete that will be utilized to produce the various cast concrete products. Once the precast products have cured, they will be loaded onto trucks and exported to various jobs or stored within the casting yard until such products need to be transported to various construction projects. The finished precast products which will be stored in the casting yard will not exceed 15 feet in height and will be stored in a uniform fashion. A mobile gantry crane which will be approximately 30 feet in height will be utilized to transport precast concrete products from the casting /forming facility to either the storage yard and or for loading of trucks with the finished precast products. Year round one hundred percent (100 opaque screening with earthen berms and landscaping will be constructed as needed and measured from ground level to the first thirty percent (30 of the overall height and fifty percent (50 opaque to fifty percent (50 of the overall height of the plant as viewed from eye level from surrounding right of way or roadways. The proposed hours of operation for the casting yard which will be located in the Ancillary Use Facility are 24 hours 7 days a week. Hauling activities associated with the casting yard facility will only occur at the AUF access locations with direct access onto CSAH #46. Lighting that is required for nighttime operations will be shielded to prevent lights from being directed at traffic on public roadways in order to prevent vision of traffic on CSAH #46 and the level of lighting will not exceed 1 lumen at the EIS boundary in order to not disturb the surrounding properties. Noise levels will comply with the regulations established by the MPCA. An approved interim use permit will be required for the maintenance facility which will be submitted by Dakota Aggregates at a date to be determined. E. Aggregate Processing and Recycled Aggregate Production Products: (Separate Interim Use permit Required) Aggregate processing consists of extracting and conveying raw aggregate material from the active mine site and processing the raw aggregate into various specifications for construction grade sand and gravel products through the use of processing equipment such as wash plants, screens, conveyors, cone crushers and jaw crushers. Once processed, the aggregate products are stockpiled within the AUF aggregate processing facility and eventually loaded into outbound trucks once sold. Recycled Aggregate Products (RAP) mainly consists of recycled asphalt pavement and recycled concrete products which is produced by removing and reprocessing existing asphalt pavement and /or the demolition of concrete roads and is then recycled to produce various asphalt and concrete products. There will be aggregate and RAP storage and processing in the western portion of the Ancillary Use Facility. Trucks will import and unload used asphalt and concrete materials and then typically re load with finished aggregate products before they leave the site 17 allowing for an efficient two -way haul scenario. Other trucks will enter the site empty and leave with aggregate products that have been extracted from within the mine site and processed in the AUF aggregate processing facility to meet various construction specifications. RAP material will be stored within the AUF which is approximately 70 feet above the water table and is located on a portion of dense glacial till which will act as a barrier to contamination to protect the groundwater from potential leachating of the RAP material. The RAP processing plant will be screened with a combination of berms and existing tree coverage along the north side of County Road #46 and along the south side of the 130 acre mining buffer in conformance with section 11 -2 -9 "Outdoor Storage. A recirculation wash pond system designed to provide water for the washing of material will be built in the southern portion of the aggregate processing area. A pump will deliver water from this pond for the washing of material with this same water subsequently returned to the pond to maintain a closed -loop system. The proposed hours of operation for the aggregate processing and recycled aggregate production are 24 hours a day 7 days a week. Hauling activities associated with this facility will only occur at the AUF access locations with direct access onto CSAH #46. Lighting that is required for nighttime operations will be shielded to prevent lights from being directed at traffic on public roadways in order to prevent vision of traffic on CSAH #46 and the level of lighting will not exceed 1 lumen at the EIS boundary in order to not disturb the surrounding properties. Noise levels will comply with the regulations established by the MPCA. An Interim Use permit application has been submitted to the City of Rosemount for the aggregate processing and recycled aggregate products permit. 33. Setbacks: Setback boundaries shall be as follows. In the case that the setbacks are measures from zoning district boundaries that occur along a public street right -of -way, the zoning district boundary is assumed to be the centerline of that public right -of -way. a. Residential Zoning District: 350 feet b. Industrial, Commercial, or Institutional Zoning District: 150 feet c. Agricultural Zoning District: 30 feet d. Inhabited Residence: 200 feet e. Right of way, Streets, and City easements: 75 feet f. Pre existing water bodies: 150 feet 34. Height: The height of all conveyors shall be no more than a maximum of 65 feet. 35. Appearance, Screening, and Berming: 18 A combination of berms and existing tree stands along the south side of the 130 acre mining buffer and adjacent to County Road 46 will provide adequate screening as per ordinance standards. The existing tree stands will provide at least 90% opacity. Prior to mineral extraction on a phase by phase basis, each phase of the mined area will be excavated to strip and stock pile surface soils for later use in reclamation. The soil will be stockpiled in a series of berms that will also serve as visual barriers along the property boundaries. Berming will be constructed 10 feet high measured from the shoulder of the road with a 5 foot top and 3:1 interior side slopes with 4:1 exterior /right of way side slopes as indicated on the berming plan. The berm will be seeded and maintained as needed by the operator. As mineral extraction resides at lower elevations of depth, the equipment and the extraction area will not be visible to the adjacent residential properties on the North side of County Road 42. Please refer to Temporary Berm Cross Section Plan sheet 2.14. Additionally, the existing tree coverage will naturally assist in screening the mining operations as well. Gates will be installed at all access entrances in use. A. Berms (County Road 42) Initially, overburden material (black dirt and clay) will be utilized in berm construction along the northern boundary or the North Dry Mining phases abutting the south boundary of the mining buffer in areas where existing tree stands are not present. Secondary berms may be constructed as mining activities progress into North Dry Mining phases. If secondary berms are constructed in an active mine phase they will be removed and utilized for reclamation activities in any exhausted mine phase. Once the final North Dry Mining phases of 80 acres or less are mined out and are being reclaimed, the Berm along the northern boundary of the North Mining area will be removed and utilized in the reclamation process. B. Berms (South of Future Boulder Trail) Once the North Dry Mining phases are completed and the berming along the northern boundary of the North Dry Mining phases has been removed, a temporary berm will be constructed on the south side of future Boulder Trail if necessary for screening purposes as per the City's ordinance standards. C. Berms (Biscayne Avenue, County Road #46, and AUF) Berms will be constructed along Biscayne Avenue, County Road #46(where existing tree stands are not present), and around portions of the AUF as indicated on the berming plan. Once constructed on a phase by phase basis these berms will remain in place for the entire duration of the mining operation. The timing of berm construction along CSAH #46 and Biscayne will occur on a phase by phase basis depending on the quantity of surface soils which are present at the time that each period of surface soil relocation. Berming will be constructed to sufficiently screen an active mine phase or an active ancillary use in areas where existing tree stands do not provide adequate screening. When future Akron Avenue has been constructed through the AUF, berms will be constructed on the east and west sides of future Akron Trail where existing tree stands do not sufficiently provide the required screening. Upon completion of berm construction, excess black dirt and overburden material will be stockpiled adjacent to an active phase. The overburden material will also be utilized to construct temporary diversion dikes around open water areas within active mine phases in order to divert surface water around the active mining/pit area. Upon completion of mining activities in each phase, the topsoil will be evenly re spread on the exhausted mine phase once final grades have been 19 established. After the black dirt has been re spread, the reclaimed ground will either be utilized for agricultural operations or will be established with the general seed mix consisting of a MN /DOT 250 design or equivalent seed mix The entire site will be maintained in a neat an orderly fashion. The operator will be responsible for noxious weed maintenance within any active phases of the extraction area as well. Berming details are displayed on plan sheets 2.00 -2.14. 36. Hours of Operation A. Dry Mining Phases 1- 11(North and South Dry Mining) Mining operations in the Dry Mining phases are proposed from 7 a.m. to 7 p.m. Monday through Saturday. Additionally, we would like to ask for the ability to operate up to 5 Sundays annually. If Sunday operations need to occur, we will notify the Community Development Director no less than 72 hours before a Sunday operation. B. Dry/Wet Mining Phases 1 -5 Dredging and processing activities in the Dry/Wet Mining phases will be conducted 24- hours a day 7 days a week. This will allow greater quantities of mineral extraction to occur on an annual basis without causing a nuisance to surrounding properties. The closest distance which any Dry /Wet Mining phase will be located in relation to the residences along county Road 42 is almost 1/2 of a mile (2200 feet) which will allow for the mining operation to occur 24 hours a day without disturbing the residents located on the North side of County Road 42. Additionally the mine floor will be located approximately 80 feet below the top of the berms. C. Ancillary Use Facilities The AUF operations will be conducted 24 hours a day 7 days a week. With the short peak construction season in Minnesota, we will need as much processing time as possible to manufacture significant quantities of aggregate products to meet specifications for public and private projects that will arise over the life of the mining operation. In line with the most recent MNDOT and other local agency guidelines, nighttime and weekend construction activities need to occur in order to avoid peak hour traffic congestion which provides increased safety for the constructions crews. 37. Crushing and Washing Hours of Operation: A. Dry Mining Phases 1 -11 Crushing, washing and screening activities are proposed from 7 a.m. to 7 p.m. Monday through Saturday. B. Dry/Wet Mining Phases 1 -5 24 hours of operation 7 days a week for crushing, washing and screening activities. C. Ancillary Use Facilities 24 hours of operation 7 days a week for crushing, screening, and washing activities. 38. Truck Hauling Hours of Operation: 20 A. Dry Mining Phases 1 -11 Hauling activities are proposed from 7 a.m. to 7 p.m. Monday through Saturday. Additionally we would like to ask for permission to haul on a maximum of 5 Sundays annually from 7 a.m. to 7 p.m. B. Dry /Wet Mining Phases 1 -5 Hauling activities utilizing the AUF access points onto County Road #46 are proposed at 24 hours a day 7 days a week. C. Ancillary Use Facilities Hauling activities utilizing the AUF access points onto County Road #46 are proposed at 24 hours a day 7 days a week. 39. Staging Activities Staging activities will occur one half hour before normal hours and one half hour after normal hours of operation. Staging activities include lining up and loading of trucks, equipment inspections, fueling, and other similar related actions. Trucks may enter the site within one half hour before the normal hours; however, no gravel trucks may leave the site until normal hours of operation. After the p.m. normal hours of operation and within one half hour past the p.m. normal hours of operation, site clean up and equipment maintenance may occur as well. 40. Slopes: A. Mining During the entire period of operations, all excavations of the working face shall be sloped on all sides at a maximum ratio of one (1) foot horizontal to one (1) foot vertical, unless a steeper slope shall be approved by the City Engineer. B. Berming: The public view or right -of -way face of the perimeter berms shall be sloped at a maximum ratio of four (4) feet horizontal to one (1) foot vertical. The extraction side of the perimeter berm shall be sloped at a maximum ratio of three (3) feet horizontal to one (1) foot vertical. 41. Noise The mining operation will generate minimal noise through the use of construction equipment such as loaders, bulldozers, backhoes, crushers, dredges, etc. Mining and processing operations will be setback from adjacent properties and dwellings per ordinance standards. As mineral extraction resides at lower elevations of depth relative to the natural ground elevations, the noise from equipment will be minimized for the adjacent property owners. A 10 foot high berm with a 5 foot top and 4:1 side slopes (right of way side) will be constructed on a phase by phase basis adjacent to a County Road 42 on the northern boundary of the North Dry Mining phases where existing tree stands do not exist, Biscayne Avenue, adjacent to County Road 46 where existing tree stands do not exist, and as needed for screening around the AUF. Moreover, the AUF operations are at least'' /2 1/3/4 miles away from such residences and will be screened with berms and existing tree stands as well. In the state of Minnesota, noise is regulated by the Minnesota Pollution Control Agency and their Noise Program can be found at http: /www.pca.state.mn.us /programs /noise.html Noise standards are set for both daytime and nighttime hours and are dependent on a classification number as 21 defined by the land use activity. If a noise source is found following a complaint, many times an adjustment in the field will alleviate the problem. If it becomes hard to locate the source, noise data may prove helpful in determining if the standards are being met along property boundaries and even whether the noise source is coming from the site in question. Through the use of a noise meter and data logger, this information can be plotted along with the standards to track the information over time. A. Dry Mining Phases 1- 11(North and South Dry Mining) Operations in Dry Mining Phases 1 will occur only between the hours of 7 a.m. to 7 p.m. Monday through Saturday and will maintain a setback from the residences on the North side of County Road #42 of at least 1000 feet and up to 1600 feet in relation to the northernmost North Dry Mining phases. Additionally, the 130 acre mining buffer along with berm construction to the North of the North Dry Mining phases will alleviate potential noise issues in relation to the residences located on the north side of County Road 42. B. Dry/Wet Mining Phases 1 -5 Operations in the Dry/Wet mining phases which will occur 24 hours a day 7 days a week will occur from approximately '/2 1 '/2 miles away from the residences on the north side of County Road 42. C. Ancillary Use Facilities Operations in the Ancillary Use Facility will occur 24 hours a day 7 days a week and will maintain a minimum distance of approximately 1 1 '/2 miles in relation to the residences located on the north side of County Road 42. 42. Paved Access Roads/ Dust Control: The AUF and North Dry Mining access roads utilized by the mineral extraction operation connecting to any public roadway shall be hard surfaced for a distance of at least 150 feet measured from the mining side of the public right -of -way to minimize dust conditions. Vehicles, crushing and processing equipment, and active mineral extraction within the mining operation will be the primary source of dust generation. A water truck will be used as needed for dust control. The natural moisture of the in -place material especially in the Dry/Wet Mining phases as well as the moisture associated with the aggregate material washing process in many of the aggregate stockpiles will help reduce the fugitive dust generated from the mining process. The elevation difference between the mine floor and the surrounding land will also mitigate fugitive dust. The interior and secondary access /haul roads will be constructed of crushed rock to reduce the tracking of dirt and the generation of dust from the site. A water truck and or portable dust suppression systems will be utilized as needed for dust control. Most material will be transported to the plants via conveyors. The site will operate under an MPCA air emissions permit which regulates air emissions from equipment and fugitive dust emissions from general mining operations. 43. Explosives: Explosives will not be utilized in the mining operation. 44. Surface Water Protection Plan: The existing /pre- mining drainage for the site consists of approximately 475 acres of land that drains to landlocked basins within the site and approximately 448 acres of land that drains off -site to the west and to multiple locations in the east as shown on sheet 1.04. There is no drainage currently 22 coming to the site from adjacent properties, as there are similar landlocked basins within those properties that handle their drainage on -site or there are drainage conveyances within their properties that take the drainage away from the proposed site boundary. The proposed /reclamation drainage for the site will consist of approximately 540 acres of land within the pit boundary, that drains to the on -site end -use permanent groundwater lake, approximately 280 acres of land adjacent to the pit boundary that will drain to on -site landlocked basins or constructed sediment and dry basins (no outflow 100 yr event), and approximately 103 acres of land that drains off -site to the west and to multiple locations in the east as shown on sheet 1.05. The landlocked basins adjacent to the pit are created by the permanent diversion dikes and existing depressions in the topography. The AUF area drains to constructed sediment and dry pond basins located within the AUF boundary. These basins are designed to treat the storm runoff per MPCA permanent volume requirements as well as retain the entire 100 yr storm volume generated by the ultimate AUF build out and the potential Future Akron Avenue extension. The sediment basin will be lined with on -site clay in order to maintain a normal water elevation for treatment. According to the Stormwater Trunk System map illustrated within the City's Comprehensive Surface Water Management Plan, there is future off -site drainage from areas to the north and west of the site that will be pumped to and potentially drained through the site /end use permanent groundwater lake. The -132 acre permanent groundwater lake will be able to handle these potential lift station inflows due to its large natural infiltration capacity (unlined lake side slopes) as well as its large surface area for potential flood bounce. These off -site drainage systems (pipe and lift stations) will be constructed as part of the City's Storm Water Capital Improvement Projects (CIP). During mining operations as well as after interim use reclamation grades are established, the area surrounding the mining operation/pit boundary will remain in agricultural production or in vegetated green space with a general seed mix (MNDOT #250) and its runoff will be managed outside of the mining operation, not allowing the runoff to drain into the pit with construction of temporary and permanent diversion berms and or silt fence. The mining area itself will manage its runoff internally allowing no storm water runoff to leave the pit boundary. Overall, storm water runoff before and after mining will generally be the same as far as quality and will be less for runoff quantity during and after mining operations. A NPDES Storm Water Pollution Prevention Plan (SWPPP) will be used throughout the entire mining process relocation of surface soils, to active mining, to site reclamation. Additionally, the SWPPP will incorporate Best Management Practices as needed on a case by cases basis to insure all storm water runoff will be equal to or better than the pre- mining runoff in both quality and quantity. Plan sheet 1.06 depicts the potential temporary and permanent erosion and sedimentation control practices that may be utilized within the mining site. 45. Industrial Waste Water and Water Pumping Activities The wash plants (except for asphalt production which does not create any wastewater) associated with aggregate production will generate industrial wastewater which will contain suspended solids as a result of the washing of processed aggregate. This water will not contain any chemical additives. Water used for washing aggregates and concrete production will be recycled by circulation into wash water settlement basins (aggregate) or to a weir system (concrete) for treatment and then will be redirected back into the wash plant for re -use. Due to production losses, evaporation, and some infiltration, the additional sources of water (either from groundwater or the 23 floating dredge) will be used as `make up' water to replace production loss and to maintain constant flow volume in the process. Dry mining operations will require appropriation of groundwater to support aggregate material washing activities and concrete production. The groundwater withdrawals would likely be temporary in nature because water can be supplied directly from the lake surface after the dredge operations are underway. The temporary groundwater demand will consist of an estimated total rate of 400 gallons per minute. Generally the washing activities will require 250 gpm of groundwater withdraw, whereas concrete production will require 150 gpm of groundwater withdraw. The water supply for these operations will come from existing irrigation wells or a combination of new and existing wells. These withdrawal rates will not be constant and will vary with time of day and seasonally with the construction season. Aggregate wash plants and wash water settlement basins will be separate from ready -mixed concrete production settlement basins /weir systems. The aggregate processing wash water settlement basins will be lined and the concrete ready -mix settlement basins /weir systems will be constructed with concrete. In addition to the groundwater withdraw makeup; the wash plant will require recycled processed water from the lined wash water settlement basins. Any oil or wastewater generated in the maintenance facility from an oil -water separator will be picked up by a licensed waste hauler for subsequent disposal in accordance with all applicable regulations. 46. Drainage characteristics during extraction, erosion control See plan sheets 1.04 and 1.05 for details regarding existing and proposed site drainage patterns. Plan sheets 1.06, 2.00 -2.13, and 3.00 -3.04 contain construction details and specifications, implementation sequences and locations, MPCA permit requirements for erosion and sediment control, berming /screening facilities, lake benching details, and proposed interim reclamation plans. The interim reclamation and proposed drainage plans will serve as a guide to elevations and drainage patterns across the site during mineral extraction. All erosion control standards will meet both the MPCA and the UMore Park Mining District Ordinance requirements including temporary and permanent diversion dikes around open water areas, turf establishment, silt fence installation as needed, and other potential BMP's as depicted on plan sheet 1.06. During the mining operation and interim use reclamation the entire mining /pit area will be recessed and therefore be self contained in regard to storm water runoff and erosion and sediment control. The pit floor within the mining area will receive all interior mining/pit area runoff during operations and interim reclamation. All areas outside of the current mining phase will remain in agricultural production or their existing vegetated state reducing the potential for erosion and sediment related issues. These areas either will drain to an existing on -site landlocked basin or will continue off -site along its pre- mining drainage route. With the reduced runoff from the mining area, and the remaining area still in agricultural production, the runoff produced during mining phases and after reclamation will have no negative impact on the water quality of the receiving waters. In the Dry/Wet Mining phases, the water elevations will remain at the existing seasonal water table elevations within that particular phase. The current range of ground water elevations across the site is from 891 to 878, southwest to northeast. These ground water elevations, as determined by 24 the preliminary soil boring log analysis (ProSource Technologies, Inc.), may differ from the actual elevations encountered during extraction due to changes in precipitation, ground water pumping, evaporation, seasonal variations, etc. throughout the life of the mine. Based on the previous information and given the fluctuating nature of the ground water elevations, it is estimated that the final end -use lake water surface elevation will be 880. 47. Dewatering: There will be no groundwater dewatering at any time during mining activities. 48. Domestic Wastewater Portable bathroom facilities (porta- potties) will be located in active mining phases as well as in the AUF. An Individual Sewage Treatment System (ISTS) may be utilized within the AUF in the future. If an ISTS is needed, all applicable local and state permits and regulations in regard to system installation and maintenance will be adhered to by the operator. 49. Topsoil: All topsoil located on the site before the mineral extraction operation begins, except the topsoil located over areas that are planned to be reclaimed as open water, will remain within boundaries of the operation. Additional topsoil may be retained to ensure that a minimum of 6 inches of topsoil is placed on all area reclaimed and restored as dry ground. 50. Landscaping All berms that will remain permanently in place for more than 15 years will be vegetated with a standard MNDOT #250 Seed Mix and landscaped on the public view right- of —way side with a density of one tree per 625 square feet with a minimum of 66% of the trees being conifers. The permanent berms include berming along Biscayne Avenue, County Road #46, the berm areas around the AUF and possibly the berms along future Akron Avenue which will be dependent on the actual timing of the construction of Future Akron Avenue. Permanent Berms will be constructed on a phase by phase basis and in some instances the berm may extend past the required coverage for the active mine phase. In these instances, the installation of trees is proposed to occur to the point at which bean construction and landscaping is required to sufficiently screen the active mine phase. All berms constructed will be vegetated with a MNDOT #250 seed mix regardless of whether or not the berm is part of the screening for the active mine phase. Please refer to landscape plan sheets 2.00 -2.13 for landscaping details. 51. Maintenance of Mining Vehicles All machinery will be kept operational. Abandoned machinery and rubbish will not be present at the mining site. All Machinery will be periodically inspected, repaired, and painted as needed. 52. Lighting: All lighting will be shielded to prevent lights form being directed at traffic on a public road in such brilliance that it impairs the vision of the driver and may not interfere with or obscure traffic sign or signals. All lighting will not exceed one lumen at the EIS boundary line. All lighting requirements and regulations are federally mandated by MSHA and OSHA in relation to mining operations including the UMore mining area. A. Dry Mining Phases 1- 11(North and South Dry Mining) Since Dry Mining phases 1 -11 will typically operate during the daytime, little to no lighting will be required. At most a few security lights may be installed for the night time hours. B. Dry /Wet/Dry Mining Phases 1 -5 25 A combination of portable light plants and permanent street light types of fixtures will be utilized for safety and visibility within the Dry/Wet/Dry Mining phases. C. Ancillary Use Facilities A combination of portable light plants and permanent street light types of fixtures will be utilized for safety and visibility within the Ancillary Use Facility. 53. Phasing Standards: Dry Mining and Dry/Wet Mining phases will contain sub phases that range from 3 to 25 acres in area. Once mineral extraction has expired in any given sub phase, mining activities will begin in the next sub- phase. More than one sub phase may be active simultaneously; however no more than 2 non contiguous 80 acre areas /phases of the mining operation will occur concurrently. With the exception of South Dry Mining Phase 11, The Dry Mining portion of the phasing plan has been designed to extract minerals sequentially north to south in order to minimize the time in which land can be mined and reclaimed and to allow for orderly development of the property commencing in the north once the mined areas has been reclaimed. The Lessor (Regents of the University of Minnesota) has requested that Dry Mining phase 11 occur as the last phase in the UMore Mining Area. Relocation of these existing facilities requires substantial planning and time. Throughout the active mining sub- phases, the operator will relocate the surface soils encompassing several acres in order to open the mine face, to construct berming, and for the set up of portable processing equipment. As the aggregate material is extracted and the mine face advances, additional acreage will be opened and mined as needed. The equipment that will be used on this portion of the mine for extraction will include large front end loaders, back hoes, a dredge, crushers, screens and conveyors. The extracted materials are transported by conveyors and /or haul trucks to either a dry plant or to a wash plant within the AUF or in an active mine phase. The extracted material is processed through a series of crushers, cones, screens, conveyors, and wash decks to produce the commercial grade specifications in terms of aggregate products. The finished products are stockpiled in the AUF or in the active mine phases and eventually hauled offsite for specific projects around the metro area. Material will be excavated from the current elevations down to the elevations determined by the actual quality, quantity, and depth of the aggregate deposit, and then reclaimed to the elevations as depicted on the interim use reclamation plan or with respect to the Dry/Wet Mining phases only, the end use reclamation plan. All areas outside of the current mining phase with the exception of internal haul roads will remain in agricultural production until mine expansion is needed. Once the saleable material has been extracted from an open mining sub phase(s), extraction activities will progress into the next sub- phase(s). At a minimum, at least one Dry Mining and one Dry/Wet Mining phase may be concurrently active at all times with the exception of the first year of extraction activities which only Dry/Wet sub -phase lA will be active. In no case will more than 2 non contiguous 80 acre phases be active at any time. North Dry Mining Phase 1 is estimated to be active in 2014. Extracted material will either be shipped to the AUF by means of haul trucks and conveyors or shipped out at either of the two North Dry Mining access locations. Generally, the access points associated with the North Dry Mining Phases will be used in relation to specific construction projects and will not be utilized for normal retail product sales. This phase will include construction of the internal haul road along the existing rail bed corridor which will provide access to the Akron Avenue/ County Road #42 access location. Once the material has been mined out of Dry Mining Phase 1, mining will continue sequentially throughout the North Dry Mining phases. In order to maintain an internal haul road for access the rail bed internal haul road, it will be necessary to leave portions of retired mine phase(s) un reclaimed for the duration of the North Dry Mining activities. The internal haul roads 26 remaining open within the North Dry Mining phases that connect to the rail bed haul road will be dependent on the actual timing of the signal improvements at CSAH #42 and Biscayne Avenue which are required to be installed prior to the mineral extraction operation can utilize this access. Once the signal improvements are in place and it has been determined by the operator that access onto CSAH #42 at Boulder Trail /Biscayne Avenue is desirable, portions of Future Boulder Trail will be utilized as an internal haul road and will remain open until the Boulder Trial /Biscayne Avenue at CSAH #42 is terminated for mining activities. Once this occurs, the internal haul roads connecting to the rail bed haul road for access to Akron Avenue at CSAH #42 will be reclaimed to interim reclamation grades. Since South Dry Mining Phases 8 -11 will transport 100% of the aggregate material to the AUF, internal haul roads can be relocated as reclamation activities occur. Please refer to the phasing plan for great detail. Dry/Wet Mining activities will occur in two phases. Initially, Dry/Wet Mining activities will occur from the existing grade to not closer than 2 feet from the water table in phases 1A through 2B. Dry/Wet Mining sub -phase 1A is estimated to begin in 2013. Once the overburden material has been relocated, stock piled or utilized for berm construction, mining activities will be initiated by the use of loaders, screens, crushers and conveyors and aggregate material will be transferred to the AUF for material processing. Once it has been determined that mining activities in Dry/Wet Mining Phase 1A have approached the water table but not closer than two feet above the water table, mining activities in 1A will halt and mining will be initiated in Dry/Wet Mining Phase 1B. This will be the phasing sequence through Dry/Wet Mining Phase 2B. A water truck and or portable above ground dust suppression systems will be utilized as needed for dust control. The mine floor in Dry/Wet mining Phases lA 2B will need to remain open and un vegetated for hauling purposes and for the relocation of conveyors and processing equipment as the above water mining activities advance from sub -phase lA through 2B. The second stage of the Dry/Wet mining phases will utilize a dredge, drag lines, backhoes and other equipment capable of extracting material under water. Mineral extraction will occur to approximately 75 feet below the water table. The second stage of the Dry/ Wet mining operation will occur once mining activities have terminated in Dry/Wet Mining Phase 2B. A dredge, draglines, backhoes and other equipment capable of extracting material under water will be setup in Dry/Wet Mining sub- phase IAA and will extract aggregate material below the water table to the approximate contours which are depicted on the End Use Reclamation Plan which will be conveyed to the AUF for material processing. Once the mining has expired in sub- phase IAA, dredging /mining operations will move sequentially to Dry/Wet Mining sub -phase 1 BB then to sub phase 2AA with the final Dry/Wet mining sub -phase 5BB estimated to be complete by 2037. Upon completion of sub- Phases 1A -2BB, the side slopes as depicted on the end use reclamation plan will be constructed and vegetated with an approved seed mix. The remaining side slopes around the lake for Dry/Wet Phases 3AA -4BB will be reclaimed prior to Dry/Wet Mining Phases 5AA -5BB being opened. Within 18 -24 months of being mined out, Dry/Wet/Dry mining Phases 5AA -5BB side slopes for these phases will be reclaimed as per the end use grading plan. It is estimated that the Dry and Dry /Wet Mining phases /sub phases will be active for the following time frames; however, the actual life of each phase will be determined by the actual deposit and market demand for aggregate products throughout the life of the mining operation. Ancillary Use Facility: 2013 2053 100.3 Acres) North Dry Mining Phase 1: 2014 2016 30.30 Acres) Sub phase 1A 07.68 Acres) 27 Sub phase 1B 10.05 Acres) Sub phase 1C 12.57 Acres) North Dry Mining Phase 2: 2016 2019 32.85 Acres) Sub phase 2A 06.82 Acres) Sub phase 2B 08.74Acres) Sub phase 2C 09.17Acres) Sub phase 2D 08.12Acres) North Dry Mining Phase 3: 2019 2021 24.62 Acres) Sub phase 3A 15.68 Acres) Sub phase 3B 08.94 Acres) North Dry Mining Phase 4: 2021- 2023 24.11 Acres) Sub phase 4A 12.19 Acres) Sub phase 4B 11.92 Acres) North Dry Mining Phase 5: 2023 2025 22.35 Acres) Sub phase 5A 13.22 Acres) Sub phase 5B 9.13 Acres) North Dry Mining Phase 6: 2025 2027 17.03 Acres) Sub phase 6A 12.57 Acres) Sub phase 6B 04.46 Acres) North Dry Mining Phase 7: 2027 2028 17.12 Acres) Sub phase 7A 13.30 Acres) Sub phase 7B 03.82Acres) South Dry Mining Phase 8: 2028 2029 39.92 Acres) Sub phase 8A 13.82 Acres) Sub phase 8B 14.70 Acres) Sub phase 8C 11.40 Acres) South Dry Mining Phase 9: 2029 2032 64.66 Acres) Sub phase 9A 25.56 Acres) Sub phase 9B 16.20 Acres) Sub phase 9C 12.91 Acres) Sub phase 9D 9.99 Acres) South Dry Mining Phase 10: 2032 2035 70.92 Acres) Sub phase 10A 22.51 Acres) Sub phase 10B 17.41 Acres) Sub phase 10C 9.67 Acres) Sub phase 10D 21.33Acres) South Dry Mining Phase 11: 2035 2038 61.99 Acres) Sub phase 11A 22.08 Acres) Sub phase 11B 39.91 Acres) Dry/Wet Mining Phase 1: 2013 2018 43.53 Acres) 28 Sub phase 1A 25.32 Acres) Sub phase 1B 18.21 Acres) Dry/Wet Mining Phase 2: 2018 2021 34.93 Acres) Sub phase 2A 17.03 Acres) Sub phase 2B 17.90 Acres) Dry/Wet Mining Phase 1: 2021 2023 43.53 Acres) Sub phase IAA 25.32 Acres) Sub phase 1BB 18.21 Acres) Dry/Wet Mining Phase 2: 2023 2025 34.93 Acres) Sub phase 2AA 17.03 Acres) Sub phase 2BB 17.90 Acres) Dry/Wet Mining Phase 3: 2025 2027 31.77 Acres) Sub phase 3A 15.51 Acres) Sub phase 3B 16.26 Acres) Dry/Wet Mining Phase 3: 2027 2030 31.77 Acres) Sub phase 3AA 15.51 Acres) Sub phase 3BB 16.26 Acres) Dry/Wet Mining Phase 4: 2030 2032 31.79 Acres) Sub phase 4A 15.48 Acres) Sub phase 4B 16.31 Acres) Dry/Wet Mining Phase 4: 2032 2033 31.79 Acres) Sub phase 4AA 15.48 Acres) Sub phase 4BB 16.31 Acres) Dry/Wet Mining Phase 5: 2033 2035 42.94 Acres) Sub phase 5A 24.89 Acres) Sub phase 5B 18.05 Acres) Dry/Wet Mining Phase 5: 2035 2037 42.94 Acres) Sub phase 5AA +1- 24.89 Acres) Sub phase 5BB 18.05 Acres) It is estimated that the majority of extraction activities will occur for at least the initial 25 years from commencement of the Dry Mining and Dry/Wet /Dry phases of the mining operation; however, the actual time period will depend on the market demand for aggregate products. 54. Site Reclamation, Rehabilitation, and Restoration: Interim reclamation will progress in increments; however, the first several years, as the AUF is established and extraction activities are under way, relatively little to no reclamation will occur. If needed for reclamation purposes, contaminant free compactable fill material may be imported to the site as well. At no time will more than two 80 acre areas of contiguous mine area be active. A. North Dry Mining Phases 1 -7 29 Interim use reclamation efforts in North Dry Mining phases /sub phases will occur once hauling and or conveying systems are no longer required within the given sub- phase and mining is initiated in the next sub -phase or prior to opening up more than 80 acres in the North Dry mining area. Upon completion of interim reclamation grading activities, the black dirt will be evenly re spread and will be suitable for agricultural use or will be established with a MNDOT 250 seed mix. As previously mentioned, in order to access the rail bed internal haul routes for access to Akron Avenue at County Road #42 and for access onto Biscayne Avenue, haul road corridors may need to remain open in expired North Dry Mining phases for the duration of utilizing these accesses. At no time will more than 80 acres be open simultaneously in the North Dry Mining phases including those areas utilized for internal haul roads. At a minimum portions of sub- phase lA will need to remain open during the entirety of using Akron Avenue at County Road #42 for access in the North Dry Mining area. The extent to which this internal haul road will need to exist in retired phases is dependent on the signal improvements at Biscayne Avenue at County Road #42. The mining operation will not be permitted to utilize Biscayne Avenue until the signal improvements have been installed. Therefore it is uncertain at this time when the access may switch to the Biscayne Avenue at County road #42 and what North Dry Mining phase (s) will be retired and which phases will be active at the time which the traffic signal improvements have been completed. North Dry Mining activities including interim use reclamation are estimated to be completed within 16 years from the commencement of mining activities in the North Dry Mining phases. If the area is going to be utilized for farming activities prior to development and after mining has expired in any phase(s), interim reclamation grades may be established prior to the establishment of end use grades. Once the North Dry Mining activities are completed if any portion of the North Dry Mining area is to be converted to urban density residential, commercial, or industrial land use, unless some other grading plan is approved by the City, that portion will be graded to the End Use reclamation grades depicted on plan sheets 4.01 and 4.02. on or before 16 years after the effective date of the commencement of mining activities in the North Dry Mining phases, and the establishment of such End Use reclamation grades will be the responsibility of the University or it assignee. B. South Dry Mining Phases 8 -11 South Dry Mining activities will commence once North Dry Mining Phase 7 is under way or in the process of being reclaimed. Since all of the extracted aggregate material in the South Dry Mining phases will be transferred to the AUF, internal haul roads should be able to be relocated within the active mine phases and the internal haul roads located in the expired mine phase(s) should be able to be removed during interim reclamation activities in the expired phases. Upon completion of the interim reclamation grading activities, the black dirt will be evenly re spread and will be suitable for agricultural use or will be established with a MNDOT #250 seed mix. If the University determines that the areas in the South Dry mining phases will be utilized for farming activities for an amount of time before this land is developed, interim reclamation may occur primarily to establish appropriate conditions for farming activities. E.. An end use reclamation plan has not been submitted for South Dry Mining phases 9 -11. Mining Activities in the South Dry Mining phase will not occur until an end use reclamation plan has been approved by the City. The establishment of the end use reclamation grades will be the responsibility of the University or it assignee. C. Dry/Wet Mining Phases 1 -5 In the Dry/Wet Mining phases /sub phases which will remain as a permanent open water /recreational lake feature, the interior mine side slopes will be reclaimed at a 5:1 30 maximum slope and will be established with a MNDOT #340 native seed mix. These slopes will then transition to a 10:1 slope for approximately 50 feet to the edge of the open water from an estimated elevation of 885 down to 880 which will remain a recreational sand/beach area. An additional 10 feet of 10:1 slope will then transition into the lake from the 880 elevation down to an elevation of 879. From that point, a safe angle of repose will be utilized underwater. All areas outside of the lake /beach footprint will be re spread with black dirt and either vegetated and established with a MNDOT #340 native seed mix or will be utilized for agricultural purposes. The side slopes along the roadways will be a 2:1 maximum down to the 880 elevation. From the 880 elevation to an elevation of 874 the slopes will be a max of 2:1 for the first 12 feet and then will transition into a safe angle of repose. The lake side slopes which are adjacent to roadways and interior side slopes will be established with an MNDOT #340 native seed mix down to the shoreline. However, 50 feet of the 10:1 slope measured from the shoreline up to and approximate elevation of 885 will remain as a recreational sand/ beach area. Permanent diversion dikes will be established around the perimeter of the lake boundaries located at the top of lake side slopes to divert exterior runoff away from the lake. Areas outside of the permanent diversion dike areas will be utilized for agricultural purposes or will be established with a MNDOT #340 native seed mix. D. Ancillary Use Facilities Reclamation activities within the AUF will occur in approximately 41.5 -42 years from the commencement of mineral extraction. Within 18 months of all AUF operations terminating, all structures, sub footings, and equipment will be removed from the site. The site will be graded to meet the approved reclamation plan elevations. Prior to black dirt being re spread across the AUF perimeter, Dakota Aggregates will provide the City with a clean /contaminant free soil certification letter from an appropriate and professional outside consulting firm. Once the site has been certified, the black dirt will be re spread and either vegetated with a general seed mix or will be utilized for farming operations. E. Significant Transportation Corridors Within 24 months of receipt of written notice from the City that Future Boulder Trail and Future Akron Avenue ROW is needed for either roadway or utility construction, mining will be completed within that ROW and the ROW will be reclaimed to the grades approved on the interim reclamation plan. F. Trunk Utility Services Within 24 months of receipt of written notice from the City that public trunk utility services are needed to be constructed within the mining operation, an easement or license in form acceptable to the University will be provided to the City for utility construction, mining will be completed within the easement or license and interim reclamation grades will be established as per the approved interim reclamation grades. G. Water bodies and Drainage Plan The mining operation shall allow for the conveyance of surface water within the approved mining areas as called for in the Surface Water Management plan. H. Interim Reclamation Plan The interim reclamation plan depicts interim reclamation grades for all phases that would allow for agricultural use immediately following reclamation. Generally, the interim 31 reclamation activities will commence within 18 -24 months upon a phase being retired; however, interim reclamation grades will be established prior to additional mineable acreage being open above and beyond the permitted two non- contiguous 80 acre mine phase areas. I. End Use Grading Plan An end use grading plan has been submitted for the North Mining Dry phases as well as for the Dry/Wet mining phases. An end use reclamation plan has not been submitted for South Dry Mining Phases 7 -11. An end use grading plan will need to be submitted and approved by the City prior to extraction activities occurring in South Dry Mining Phases 7 -11. The establishment of the end use reclamation grades in South Dry Mining phases 9 -11 will be the responsibility of the University or its assignee. If any portion of the North Dry Mining area is to be converted to urban density residential, commercial, or industrial land use, unless some other grading plan is approved by the City, that portion will be graded by the University or its assignee to the end use reclamation grades on or before 16 years after the effective date of commencement of mining activities in the North Dry Mining phases. Since the end use in the Dry/Wet mining phases is going to result in a 132 open water feature, end use reclamation grades will be established once the Dry/Wet mining phases have been mined out and the lake side slopes have been established. Within 18 months of the reclamation of each phase, all buildings, structures and plants incidental to that phase of operation shall be dismantled and removed by and at the expense of the operator. J. Haul -back Materials and Operations: Haul back materials may be imported to the mining site and utilized for reclamation activities. All imported fill will be clean and compactable that is able to support urban development. Prior to any haul back activities, the operator will submit a haul back management plan which includes the types of fill to be deposited, where the fill derived from, and what testing of the fill will occur. The test results will be submitted to the City and no haul -back material will be imported to the extraction facility until the City has approved the haul -back material. Glossary 1) Asphalt Plant -used to manufacture asphalt or other forms of coated road stone, sometimes know as blacktop. This facility allows the combination of a number of aggregates, sand, and filler, in the correct proportions, heated and finally coated with a binder. The temperature of the finished product must be sufficient to be workable after transport to the final destination. Increasingly, (RAP) recycled asphalt or aggregate products are used as part of the mix. RAP is introduced after the heating process. 2) Berm -is a level space, shelf, or raised barrier separating two areas. 3) Bathymetric Bathymetric (or hydrographic) charts show lake bottom relief or terrain as contour lines (called depth contours or isobaths) and selected depths (soundings), and typically also provide surface navigational information. 32 4) Construction Aggregates -or simply "aggregate" is a broad category of coarse particulate material used in construction, including sand, gravel, crushed stone, slag, and recycled concrete. Aggregate serves as reinforcement to add strength to the overall composite material. Aggregates are used as a stable foundation with predictable, uniform properties, or as a low cost extender that binds with more expensive cement of asphalt to form concrete. 5) Contaminant Free Compactable Material minus #4 sieve sized material that is free of any toxic /waste impurities suitable for reclamation purposes. 6) Conveying (conveyor) -is a common piece of mechanical handling equipment that moves materials from one location to another. 7) Crushing /Crushing Plant -is a machine or plant designed to reduce large rocks into smaller rocks or gravel. Crushers hold material between two parallel or tangent solid surfaces and apply sufficient force to bring the surfaces together with enough energy within the material being crushed so that its molecules separate from, or change alignment in relation to, each other. 8) Dakota Aggregates LLC -a partnership company consisting of two locally owned companies, Cemstone Products Company, a Minnesota Corporation and Ames Construction Inc., a Minnesota Corporation 9) Dry Mining- mining and excavation area that will take place above the ground water table. 10) Floating Dredge (dredging) -is an activity of mining which is carried out underwater with a machine equipped to excavate material from underwater and bring it to shore where they can be processed into construction grade aggregates. 11) Granular Material generally referred to as fill sand or fill material. This material is generally a size #4 or less and is an excess of sand generally at a mine site. 12) Mineral Extraction -the specifics of mineral extraction or resource extraction depend on the resources being mined, for instance the harvesting of timber is called logging, metal ore or aggregates is called mining. 13) Mining Buffer /Set back -the distance a structure or activity must be from the edge of a lot. 14) Overburden -is the material that lies above an area of economic interest in mining and archaeology; most commonly the rock, soil and ecosystem that lies above the ore body. It is also known as waste or spoil. Overburden is removed during surface mining but is typically not contaminated with toxic components and may be used to restore an exhausted mine. 15) Portable Processing Equipment- equipment designed on a skid or axel assembly which can move from point to point allowing for shorter travel times and reduced emissions. 16) Precast /Cast Concrete Products products such as bridge beams or plank, concrete pipe or culverts that are cast at a facility and later transported to a specific construction site after a proper curing time has been achieved. 17) Ready Mixed Concrete Plant -is a facility that manufactures specifically designed concrete for delivery to a customer's construction site in a freshly mixed or plastic unhardened state. Concrete itself is a mixture of Portland cement, water, and aggregates comprising sand and gravel or crushed stone. Ready Mixed Concrete is bought and sold by volume usually cubic yards. Ready Mixed Concrete can be custom made to suit different applications. 18) Reclamation/End Use process of creating useful landscapes that meet a variety of goals. It includes all aspects of this work, including material placement, stabilizing, capping, regarding, and placing cover soils, re- vegetation, and maintenance. 33 19) Recycled Asphalt and or Aggregate Products (RAP) -re- crushing, sizing and screening of left over or demolished concrete or asphalt products. These products are recycled (reproduced) and reused in production of new products or road base products used on construction sites. 20) Screening /Screening Plant -is a machine that takes granulated material and separates it into multiple grades by particle size. 21) Settlement Basins -a series of basins or ponds which process water flow to allowing enough time for water solids to settle out prior to being recirculated into the process. Ponds or basins are then cleaned and the solids are used in land reclamation. 22) Staging (staging area)- setting up of equipment or a truck fleet in preparation for a day's activity. 23) Stockpiling -is a pile or storage location for bulk materials, forming part of the bulk material handling process. Stockpiles are normally created by a stacking conveyor. Stockpiles are normally used in refineries, ports, and mine sites. 24) Relocation of surface soils- Removing topsoil (black dirt), clay, timber, brush and waste aggregate products from the top of the mining deposit to expose the quality sand and gravel needed in the production of high quality construction aggregates. 25) Ton of Material -a U.S. short ton of material consists of 2000 pounds 26) Topsoil -is the upper outermost layer of soil, usually in the top 2 to 8 inches. It has the highest concentration of organic matter and is where most of the earth's biological soil activity occurs. 27) Truck Scale -a platform device that a truck will drive onto for weighing to insure that the truck is of legal weight and or dimension. 28) UMore Park -is a 5,000 acre parcel of land owned by the University of Minnesota. The University has developed a master plan for the site in which a portion of the site will be mined for sand and gravel. 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I 1 b I N b b r IJ� b I. o o t o J. o t? b b I r h 1!� t1 I Q 1. -r, 1t Q 1 b h j am_ ate, b I 0401 r, 4 ;`,NI (1 x b k h b y I b 1. b 'b r a4s o s b g I I a b r, ye I 1• t M 1• I� a a b I g b 1. �I E b m j h 1 ".1 i tY b o 111I J 1 yy tt P \..\--2-- i 'l Bbl I, i. o .I ."if' b e r I3 r 888 b 9a1. t; i I bi I I 1 h r e i M r liil�" r 1 r %i'� �1. I L •nvoo i hi t. 0: 0 "7//‘; 1 f ��ppF r r'rd` I II 1 t 1 e 9M 19"1-- f X41M �J7�UJ I �cr 1 1 r 1 III �f, :S. x i Vi a a 1 1 r 1 fir tSL( "u c `f i r /9 rid,* tl UM/a/9 .•V'3000N3 -3NS Il0 -t[SLL UMore Park Large Scale Non Metallic Mineral Extraction Annual Operating Permit Application for Dry/Wet Mining Sub- Phase 1A UMore Park City of Rosemount June 26, 2012 1. Legal Description of the Land upon which Excavation is Proposed: That part South Half of Section 28, Township 115, Range 19, Dakota County, Minnesota, lying westerly of the following described line; Commencing at the northeast corner of the Southeast Quarter of said Section 28; thence South 89 degrees 48 minutes 43 seconds West, assumed bearing along the north line of said Southeast Quarter, a distance of 1058.90 feet to the point of beginning of the line to be described; thence South 18 degrees 23 minutes 48 seconds West a distance 1211.64 feet; thence South 07 degrees 11 minutes 26 seconds East a distance of 1472.46 feet; thence South 75 degrees 07 minutes 52 seconds East a distance of 126.03 feet to the south line of said Southeast Quarter and there terminating. EXCEPT the plat of UNIVERSITY ADDITION, said Dakota County. AND Section 33, Township 115, Range 19, Dakota County, Minnesota; EXCEPT the East 133.00 feet of the North 549.43 feet of the Southeast Quarter of said Section 33; EXCEPT the East 133.00 feet of the South 930.25 feet of the Northeast Quarter of said Section 33; also EXCEPT that part of said Northeast Quarter described as follows: Beginning at the northeast corner of said Northeast Quarter; thence South 00 degrees 11 minutes 58 seconds West, assumed bearing along the East line of said Northwest Quarter, a distance of 800.63 feet; thence North 81 degrees 23 minutes 25 seconds West a distance of 40.76 feet; thence North 38 degrees 17 minutes 54 seconds West a distance of 819.06 feet; thence North 75 degrees 07 minutes 52 seconds West a distance of 580.25 feet to the north line of said Northwest Quarter; thence North 89 degrees 51 seconds 14 seconds East, along said north line, a distance of 1111.53 feet to the point of beginning. AND That part of the Northwest Quarter of Section 34, Township 115, Range 19, Dakota County, Minnesota, described as follows: Commencing at the northwest corner of said Northwest Quarter; thence South 00 degrees 11 minutes 58 seconds West, assumed bearing along the west line of said Northwest Quarter, a distance of 800.63 feet to the point of beginning of the land to be described; thence continuing South 00 degrees 11 minutes 58 seconds West, along said west line, a distance of 912.75 feet; thence North 89 degrees 51 minutes 14 seconds East a distance of 647.18 feet; thence North 00 degrees 11 minutes 58 seconds East a distance of 813.16 feet; thence North 81 degrees 23 minutes 25 seconds West a distance of 654.21 feet to the point of beginning. AND 1 That part of the Southwest Quarter of Section 34, Township 115, Range 19, Dakota County, Minnesota, lying southerly of the following described line: Commencing at the northwest corner of said Southwest Quarter; thence South 00 degrees 11 minutes 58 seconds West, assumed bearing along the west line of said Southwest Quarter, a distance of 549.45 feet to the point of beginning of the line to be described; thence South 89 degrees 28 minutes 53 seconds East a distance of 2646.92 feet to the east line of said Southwest Quarter and there terminating And lying westerly, northwesterly and northerly of the following described line: Commencing at the southwest corner of said Southwest Quarter; thence South 89 degrees 42 minutes 10 seconds East, along the south line of said Southwest Quarter, a distance of 2192.17 feet to the point of beginning of the line to be described; thence North 04 degrees 21 seconds 18 seconds East a distance of 142.12 feet; thence North 01 degrees 12 minutes 32 seconds West a distance of 368.88 feet; thence North 01 degrees 58 minutes 09 seconds West a distance of 266.72 feet; thence northeasterly 194.60 feet, along tangential curve, concave to the southeast, having a central angle of 96 degrees 57 minutes 13 seconds and a radius of 115.00 feet; thence South 85 degrees 00 minutes 56 seconds East, tangent to last described curve, a distance of 157.25 feet; thence easterly 99.70 feet, along a tangential curve, concave to the north, having a central angle of 09 degrees 25 minutes 45 seconds and a radius of 605.84 feet; thence northeasterly 100.73 feet, along a reverse curve, concave to the northwest, having a central angle of 56 degrees 01 minutes 50 seconds and a radius of 103.00 feet to the west line of said Southwest Quarter and said line there terminating. DRY /WET MINING SUB -PHASE 1A AREA: 25.32 ACRES 2. Land Owner: Regents of the University of Minnesota UMore Development LLC 230 McNamara Alumni Center 200 Oak Street S.E. Minneapolis, MN 55455 Applicant: Dakota Aggregates, LLC 2025 Centre Pointe Boulevard, Suite 300 Mendota Heights, MN 55120 (651) 688 -9292 Operator: Dakota Aggregates, LLC 2025 Centre Pointe Boulevard, Suite 300 Mendota Heights, MN 55120 (651) 688 -9292 Dry/Wet Mining Sub- Phase lA Activities related to Dry/Wet Mining sub -phase 1 A will include relocation of surface soils, berm construction, crushing, mixing, screening, stockpiling, aggregate washing, dredging, loading, hauling and conveying of aggregate materials to the Ancillary Use Facility (AUF). Once the 2 overburden material has been relocated, stockpiled or utilized for berm construction, mining activities will be initiated by the use of loaders, screens, and conveyors and aggregate material will be transferred to the AUF for material processing. Once the material is conveyed to the AUF, it will be processed into varying construction grade aggregate products that will be hauled offsite at either the Station Trail /CSAH# 46 access or at the existing Akron Avenue /CSAH# 46 access location. Wet Mining sub -phase lA is estimated to begin in 2013 and will initially utilize only the Station Trail at CSAH #46 access. A berm will be constructed adjacent to the south perimeter of Dry/Wet Mining sub -phase 1A. The public view or right -of -way face of the berm shall be sloped at a maximum ratio of four (4) feet horizontal to one (1) foot vertical. The extraction side of the perimeter berm shall be sloped at a maximum ratio of three (3) feet horizontal to one (1) foot vertical. Upon completion of berm construction, excess black dirt and overburden material will be stockpiled adjacent to the active sub phase. The overburden material will also be utilized to construct temporary diversion dikes around open water areas within the active mine phase in order to divert surface water around the active mining/pit area. Since the berm associated with Dry/Wet Mining sub -phase lA will remain permanently in place for more than 15 years it will be landscaped on the public view right- of —way side with a density of one tree per 625 square feet with a minimum of 66% of the trees being conifers. Permanent Berms will be constructed on a phase by phase basis and in some instances the berm may extend past the required coverage for the active mine phase. In these instances, the installation of trees will occur to the point at which berm construction and landscaping is required to sufficiently screen the active mine phase. All berms constructed will be vegetated with a MNDOT #250 seed mix regardless of whether or not the berm is part of the screening for the active mine phase. The extraction activities in Dry/Wet Mining sub -phase lA will be consistent to those activities within the North and South Dry Mining phases until excavation limits have approached the groundwater elevations. Once it has been determined that mining activities in Dry/Wet Mining sub -phase lA have approached the water table but not closer than two feet above the water table, mining activities in lA will halt and mining will be initiated in Dry/Wet Mining sub -phase 1B. This will be the phasing sequence through Dry/Wet Mining sub -phase 2B. The second stage of the wet mining phases will utilize a dredge, drag lines, backhoes and other equipment capable of extracting material under water. Mineral extraction will occur to approximately 75 feet below the water table. A dredge, draglines, backhoes and other equipment capable of extracting material under water will be setup in Dry/Wet Mining sub phase IAA and will extract aggregate material below the water table to the approximate contours which are depicted on the End Use Reclamation Plan which will be conveyed to the AUF for material processing. Once the mining has expired in sub phase IAA, dredging/mining operations will move sequentially to Dry/Wet Mining sub- phase 1 BB then to sub- phase 2AA with the final wet mining sub- phase 5BB estimated to be complete by 2037. Upon completion of mineral extraction in sub phases IA -2BB, the side slopes as depicted on the End Use Reclamation Plan will be constructed and vegetated with a MNDOT 340 seed mix design prior to mining being initiated in Dry/Wet Mining sub -phase 3A. 3 Extraction activities associated with Dry/Wet Mining sub -phase 1A will be conducted 24 -hours a day 7 days a week. This will allow greater quantities of mineral extraction to occur on an annual basis without causing a nuisance to surrounding properties. Operations in the Dry/Wet mining sub phases will occur from approximately 1/2 1 '/2 miles away from the residences on the north side of County Road 42 which will allow for the mining operation to occur 24 hours a day without disturbing these residents. With the short peak construction season in Minnesota, we will need as much processing time as possible to manufacture significant quantities of aggregate products to meet specifications for public and private projects that will arise over the life of the mining operation. In line with the most recent MNDOT and other local agency guidelines, nighttime and weekend construction activities need to occur in order to avoid peak hour traffic congestion which provides increased safety for the constructions crews. Only equipment utilized daily within an active mine phase will be stored in the active mine phase. All equipment will be stored in an orderly fashion during the hours in which any given phase is not permitted by ordinance to operate. All equipment will be well kept and maintained to high quality standards. Equipment in active mining phases will include scrapers and bulldozers for relocation of surface soils and berm construction and processing equipment, conveyors, loaders, bobcats and a dredge, draglines, backhoes and other equipment capable of extracting material above and under water. A water truck and or portable above ground dust suppression systems will be utilized as needed for dust control. The mine floor in Wet Mining sub phases 1 A 2B will need to remain open and un vegetated for hauling purposes and for the relocation of conveyors and processing equipment as the above water mining activities advance from sub -phase lA through 2B. Lighting that is required for nighttime operations will be shielded to prevent lights from being directed at traffic on public roadways in order to prevent vision of traffic on CSAH #46 and the level of lighting will not exceed 1 lumen at the EIS boundary in order to not disturb the surrounding properties. Noise levels will comply with the regulations established by the MPCA. All stormwater and spill procedures can be found in the attached Dakota Aggregates Storm Water Pollution Prevention Plan (SWPPP) and Spill Prevention, Control and Countermeasures (SPCC) plan. The Hydrogeologic Study Water Monitoring Plan and the Environmental Contingency Plan which both encompass the entire large scale mineral extraction operation are attached. In the Wet Mining phases /sub phases which will remain as a permanent open water /recreational lake feature, the interior mine side slopes will be reclaimed at a 5:1 maximum slope and will be established with a MNDOT #340 native seed mix. These slopes will then transition to a 10:1 slope for approximately 50 feet to the edge of the open water from an estimated elevation of 885 down to 880 which will remain a recreational sand /beach area. An additional 10 feet of 10:1 slope will then transition into the lake from the 880 elevation down to an elevation of 879. From that point, a safe angle of repose will be utilized underwater. All areas outside of the lake /beach footprint will be re spread with black dirt and either vegetated and established with a MNDOT #340 native seed mix or will be utilized for agricultural purposes. The side slopes along the roadways will be a 2:1 maximum down to the 880 elevation. From the 880 elevation to an elevation of 874 the slopes will be a max of 2:1 for the first 12 feet and then will transition into a safe angle of repose. The lake side slopes which are adjacent to roadways and interior side slopes will be established with an MNDOT #340 native seed mix down to the shoreline. However, 50 feet of the 10:1 slope 4 measured from the shoreline up to and approximate elevation of 885 will remain as a recreational sand/ beach area. Permanent diversion dikes will be established around the perimeter of the lake boundaries located at the top of lake side slopes to divert exterior runoff away from the lake. Areas outside of the permanent diversion dike areas will be utilized for agricultural purposes or will be established with a MNDOT #340 native seed mix. 5 22672- 01AOP- TS,Ewa 6/27/2012 12,03PM yy r f w 4 6 g z y f G- 6ws6NNN1 x�"'" .,004w 4t bps 1 tRNM W6f4 g w 4 I i �i i a s `O g I 4 1'3 z Z x K y X in �n �n 1n �n rn x m x N x b 6 c o o i 1 o o mz g o °s rlmbmm�P n 3 w w g p m ;C x'^� i ism m g z 3 E io g r" H ;m a t A m 4.5 m A o 6- z z s m o, n nn s g z o Pi ii' w z° Ai 1.1 8 �m 7 e r r w ...AREM, y o m x _01....-- I r� 1, 0 E g IL__ i 1 Mi 41N1 i n n II! y Tpil M i I '''''8 r IFr 5 rl f ���1 1 N in I O 3 O® I i. x r o mg 's 7 Ey 3 i 1 I fly -1 .N x Z0 A �N gRI s a g *I? 1 6 R co m L s r t r� Pi 0 �'p, y, raft '4 rj A= 1 IF.y tli CI Li I J Rqq I I o CM 0 f z I 00 b y IdLi —1— qA 1 II H ii 5 1 ,tt ig11 mt t g 1,' Et 1 a 1 i '4 f d 3 F 2 t1 g t C s �6 1 ti i:5 d�• t�l F I tt e t FG E9 f SF 4 E 5 i E G S t, g g q i €l, F1141 E i i 1 f i-p Ti i t[gf s •i i E, S d 4 I !iii h� i !,!1,w..11 ,ie 1 l 9{ i R t CS i!i tp Fr.9 1 F g 1 d d d s e ei c 1 ii gE 1` sg i lS [1 N 1. 1 i i l 11 4q 1 dti 1 P 1 1. 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Ai E o y L 9$®1/90 U98 BEx1JY11p11 LAD f809WA !9®®11 COAL NJA ,I I.:7 9 PLANNERS /ENGINEERS /SUR i H N m Fofl ssoo w cn. nu �z s� laY a.. u� w nun p UNIVERSITY OF 1QNNES N r Hwxe (992)890 eoµ F40 (ess 1805 160711 STREET WEST, fl09EYWHT, YN S SOBB -8099 2 N :.„_-1 0 _ �..t O� lr -p al C i O '.4 N N 1 N i 111 4 1:\ st i lt.; "P s k 1°1 :1 'N IA, 0 s ‘W 0 1 tA\tl\ tt‘ 1 1 v` I k 1.` n 1. 1 k i0 1 1 4,0:\ s, .1 �V sir r NwvMMVwvwvwv. 144 C .S.A.H. NO. 46 P 3 9 4 8 C o �iL g i 5 g m '1. 4 11- 2a g m g Bvm -Rig Om ONF. sz a gW 3 2C X41 4 -1 p 2J�Ble101511G i 1 N g 1 �i�b 1� @i� .1 i 1° O i 'O l i ,4 41o c O m.t.i 0 5 4 8 i L^ ii� is S i i 6 i 5 :5 4 9 l 1 i ba1 et �1: %BRO °AI:,' l 9.."� l ro i i! N 1 8 8611 �9 q CSAH. N0. 16 R a o �7�^ din ..I 4 1 1 1 P80 ii. €ial g,1 8P' gal' o s =1 10 1 i m i lr, R BRii 4 lip d mi. 0 0 R g s V R8 0 8 UMore PARK MINING m A ROSEMO T, YWNETA OPERAT James R. Hill, Inc. u N b 5 N o n USE MAIM le EROSION i I OMR PIM ,....I PLANNERS ENGINEERS SURVEYORS G 0 N n 1 N-, z m N i w y m DBMS w lun d O i of 2500 W hr A n 42 WE 120. Buwr.0. W 553A 6 ism EE TY OF MINNES ••.--628,4,--40.-24,1— PHONE (952 )890-6044 FAX (952)890-6244 mos ism MEET wPSr, RosProuxT. W ssoee —eoes UMore Park Large Scale Non Metallic Mineral Extraction Interim Use Permit Application for Aggregate Processing and Recycled Aggregate Production Products UMore Park City of Rosemount June 26, 2012 Ancillary Use Facility Legal Description That part of the Southwest Quarter of Section 34 and the Southeast Quarter of Section 33, all in Township 115, Range 19, Dakota County, Minnesota, described as follows: Beginning at the southwest corner of said Southwest Quarter of Section 34; thence South 89 degrees 42 minutes 10 seconds East, assumed bearing along the south line of said Southwest Quarter of Section 34, a distance of 2192.17 feet; thence North 04 degrees 21 minutes 18 seconds East a distance of 142.12 feet; thence North 01 degrees 12 minutes 32 seconds West a distance of 368.88 feet; thence North 01 degrees 58 minutes 09 seconds West a distance of 266.72 feet; thence northeasterly 112.50 feet, along a tangential curve, concave to the southeast, having a central angle of 56 degrees 02 minutes 58 seconds and a radius of 115.00 feet; thence northerly 56.43 feet, along a non tangential curve, concave to the east, having a central angle of 35 degrees 55 minutes 23 seconds, a radius of 90.00 feet and a chord which bears North 17 degrees 26 minutes 35 seconds West; thence North 00 degrees 31 minutes 07 seconds East, tangent to last described curve, a distance of 206.76 feet; thence northerly 83.26 feet, along a tangential curve, concave to the west, having a central angle of 34 degrees 04 minutes 23 seconds and a radius of 140.00 feet; thence North 56 degrees 26 minutes 44 seconds East a distance of 45.08 feet; thence North 00 degrees 31 minutes 07 seconds East a distance of 299.38 feet; thence North 88 degrees 50 minutes 09 seconds West a distance of 537.90 feet; thence North 01 degrees 06 minutes 55 seconds East a distance of 542.56 feet to the following described line; Commencing at the northwest corner of said Southwest Quarter of Section 34; thence South 00 degrees 11 minutes 58 seconds West, along the west line of said Southwest Quarter of Section 34, a distance of 549.45 feet to the point of beginning of the line to be described; thence South 89 degrees 28 minutes 53 seconds East a distance of 2646.92 feet to the east line of said Southwest Quarter of Section 34 and there terminating. thence North 89 degrees 28 minutes 53 seconds West, along said described line, a distance of 1701.18 feet to said west line of the Southwest Quarter of Section 34; thence South 89 degrees 42 minutes 48 seconds West a distance of 133.00 feet; thence North 89 degrees 25 minutes 32 seconds West a distance of 1911.08 feet; thence South 00 degrees 00 minutes 00 seconds West a distance of 6.69 feet; thence South 24 degrees 59 minutes 14 seconds East a distance of 32.37 feet; thence South 38 degrees 36 minutes 54 seconds East a distance of 58.76 feet; thence South 24 degrees 49 minutes 30 seconds East a distance of 21.39 feet; thence South 08 degrees 35 minutes 01 seconds East a distance of 17.27 feet; thence South 01 degrees 13 minutes 27 seconds East a distance of 55.61 feet; thence South 20 degrees 01 minutes 53 seconds East a distance of 40.77 feet; thence South 20 degrees 03 minutes 43 seconds East a distance of 111.64 feet; thence South 15 degrees 03 minutes 51 seconds East a distance of 118.93 feet; thence South 27 degrees 25 minutes 38 seconds 1 East a distance of 247.59 feet; thence South 21 degrees 09 minutes 19 seconds East a distance of 78.57 feet; thence South 18 degrees 19 minutes 12 seconds East a distance of 190.08 feet; thence South 26 degrees 25 minutes 05 seconds East a distance of 227.06 feet; thence South 46 degrees 46 minutes 51 seconds East a distance of 98.15 feet; thence South 33 degrees 47 minutes 16 seconds East a distance of 171.67 feet; thence South 23 degrees 42 minutes 30 seconds East a distance of 90.20 feet; thence South 17 degrees 56 minutes 04 seconds East a distance of 178.92 feet; thence South 17 degrees 54 minutes 28 seconds East a distance of 132.38 feet; thence South 25 degrees 39 minutes 33 seconds East a distance of 126.20 feet; thence South 30 degrees 29 minutes 59 seconds East a distance of 103.92 feet; thence South 28 degrees 45 minutes 36 seconds East a distance of 250.67 feet to the south line of said Southeast Quarter of Section 33; thence North 89 degrees 34 minutes 22 seconds East, along said south line, a distance of 1060.22 feet to the point of beginning. EXCEPT that part lying southerly of north right of way line of County State Aid Highway No. 46 per DAKOTA COUNTY ROAD RIGHT OF WAY MAP NO. 253 and DAKOTA COUNTY ROAD RIGHT OF WAY MAP NO. 254, according to the recorded plats thereof, Dakota County, Minnesota. OVERALL GROSS AREA (Entire AUF): 171.856 ACRES NET USABLE AREA (Entire AUF): 100.30 ACRES NET USABLE AREA: 43.87 ACRES (Aggregate Processing and Recycled Aggregate Production Products) Land Owner: Regents of the University of Minnesota UMore Development LLC 230 McNamara Alumni Center 200 Oak Street S.E. Minneapolis, MN 55455 Applicant: Dakota Aggregates, LLC 2025 Centre Pointe Boulevard, Suite 300 Mendota Heights, MN 55120 (651) 688 -9292 Operator: Dakota Aggregates, LLC 2025 Centre Pointe Boulevard, Suite 300 Mendota Heights, MN 55120 (651) 688 -9292 Aggregate Processing and Recycled Aggregate Production Products: Aggregate processing consists of extracting and conveying raw aggregate material from the active mine phase to the Ancillary Use Facility (AUF) and processing the raw aggregate into various specifications for construction grade sand and gravel products through the use of processing 2 equipment such as wash plants, screens, conveyors, cone crushers and jaw crushers. Once processed, the aggregate products are stockpiled within the AUF aggregate processing facility and eventually loaded into outbound trucks once sold. Recycled Aggregate Products (RAP) mainly consists of recycled asphalt pavement and recycled concrete products which is produced by removing and reprocessing existing asphalt pavement and /or the demolition of concrete roads and is then recycled to produce various asphalt and concrete products. There will be aggregate and RAP storage and aggregate and RAP material processing in the western portion of the Ancillary Use Facility. Trucks will import and unload used asphalt and concrete materials and then typically re load with finished aggregate products before they leave the site allowing for an efficient two -way haul scenario. Other trucks will enter the site empty and leave with aggregate products that have been extracted from within the mine site and processed in the AUF aggregate processing facility to meet various construction specifications. Initially, approximately 3 -5 acres in the RAP processing facility and approximately 10 -15 acres in the aggregate processing facility will be utilized for production and stockpiling. As production is increased after the first couple of years, additional acreage will be utilized for RAP and aggregate material processing and stockpiling. Prior to RAP and aggregate material production and stockpiling, the surface soils in the areas that will be utilized will be relocated and utilized for berm construction or stockpiled out of the current RAP and aggregate material processing/stockpiling areas for later use in reclamation activities. The RAP and aggregate processing plants will be screened by existing tree coverage along the north side of County Road #46 and along the south side of the 130 acre mining buffer. Moreover, berm construction adjacent to County Road #46 which will be constructed in accordance with Dry /Wet Mining Phase 1A will provide additional screening. A recirculation wash pond system designed to provide water for the washing of material will be built in the southern portion of the aggregate processing area. A pump will deliver water from this pond for the washing of material with this same water subsequently returned to the pond to maintain a closed -loop system. The proposed hours of operation for the aggregate processing and recycled aggregate production are 24 hours a day 7 days a week. Hauling activities associated with this facility will only occur at the AUF access locations with direct access onto CSAH #46. Initially, Station Trail at County Road #46 is the access which will be utilized for the aggregate processing and RAP facility. An internal haul road will be constructed which will connect to Station Trail and will provide internal access to and from the RAP and aggregate processing facilities as trucks access this facility at County Road #46 and Station Trail. At a minimum, the RAP /aggregate processing facility is approximately 1 mile away from the residents located on the North side of County Road #42. With the short peak construction season in Minnesota, we will need as much processing time as possible to manufacture significant quantities of aggregate products to meet specifications for public and private projects that will arise over the life of the mining operation. In line with the most recent MNDOT and other local agency guidelines, nighttime and weekend construction activities need to occur in order to avoid peak hour traffic congestion which provides increased safety for the constructions crews. 3 Lighting that is required for nighttime operations will be shielded to prevent lights from being directed at traffic on public roadways in order to prevent vision of traffic on CSAH #46 and the level of lighting will not exceed 1 lumen at the EIS boundary in order to not disturb the surrounding properties. Noise levels will comply with the regulations established by the MPCA. RAP material will be stored within the AUF which is approximately 70 feet above the water table and is located on a portion of dense glacial till which will act as a barrier to contamination to protect the groundwater from potential leachating of the RAP material. A water truck and or portable above ground dust suppression systems will be utilized as needed for dust control. The AUF aggregate processing and recycled aggregate production area drains to sediment and dry pond basins which will be located within the AUF northeastern boundary. These basins are designed to treat the storm runoff per MPCA permanent volume requirements as well as retain the entire 100 yr storm volume generated by the ultimate AUF build out and the potential Future Akron Avenue extension. The sediment basin will be lined with on -site clay in order to maintain a normal water elevation for treatment. The sediment basins and dry pond basins are designed to be constructed in increments to handle the AUF runoff based on the areas within the AUF that are active. All stormwater and spill procedures can be found in the attached Dakota Aggregates Storm Water Pollution Prevention Plan (SWPPP) and Spill Prevention, Control and Countermeasures (SPCC) plan. The Hydrogeologic Study Water Monitoring Plan and the Environmental Contingency Plan which both encompass the entire large scale mineral extraction operation are attached. Reclamation activities within the aggregate processing and recycled aggregate facility will occur in approximately 41.5 -42 years from the commencement of facility operations. Within 18 months of all aggregate processing and recycled aggregate operations terminating, all structures, sub footings, and equipment will be removed from the site. The site will be graded to meet the approved reclamation plan elevations. Prior to black dirt being re spread across the aggregate processing and recycled aggregate production perimeter, Dakota Aggregates will provide the City with a clean /contaminant free soil certification letter from an appropriate and professional outside consulting firm. Once the site has been certified, the black dirt will be re spread and either vegetated with a general seed mix or will be utilized for farming operations. 4 1M9 96B(ZSB) IXN! 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TIpJ TRAIL G9 ih I8 Xtg Slit 1 Pr I. ,,,,,aTnzio G ^•P *050021000200 Hydrogeologic Study and Water Monitoring Plan UMore Mining Area Dakota County, Minnesota Prepared for Dakota Aggregates July 2012 BARR Hydrogeologic Study and Water Monitoring Plan UMore Mining Area Rosemount, Minnesota Prepared for Dakota Aggregates, LLC July 2012 MI 4700 West 77 Street Minneapolis, MN 55435 -4803 Phone: (952) 832 -2600 B ADE Fax: (952) 832 -2601 Hydrogeologic Study and Water Monitoring Plan UMore Mining Area Rosemount, Minnesota Prepared for Dakota Aggregates July 2012 Table of Contents 1.0 Introduction 1 1.1 Purpose 1 1.2 Site History and Previous Investigations 2 1.3 Report Organization 3 2.0 Description of Proposed Mining Activities 4 2.1 Description of Mining and Operations Locations 4 2.2 Description of Potential Release Scenarios and Spill Response 4 2.3 Rosemount Large Scale Mining Ordinance 6 2.3.1 a) Description of Groundwater Excavation 6 2.3.2 b) Location and Construction Information for Wells within 300 feet of FEIS Boundary6 2.3.3 c) Description of Proposed Fill Activity 6 2.3.4 d) Aquifer Characteristics of Aquifer Affected by Fill Activity 6 2.3.5 e) Description of Impacts of proposed Fill Activity 6 2.3.6 f) Description of Groundwater Monitoring Plan that the Monitoring will Provide Timely Detection of Potential Impacts 6 2.3.7 g) Measures That Will Be Taken to Avoid, Prevent, Contain, and Detect Potential Releases 7 2.3.8 h) Depth to Prairie du Chien Aquifer and Determine the Appropriate Separation between the Mining Activity and Bedrock 7 2.3.9 i) Other Information as the City May Require 7 3.0 Hydrogeologic Setting 9 3.1 Geologic Setting 9 3.1.1 Paleozoic Deposits 9 3.1.2 Quaternary Deposits 10 3.2 Hydrogeologic Setting 10 3.3 Hydrostratigraphy 11 3.4 Aquifer Characteristics 12 3.5 Conceptual Flow Model 12 C: \Users \kcb \Desktop \Dakota Agg UMA GWMP 071812.doc i 3.6 Groundwater Flow Model 13 3.6.1 Predictive Simulations Flow Directions 13 3.6.2 Predictive Simulations Worst Case Scenario Release Evaluation 13 3.6.2.1 Diesel Fuel Release into Groundwater 14 3.6.2.2 Pesticide Tank Rupture into Groundwater Excavation (Mine -Pit Lake) 15 3.7 Monitoring Zones 16 4.0 Monitoring Strategy 17 4.1 Monitoring in the Drinking Water Supply Management Area 17 4.2 Monitoring Other Areas and Protection of Sensitive Receptors 19 4.2.1 Upgradient Monitoring 19 4.2.2 Ancillary Use Facility 20 4.2.3 Drinking Water Supply Wells 20 5.0 Water Monitoring Network 21 5.1 Monitoring Wells 21 5.1.1 Existing Monitoring Wells 21 5.1.2 New Monitoring Wells 22 5.1.2.1 Well Locations and Depths 22 5.1.2.2 Well Construction 22 5.1.2.3 Monitoring Parameters 22 5.1.3 Baseline Monitoring and Statistical Analysis 23 5.2 Surface Water 23 5.3 Monitoring Parameters 24 5.3.1 Monitoring Parameters Not Included in UMA Groundwater Monitoring 24 5.4 Monitoring Frequency 24 5.5 Sample Collection 25 6.0 Laboratory Analysis 27 6.1 Laboratory Procedures 27 6.2 Laboratory Instrument Calibration 27 6.3 Laboratory Quality Assurance 27 6.4 Laboratory Corrective Action 28 7.0 Reporting and Schedule 31 7.1 Reports 31 7.2 Well Construction and Other Data 31 7.3 Schedule 31 8.0 References 32 C: \Users \kcb \Desktop \Dakota Agg UMA GWMP 071812.doc 11 List of Tables Table 1 Existing Water Wells within 300 feet Table 2 Monitoring Well Construction Details Table 3 Analytical Parameters, Methods and Reporting Limits Table 4 Sample Preservation and Holding Times List of Figures Figure 1 Site Location Figure 2 Site Map Sites of Concern and Auxiliary Use Facilities Figure 3 Overview of Mining Activities Figure 4 Wells at or Near the UMA Figure 5 Post Mining Distance between Outwash and Top of Prairie du Chien Figure 6 Local Bedrock Topography Figure 7 Generalized Stratigraphic Column Figure 8 Groundwater Flow Map (Uppermost Saturated Unit) Figure 9 Bedrock Groundwater Flow Map Figure 10 Conceptual Cross Section Figure 11 Groundwater Flow Vectors Figure 12 Particle Traces from Approximate Lake Boundary 2050 Pumping Conditions Figure 13 Groundwater Travel Time Isochrons 2050 Pumping Conditions Figure 14 Diesel Release Simulation Figure 15 Pesticide Release Simulation Figure 16 Jordan Sandstone Aquifer Vulnerability Projected 2050 Drinking Water Supply Management Area Figure 17 Proposed Monitoring Well Locations Figure 18 Surface Water Monitoring Locations C: \Users \kcb \Desktop \Dakota Agg UMA GWMP 071812.doc 111 1.0 Introduction 1.1 Purpose This document contains the surface water and groundwater monitoring plan (Water Monitoring Plan) for the proposed sand and gravel mining area and ancillary use facility (AUF) at the University of Minnesota Outreach, Research, and Experimentation Park (UMore Park) property located within the City of Rosemount, Minnesota (Figure 1). The proposed mining area and AUF are part of the UMore Mining Area (UMA), is located in Section 33 and portions of 28 and 34, Township 115, Range 19W, Dakota County, Minnesota, and comprises approximately 946 acres in the northwestern corner of UMore Park. The UMA was the subject of a Final Environmental Impact Statement (EIS) prepared by the University of Minnesota (www.umorepark.edu). The portion of the UMA that lies within the City of Rosemount is referred to as the Site in this report. Portions of the proposed mining operation will be within the City of Rosemount Drinking Water Supply Management Area (DWSMA). The mining plan and operations have been designed using Minnesota Department of Health (MDH) guidance (Minnesota Rules 4720.5100 -5590) to protect groundwater resources. The groundwater and surface water monitoring strategy presented in this plan focuses on detection and monitoring of potential releases within the mining area. The primary strategy to avoid groundwater and surface water impact includes locating the bulk storage facilities for the petroleum and chemical storage used for production of aggregate products in the AUF. The AUF is located in an area defined by MDH as having low aquifer vulnerability due to the geologic materials (clay till) that are present at this location. The low permeability of the materials in the AUF does not allow a potential release to move outside the storage area before the release can be cleaned up in accordance with the facility response plan known as the Spill Prevention, Control and Countermeasures (SPCC) Plan. The naturally protective character of the geology in the AUF also means that there is very little water available within the soil matrix for monitoring. Therefore, the focus of groundwater quality monitoring is within the mining areas, outside the AUF where monitoring is feasible. The purpose of this plan is to put controls in place to monitor the surface water and groundwater should a release of hazardous substances or petroleum products occur in the UMA and to meet the requirements of the City of Rosemount mining ordinance for a Hydrogeologic Study and a Water Monitoring Plan (Section 9 of the Large Scale Aggregate Mining Study). This Plan also provides information for the establishment of a release detection monitoring network. The network will consist of both groundwater monitoring wells and a surface water monitoring program. This Plan also establishes the baseline monitoring that will be conducted prior to mining and the operational detection monitoring that will be conducted after mining begins. 1.2 Site History and Previous Investigations UMore Park, including the UMA, was once owned by the U.S. Government and was conveyed to the University of Minnesota (University) in 1947 and 1948. UMore Park includes portions of the former Gopher Ordnance Works (GOW), which was constructed and operated from 1942 to 1945 by E.I DuPont de Nemours for the U.S. Government. The vast majority of GOW operations were located over one mile east of the UMA. Most of the UMA, including the Site, was used as buffer land between the GOW operational areas and the City of Rosemount. The Site was primarily used as farmland during GOW operations and after the GOW was decommissioned. There are no University tenant sites and no leased farmland within the UMA. The GOW was established to manufacture smokeless gunpowder, sulfuric acid, and nitric acid for the World War II effort. Dinitrotoluene (DNT), aniline, oleum, dibutyl phthalate (DBP), and diphenylamine (DPA) were imported for use in the smokeless gunpowder manufacturing process. Other potential constituents related to the former GOW include metals, herbicides, asbestos, and volatile and semi volatile organic compounds. None of these processes were located at the Site. By 1946, the GOW had been decommissioned and many of the buildings had been decontaminated and demolished by the federal government. From 2008 to 2010, the UMA was extensively investigated by the University. The UMA and AUF were included in two Phase I Environmental Site Assessments (Peer, 2006; Barr, 2009a) and were the subject of environmental investigations (Barr, 2009b; Barr, 2009c; Barr, 2010a) and an extensive groundwater assessment (Barr, 2009d). Based on these studies, one Site of Concern (SOC) was identified within the Site (Figure 2). The SOC and the AUF were investigated for the substances associated with the GOW and post -GOW land uses and no detections above background or appropriate risk limits were identified (Barr, 2009b; Barr, 2009c, Barr, 2010a). Because no releases of hazardous substances or petroleum products were identified in the UMA, groundwater monitoring wells were sampled for major cations and anions for general characterization purposes. No transformers associated with PCBs or former GOW buildings associated with asbestos containing materials are known or suspected to have existed within the UMA or the AUF. Because agricultural activities are currently on -going and will continue in the non mining portions of the UMA for a while, the use of fuel, fertilizer, and pesticides (related to the agricultural activities) is expected to be concurrent in various parts of the UMA during at least part of the mine operations. Liquid pesticide storage and loading occurs at a University- operated facility located outside the UMA, near the southern boundary of UMore Park. No previous baseline groundwater data has been collected at the Site for on -going activities such as pesticides and petroleum storage /usage. 1.3 Report Organization This report is organized into the following sections: Section 2: Description of Proposed Mining Activities Section 3: Hydrogeologic Setting Section 4: Monitoring Strategy Section 5: Water Monitoring Network Section 6: Laboratory Analysis Section 7: Reporting and Schedule Section 8: References 2.0 Description of Proposed Mining Activities This section provides an overview of the mining area and proposed mining activities. 2.1 Description of Mining and Operations Locations The UMA was divided into areas (phases) that are proposed for active wet and dry mining. The wet and dry mining phases are shown on Figure 3. No portion of the mining area is located within former GOW operational areas or subsequent University tenant sites with contamination. MDH guidance regarding mining within DWSMAs has been used to develop the mining plan and to avoid potential releases of hazardous substances or petroleum products. No permanent bulk storage of fuels or potential contaminants will occur within the mine pit area. The AUF is an area of low aquifer vulnerability that was specifically selected and integrated into the mining plan to be used as a fueling, bulk storage and operations area so that groundwater quality will not be impacted. All permanent fueling and storage areas will be in the AUF which is inherently protective of groundwater and installed with secondary containment systems to prevent releases of petroleum products or hazardous substances to the ground and /or groundwater. Detailed information on the location of petroleum products and hazardous substances within the AUF and spill response procedures are included in the SPCC Plan and are summarized below with respect to the UMA mining phases. Temporary storage of up to 5000 gallons of diesel fuel may be needed during relocation of surface soils stockpiling, as well as crushing, aggregate stockpiling and other seasonal operations. The temporary fuel storage tanks, will be located in areas of moderate to low vulnerability near the mining areas and may be within the DWSMA. The tanks will have secondary containment and will be inspected and managed in accordance with the SPCC Plan. 2.2 Description of Potential Release Scenarios and Spill Response The mining activities will occur within the sand and gravel deposits documented at the UMA (ProSource, 2008) using powered heavy equipment, conveyors and an electric dredge. The possible sources of contamination related to mining operations include small quantities of fuels or oils, from mobile equipment or the underwater electric dredge. A potential larger quantity release (depending on size of portable tank) from a temporary fuel storage tank. Small leaks or drips will be addressed by routine equipment maintenance and inspections. Any leaking equipment on the pit floor will be removed upon discovery of the leak. A worst case failure scenario would include failure of a fuel tank and would be immediately indicated by failure of the equipment and stoppage of operations. Such a release might result in up to 355 gallons of fuel contacting native soil. If this occurs, the released fuel will be contained with sorbent booms and covered with sorbent materials to the extent possible and the spill area will be excavated to remove impacted soil. The impacted soil will be disposed a permitted solid waste facility. Routine groundwater monitoring (discussed later in this plan) will be conducted to verify that response actions successfully addressed the release. The electric dredge operating in the groundwater excavation area does not use petroleum fuel, but will be maintained with lubrication oils and fluids. In the event an equipment failure on the dredge results in a release, these lubrication oils and fluids could drip into the surface water body in the mine pit and result in a sheen. Any visible oil in the water will result in the shutdown of the equipment, inspection of the dredge, and visual inspection of the excavation area. Sorbent booms will be placed to contain the release and skimmer pumps will be available to remove any residual sheen on the water surface. Surface water sampling will be conducted to verify that there are no dissolved constituents near the release area. If petroleum products are detected, additional testing will be performed to assess the extent of the affected excavation (e.g. testing of deeper water intervals within the below -water mining area). A release from temporary storage tank would be into secondary containment where it would be contained and cleaned up in accordance with the SPCC Plan. Because these storage tanks will be located in areas of low to moderate aquifer vulnerability, there is relatively low risk of migration to groundwater before the release is cleaned up. Permanent monitoring is not effective for temporary storage fuel areas because the tanks would be moved seasonally to address operational needs and may not be present during some years. However if a release were to occur, MPCA regulations require that a Limited Site Investigation be conducted and groundwater monitoring be installed at the site of the release to determine if additional corrective measures are required. This monitoring would be in addition to the permanent monitoring proposed in this plan. The groundwater modeling of a worst -case scenario release of diesel fuel are described in Section 3.6.2.1. The results of the modeling indicate that the total BTEX concentration would degrade to a concentration well below the drinking water standard for benzene before the plume could reach the Site boundary and would not reach City of Rosemount water supply wells. This worst case evaluation did not include the required spill response efforts which would significantly reduce the potential for the release to actually reach the groundwater. 2.3 Rosemount Large Scale Mining Ordinance The following subsections have been prepared to specifically address items a) through i) within Section 9 of the Rosemount City Large Scale Mining Ordinance. 2.3.1 a) Description of Groundwater Excavation The operator will extract sand and gravel from the surface over the majority of the UMA. Mining in some areas of the UMA will be conducted below the water table and above the PDC bedrock. The below -water mining will create a mine pit lake approximately 132 acres and dimensions of approximately 2,150 feet by 1,685 feet. The mining above and below the water table will be phased over time as indicated on Figure 3. 2.3.2 b) Location and Construction Information for Wells within 300 feet of FEIS Boundary The locations of all wells at and in the vicinity of the UMA are shown on Figure 4. Available construction data is included in Table 1. 2.3.3 c) Description of Proposed Fill Activity No offsite fill will be placed at or below the water table. Native fine sand and the silt -sized fraction of the materials mined from below -water mining area may be returned at or within the groundwater excavation after the larger aggregate materials are sized and separated. 2.3.4 d) Aquifer Characteristics of Aquifer Affected by Fill Activity No fill activity is proposed for the groundwater excavation areas except native sand. 2.3.5 e) Description of Impacts of Proposed Fill Activity No fill activity is proposed for the groundwater excavation areas except native sand. 2.3.6 f) Description of Groundwater Monitoring Plan that the Monitoring will Provide Timely Detection of Potential Impacts This monitoring plan provides detection monitoring for the mining operation on a variety of timescales depending on the context of a hypothetical release. The primary means of immediate detection of a spill or release from operations will be routine observation, inspections, and training as described in the SPCC Plan. The SPCC plan describes how releases are detected within minutes to hours and immediate response actions and equipment are used to address spills and releases within both the mine area and the AUF. This monitoring plan includes surface water monitoring, which will detect a release within the groundwater excavation within zero to six months from the time of the release and years prior to potential offsite impact. This plan also provides a groundwater monitoring plan that will detect a release in groundwater from the water table on the order of years to hundreds of years before it can reach a potential receptor (downgradient of the Site). The groundwater at the Site moves very slowly and the monitoring wells are positioned for early detection releases of relative to groundwater travel times. Monitoring wells proposed along the downgradient edge of the mining area so that evidence of a release from within the mined area would migrate to the groundwater monitoring network. 2.3.7 g) Measures That Will Be Taken to Avoid, Prevent, Contain, and Detect Potential Releases See sections 2.2 and 2.3.6 above. 2.3.8 h) Depth to Prairie du Chien Aquifer and Determine the Appropriate Separation between the Mining Activity and Bedrock As shown on Figure 5, the depth between the underlying bedrock and the base of mining is 10 to 20 feet. 2.3.9 1) Other Information as the City May Require 1. The City has requested that monitoring wells be located in areas that are no greater than a four- to six -year time of travel from potential release areas and are positioned at locations along flow paths that would allow for efficient detection of a potential release and /or verify that there are no adverse impacts to offsite receptors should a spill occur. The following groundwater modeling simulations and additional information were requested: locations of potential future pumping wells, and modified rates to match current City projections 2. Flow paths and time of travel from the pit area and the groundwater excavation area 3. Well positions relative to those flow paths so that wells are positioned at the depths that would intercept a hypothetical release 4. Reports of worst case scenario simulations of the fate and transport of a spill of petroleum in the mine pit, and a spill of pesticides (typical of current use) into the groundwater excavation 5. Rationale for the parameter list and frequency of monitoring that specifically addresses any parameters that are not included in the proposed groundwater monitoring plan that were included in soil sampling for previous investigations. 3.0 Hydrogeologic Setting This section describes the physical characteristics of the Site and provides information to comply with the Rosemount Mining Ordinance requirement for a "Hydrogeologic Study." As discussed in the Predictive Simulations Report (Barr, 2010b), spills that may occur in the AUF would not travel far from the spill area due to the very slow rate of groundwater movement through the till that underlies the AUF. As discussed later in this section, during the preparation of this Plan, the City of Rosemount requested that potential contaminant releases from or in the vicinity of the proposed mine pit lake be evaluated as well. A potential release to groundwater in the vicinity of the proposed mine pit lake will most likely migrate first to the saturated glacial outwash deposit. 3.1 Geologic Setting The geology at the UMA consists of approximately 20 to 180 feet of unconsolidated glacial deposits overlying an erosional bedrock surface. The general stratigraphic relationships between these units are described in the following subsections. The information used to describe the Site is based on over 150 borings placed as part of previous investigations and publicly available well records. Figure 4 shows a map of all wells within the UMA and within 300 feet of the boundary. Table 1 includes well construction information for these wells. 3.1.1 Paleozoic Deposits The uppermost bedrock units within the UMA and surrounding area consist of Paleozoic Era units. A map of bedrock topography is included on Figure 6. Remnants of the St. Peter Sandstone (St. Peter) are present discontinuously in the UMA and UMore Park. In areas along the southern UMore Park boundary, the St. Peter is within 25 feet of the ground surface. The Prairie du Chien Group (PDC), which underlies the St. Peter, comprises the uppermost continuous bedrock unit in the area and is the uppermost bedrock unit within a bedrock valley that stretches through the UMA (Figure 6). The uppermost two thirds of the PDC are comprised of the Shakopee Formation dolostone; the lower one third is comprised of the Oneota Formation dolostone (MGS, 1990). The PDC and underlying Jordan Sandstone are the uppermost bedrock aquifers in the area and are used locally for crop irrigation and municipal water supply, respectively. Paleozoic bedrock units beneath the Jordan Sandstone include the St. Lawrence Formation (an aquitard or confining layer), the Franconia Formation (an aquifer; recently renamed as Tunnel City Group; Mossier, 2008), the Ironton and Galesville Sandstones (regional aquifers; recently renamed the Wonewoc Sandstone; Mossier, 2008), the Eau Claire Formation (a regional confining unit), and Mount Simon and Hinckley Sandstones (the deepest regional aquifer in the Twin Cities Area). A stratigraphic column showing the uppermost Paleozoic deposits at the UMA is shown on Figure 7. 3.1.2 Quaternary Deposits Dakota County has been glaciated numerous times during the Quaternary Period, resulting in the deposition of unconsolidated glacial sediments above the Paleozoic bedrock deposits. A conceptual stratigraphic column is shown on Figure 7. The surficial soils at the UMA are relatively thin <5 feet thick) and are derived from loess (wind -blown silt) or consist of localized fill associated with post settlement development. In most places, the underlying near surface deposit consists of sand and gravel associated with the Rosemount Outwash Plain (MGS, 2007). Diamicton (clay till) sediments consisting of a mixture of gravel and sand within a fine- grained matrix are present beneath the surficial outwash throughout much of the UMA and UMore Park. The diamicton sediments are mapped as Cromwell Formation till —which is associated with the Superior Lobe and Pierce Formation till, a Pre Sangamon deposit associated with the Winnipeg provenance (MGS, 2007). Other fine grained sediments, including low energy fluvial or lacustrine deposits are present discontinuously within the outwash across the Site. An older, pre -Late Wisconsinan outwash deposit has also been identified within the UMA and was differentiated from the Superior Lobe outwash by its lower gravel content and the presence of iron mottling (ProSource, 2008). This older outwash deposit is directly overlain by either Superior Lobe outwash or till deposits, depending on location. 3.2 Hydrogeologic Setting The depth to groundwater varies from approximately 50 to 60 feet below the ground surface (bgs) in the UMA depending on the surface topography and the slope of the water table. The water table elevation beneath the UMA is approximately 880 feet MSL. The groundwater surface is within Quaternary sediments across most of UMore Park, the exception being the Site boundary where St. Peter Sandstone is present near the ground surface. Where the water table is located within the outwash or the St. Peter, groundwater flow occurs under unconfined conditions. Confined groundwater flow in outwash occurs where overlying till deposits are present at or beneath the water table. The till deposits are likely saturated to at least the elevation of the water table within the surrounding outwash and likely higher due to some slight mounding of recharge on the low permeability material. Groundwater flow is to the east /northeast across UMore Park towards the Mississippi River in both the uppermost stratigraphic unit and in the bedrock as shown on Figures 8 and 9, respectively. The hydraulic horizontal gradient is on the order of 0.003 feet /foot. Measured vertical gradients between screened intervals of nested wells indicate that gradients were generally neutral to downward. Model results (Section 3.6) indicate that the hydraulic gradient has a downward component resulting in flow downward into the PDC and St. Peter bedrock. The position of the nested well in the outwash adjacent to the clay till is indicated as a somewhat stagnant area in the model which would explain the largely neutral gradient at this location relative to the water table (Figure 9). 3.3 Hydrostratigraphy Discussion of the hydrostratigraphy at the UMA and UMore Park focuses primarily on the vertical and lateral extent of the outwash, diamicton, and bedrock units. Generalized cross sections through the UMA are presented on Figures 10 and 11. Geologic data used to develop the cross sections are from the Groundwater Assessment Report (Barr, 2009d), previous investigations (ProSource, 2008), and publicly available information from the Minnesota County Well Index (CWI) (MGS, 2012). The groundwater surface shown on the cross sections approximates the local groundwater contours in the outwash as based on measurements collected on April 3, 2009. The groundwater surface is dashed where it is projected through diamicton deposits. Figure 10 shows the planned total thickness of the Quaternary deposits that will remain above the bedrock when the proposed mining is completed. The approximate extent of diamicton deposits are shown by hatching on Figures 8 and 9. Major observations regarding the stratigraphy at the Site include the following observations: Within the UMA, the outwash deposit ranges in thickness from 15 to 160 feet. In the southwest and east central portions of the UMA, diamicton is present at and below the water table (Figures 10). Within the saturated zone, the diamicton is up to 100 feet thick and is laterally continuous over distances ranging from one half to two miles. The diamicton is generally underlain by at least 10 feet of outwash, however, in some places diamicton directly overlies bedrock (Figure 10). Knobs of St. Peter Sandstone are generally in direct connection with the glacial outwash (Figure 10). The PDC is the uppermost bedrock unit in apparent bedrock valleys (Figures 10 and 11). 3.4 Aquifer Characteristics The majority of mining activity at the Site will occur above the water table. However, in areas where excavation will occur below the water table, the mining will be within the outwash aquifer. Based on the results of pumping tests and single well tests, hydraulic conductivity in the outwash ranges from 1.6 to 290 feet /day (Barr, 2009). Vertical hydraulic conductivity in the outwash estimated from pumping test data is on the order of 100 feet /day. Hydraulic conductivity of the clay till is 7.7 x10 feet /day. The hydraulic conductivity of the St. Peter Sandstone is estimated to be on the order of 1 foot /day. Horizontal average linear velocities (groundwater flow rates) are approximately 3.5 feet /day assuming a hydraulic conductivity of 290 feet per day, porosity of 0.25, and horizontal gradient of 0.003. For hydraulic conductivity of 1.6 feet per day, the flow rate would be 0.02 feet per day. 3.5 Conceptual Flow Model The conceptual site model is based on geologic and hydrogeologic data collected within the UMA and surrounding area during multiple investigations. This conceptual model is used as the basis for the development of the groundwater flow model discussed in Section 3.6. The geology at the UMA and UMore Park consists of Paleozoic bedrock units overlain by Quaternary glacial sediments. The contact between the bedrock and glacial deposits is an erosional surface that varies from bedrock highs within 10 to 20 feet of the ground surface in the southeast corner of UMore Park to an approximately 200 foot -deep bedrock valley which spans UMore Park from the southwest to the northeast. Bedrock highs are capped with remnants of St. Peter Sandstone, a fine grained, poorly- to well- cemented sandstone deposit. The PDC underlies the remnant St. Peter and is in contact with the Quaternary deposits within the limits of the bedrock valley. The Quaternary sediments, from oldest to youngest, include outwash and a sequence of Pre Sangamon till deposits interpreted to be of the Pierce Formation, outwash consisting of sand and gravel deposits associated with the Superior Lobe (Cromwell Formation), and a thin mantle of loess at the ground surface. Figure 10 is a conceptual cross section showing groundwater flow within UMore Park. The presence of a thick sequence of diamicton deposits is anticipated to influence groundwater flow direction in the immediate vicinity of the diamicton. The hydraulic conductivity of the diamicton is estimated to be approximately six orders of magnitude less than the outwash. Due to the contrast in hydraulic conductivities between the outwash and the diamicton, groundwater likely flows beneath or around the diamicton deposits and, to a lesser extent, through the deposit. 3.6 Groundwater Flow Model A three dimensional steady state groundwater flow model was developed based on the investigation of the Site. The groundwater model was used to characterize the flow system and test future mining scenarios. The calibrated model development is described by Barr (2009d) and in the Predictive Simulations Report (Barr, 2010b). The groundwater model was used to select optimum locations for monitoring wells using the flow paths and groundwater vectors predicted by the model under a variety of conditions. 3.6.1 Predictive Simulations Flow Directions The City of Rosemount provided updated locations for three proposed pumping wells (Wells 16 -18) and pumping conditions for the year 2050. Figures 12 and 13 summarizes the pumping scenarios evaluated as requested by the City of Rosemount and shows the position of existing and proposed wells relative to the groundwater flow directions. Figure 11 provides cross sections of flow oriented along the major east -west axis of flow in the model. The model results indicate that groundwater flow paths are typically slow and much of the water moving into the groundwater excavation from the southwest exits to the northeast of the UMA either around or under the thick till sequence located in the east central and southeast portion of the UMA and under the AUF. Because the hydraulic gradient has a downward component, any dissolved contamination would migrate vertically as well as horizontally. Due to slow travel times in groundwater, the monitoring wells must be located both horizontally and vertically to intercept a plume from a potential release. 3.6.2 Predictive Simulations Worst Case Scenario Release Evaluation A release of petroleum in the AUF was evaluated in the Predictive Simulations Report (Barr, 2010b). The AUF is an area of low aquifer vulnerability and is not within the DWSMA. An area of low aquifer vulnerability means that contamination is unlikely to occur in the event of a release because the low permeability of the materials do not allow them to migrate any appreciable distance before they are cleaned up or naturally attenuated. The evaluation indicated that a release of diesel fuel would not reach the sand and gravel aquifer because the plume would reach a steady state relative to the rate of migration and natural processes that would either disperse or degrade the plume before it could move through the low permeability till in the AUF. This worst case simulation used a steady infinite source of petroleum and did not account for the mandated spill response efforts that would contain a release and remove the released materials if it were to occur. At the request of the City of Rosemount, two additional potential contaminant release scenarios were simulated to evaluate the effect of potential groundwater impact in the event of hypothetical spills in the mining area. As shown on Figures 12 and 13, the groundwater flow model indicates that when the proposed mine pit lake is present, the groundwater flow paths with the highest average groundwater flow velocities downgradient of the lake start at the northern end of the lake and approximately 850 feet north of the southern boundary of the UMA. The average groundwater flow velocities along these flow paths are very similar and, for the purposes of the contaminant transport modeling discussed in the following sections, considered to be the same. 3.6.2.1 Diesel Fuel Release into Groundwater The first of these potential release scenarios evaluated the transport from the catastrophic release of diesel fuel in the vicinity of the mine pit lake. This is a conservative scenario that assumes a worst case in that none of the spill response activities required in the SPCC plan are implemented and that the contaminant source concentration remains constant through time. Neither of those assumptions are intended to represent likely conditions but for illustration purposes, those assumptions assume that the modeling is conservatively protective in terms of its predictions. For this scenario, it was assumed that a release would occur in a location near the proposed mine pit lake that is along one of the fastest groundwater flow paths and that all released diesel fuel would reach the water table. As was done for the simulation of the diesel fuel release in the AUF (Barr, 2010b), total benzene, toluene, ethylbenzene and xylenes (BTEX) was modeled because the BTEX compounds are more soluble and mobile than other diesel fuel constituents. The constant source concentration was assumed to be 2.78 mg /L which is the effective solubility of total BTEX in water from diesel fuel (EPA, 2007). The contaminant transport code MPNE1D (Neville, 2004) was used to model the transport along the groundwater flow paths with the highest flow velocities emanating from the proposed mine pit lake. The model results show the predicted steady state (i.e., equilibrium) concentrations along the flow paths. The transport model results are shown on Figure 14. The modeling results indicate that the concentration of total BTEX (the most mobile components of diesel fuel) would be degraded to a concentration well below the drinking water standard for benzene (which is the lowest standard of the BTEX compounds) long before the contaminant plume could reach the closest proposed Rosemount wells. For a release near the northern portion of the proposed mine pit lake, the total BTEX concentration would degrade to a concentration well below the drinking water standard for benzene before the plume could reach the Site boundary. Although the assumption of a catastrophic release, no spill response, and a continuous and constant contaminant source concentration is unrealistic, it provides a useful worst case comparison because if this extreme example poses no risk to the environment than a lesser spill would be expected to have markedly lower or negligible impact. If a spill occurs in the mine -pit lake, spill response would include product recovery with floating booms and skimmer pumps. 3.6.2.2 Pesticide Tank Rupture into Groundwater Excavation (Mine -Pit Lake) Another potential release scenario requested by the City evaluated at a situation in which on -going agricultural activities around the mining or after reclamation could result in a catastrophic release from a liquid pesticide tank. The largest of the pesticide tanks used by the University would be approximately 1,000 gallons, based on current practices (University of Minnesota 2012 email correspondence). The release of an entire tank of pesticide into the groundwater excavation would be a worst case situation because of the lack of soil cover, which would otherwise act to attenuate the pesticide release. An obvious conclusion from this simulation is that the most effective area to monitor for a potential impact to groundwater is the mine -pit lake itself. The University provided a list of agricultural chemical products currently used at the UM ore property. Constituents of the chemical products were compared to the list of agricultural chemicals for which the MDH has identified health -based drinking water standards. Based on this comparison and the solubility of chemicals on the MDH list, dicamba was chosen as the representative chemical for the transport modeling. The source concentration was assumed to be the concentration of dicamba that would result from 1000 gallons of the commercial chemical ClarityTM being spilled into the proposed mine pit lake and completely mixed. This scenario also assumed no biodegradation of dicamba and that the contaminant source concentration is constant through time. The contaminant transport code MPNE 1 D (Neville, 2004) was used to model the transport along the groundwater flow paths with the highest flow velocities emanating from proposed mine pit lake. The results of the transport modeling are shown on Figure 15. Note that the calculated initial concentration of dicamba for this worst case scenario is well below the drinking water standard for dicamba and the concentration would decline to undetectable levels before the dicamba could reach the closest proposed Rosemount wells. For a release near the northern portion of the proposed mine pit lake, the dicamba concentration would decline to an undetectable level before the plume could reach the Site boundary. 3.7 Monitoring Zones The results of the modeling indicate that much of the groundwater flowing through the Site moves within the outwash and around or below the till unit. Therefore, the principal monitoring zone for groundwater leaving the UMA is the lower (deeper) outwash below the glacial till. This suggests that monitoring wells should be positioned so that their screened interval is within the lower portion of the outwash. The water table wells are unlikely to be effective over most of the UMA because a release at the water table would move a significant distance vertically before it can be detected. By the time a release reaches the position of a water table well, there is a significant potential that the detectable constituents may be below the screened interval. No monitoring is proposed within the AUF. The low permeability of the geologic materials (clay till) that are present at this location make it impractical to monitor the groundwater quality in this area because previous investigations have indicated that there is insufficient groundwater moving into the well to allow sampling. However it is this low aquifer productive also does not allow a potential release of petroleum or hazardous substance to migrate any appreciable distance before it can be removed or remediated and makes it an area of low aquifer vulnerability according to the MDH. 4.0 Monitoring Strategy The goal of monitoring at the Site is to provide timely detection of a release so that actions can be taken to prevent impacts to groundwater and protect drinking water supplies. Because a portion of the UMA is located within a Well Head Protection Area (WHPA) and DWSMA, there are special operational and monitoring requirements that will be implemented. Because different types of operations occur in different portions of the site and groundwater flow velocities vary, slightly different monitoring strategies are required for other portions of the UMA as described below. 4.1 Monitoring in the Drinking Water Supply Management Area The WHPA and DWSMA in the vicinity of the UMA are shown on Figure 16. As shown, portions of the UMA are located within the WHPA and DWSMA. There are issues of concerns regarding the proposed mining activities related to this area. These are identified in a Wellhead Protection Issues Guidance document related to Mining Activities prepared by the Minnesota Department of Health, April 2012. The entire project has been designed following the recommendations included in the MDH guidance document. Each of the recommendations from the MDH and the response to the recommendation is summarized below. 1) Movement of disease organism into the aquifer within the time period they remain viable in groundwater: The United States Environmental Protection Agency (USEPA) states human pathogens may remain viable in groundwater for one to two years. At this time, there will not be onsite treatment of sewage and the Site will not have a source of diseased organisms. If a septic system is added, it will only be used by the mining workers and will be contained within the ancillary use facility area. 2) Contamination related to fuel and fuel breakdown products: Permanent fuel storage tanks will be located within the AUF which is not located within the DWSMA. Furthermore, the fuel tanks will be above ground storage tanks and will meet Dakota County and /or Minnesota Pollution Control Agency rules. Additionally, a spill prevention plan with appropriate emergency spill response procedures will be in place for the entire UMA operation including the mine floor and groundwater excavation area. Temporary fuel storage will be in areas of low to moderate aquifer vulnerability. Modeling results indicate that there is very little risk of impact to groundwater from a diesel fuel release within the mine area. Any releases at the Site will be addressed in accordance with MPCA rules and guidelines for a Limited Site Investigation and corrective measures will be implemented including additional monitoring and response activities a the site of the spill or release. Corrective actions are specific to the details and location of a particular spill and will be implemented based on the data collected during investigation of the spill area. 3) Contamination related to storing equipment, wastes, and hazardous materials: No waste materials will be stored or processed in the DWSMA. All wastes generated will be processed in accordance with all applicable state and local requirements. Recycled bituminous materials, if managed in the UMA, will be within the AUF. No land spreading of animal manures, industrial, or municipal sludge will take place within the DWSMA. Small releases related to mobile equipment and generators are possible but will be managed by frequent inspection and surface water and groundwater monitoring will be conducted in the mine areas. Because hypothetical spills are likely to be small and are not related to a particular location on the mine floor if they do occur, groundwater wells must be located far enough away from potential release areas to ensure that they are able to detect a possible plume. Wells that are placed too close to the mine area may miss the dissolved constituents that indicate a release to groundwater. Surface water monitoring of the groundwater excavation is described below. 4) Operation of a bituminous batch plant: No bituminous batch plant will be operated within the DWSMA. 5) Groundwater withdrawal related to mining operations: A relatively minor amount of water will be withdrawn for make -up water related to washing and dust control. Appropriation permitting will be subject to MDNR regulations. 6) Wells in mining areas: A number of existing wells within the mining area are screened within the Quaternary deposits above the Jordan and PDC. Additional monitoring wells will be placed in the outwash upgradient and downgradient of mining areas to detect evidence of a potential release before it can reach the deeper aquifers. The wells will be located so that they will be screened at intervals that are most likely to detect evidence of contaminant migration. Because vertical gradients are generally downward in the UMA, this means that the primary target of monitoring is the lower portion of the outwash above the PDC bedrock. A hypothetical release to surface water would potentially allow dissolved chemical constituents (e.g. petroleum) to migrate into the outwash aquifer. Therefore, the earliest detection monitoring possible at the Site will be via surface water monitoring in the open water portion of the groundwater excavation. Because the surface water will be mixed by mining and wind activity a hypothetical release would tend to disperse into the water body prior to entering groundwater. This means that a single surface water location point will be representative of water quality in the groundwater excavation. 7) Illegal dumping or other uses of mining areas: Access to the mining area will be controlled by berming, locked gates at access points or other appropriate measures to prevent public access and potential use of the area for dumping or disposal. The mining area within the DWSMA will not be used for stockpiling or spreading of animal manure. The active mining area will not be utilized for recreational purposes. 8) Site reclamation: Appropriate Site reclamation plans have been developed that will address how future land use and surface water will be controlled to reduce direct infiltration of contaminants into the aquifer. 4.2 Monitoring Other Areas and Protection of Sensitive Receptors The goal of monitoring at the Site is to provide timely detection of a release so that actions can be taken to prevent impacts to groundwater. This section includes an evaluation of monitoring needs outside the DWSMA. 4.2.1 Upgradient Monitoring In order to assess the potential for contaminants to migrate onto the Site (unrelated to operations in the UMA) at least two upgradient wells will be placed along the western edge of the Site. One of these wells will be screened in the lower portion of the aquifer and the other will be screened at the water table. 4.2.2 Ancillary Use Facility Because the AUF is underlain by thick, low permeability clay till, the risk of groundwater impacts is very low. For this reason it is considered an area of low aquifer vulnerability. In addition, the low permeability of this area makes it difficult to obtain useful groundwater samples. This is because previous investigations have indicated that very little water (which would carry evidence of a release) is available to flow into monitoring wells. The presence of this low permeability till would prevent significant vertical migration of a spill in this area allowing for the spill to be thoroughly contained and cleaned up. Therefore, spill response and containment will provide adequate protection in this area and no groundwater monitoring is proposed for the AUF. 4.2.3 Drinking Water Supply Wells The goal of monitoring is implicitly intended to protect current and likely future City water supply wells. The addition of new drinking water supply wells or changes in groundwater flow patterns may indicate the need for additional monitoring. The need for and types of monitoring required under such circumstances will be addressed on an on -going basis as part of annual review process by the City. A possible means for a release to enter groundwater would be a spill directly into the groundwater excavation. Therefore, surface water and groundwater monitoring of the excavation and nearby area is proposed to protect existing and potential future water supply wells. 5.0 Water Monitoring Network This section describes the program for monitoring groundwater quality and groundwater levels during mining operations. The purpose of the groundwater monitoring plan is to collect data that will be used to assess groundwater flow patterns and detect changes in water quality that might be related to a release from mining or other activities within the UMA. The monitoring focuses on establishing baseline conditions for comparison of future events and on- going detection monitoring where future events are compared to the statistical baseline and upgradient groundwater data. The plan also includes sampling of the surface water within the groundwater excavation. 5.1 Monitoring Wells 5.1.1 Existing Monitoring Wells The UMA groundwater monitoring system will include routine sampling and analysis events to determine if the Site is impacting local groundwater. The groundwater monitoring system at the UMA will include existing monitoring wells constructed at UMore. The monitoring well network will initially consist of the following wells: MW -E2 -209 (upgradient), MW -B1 -001 (upgradient), 208404 (water level only, downgradient), MW -A3 -003 (downgradient). These wells are completed in the water table aquifer within Quaternary deposits in the UMA. The MW well designations were completed as part of the Groundwater Assessment Report associated with the EIS (Barr, 2009d). Well 208404 is a domestic well associated with the University of Minnesota North Beef Farm. Because this well was not constructed as a groundwater monitoring well it will be used for water level data collection only. The locations of these monitoring wells are shown on Figure 17. These monitoring wells will be a part of the long -term groundwater monitoring program associated with the UMA. Well construction details are provided in Table 1. 5.1.2 New Monitoring Wells 5.1.2.1 Well Locations and Depths Additional monitoring wells are proposed at locations shown on Figure 17. These wells are intended to be installed permanently for the purpose of long -term monitoring of groundwater conditions. Wells located downgradient of the groundwater excavation (Figure 17) are positioned along an extension of the glacial till that will not be mined. This feature is important for several reasons. The first is that it provides a location where permanent wells can be placed without having to replace them to accommodate future mining. This maintains continuity in the data collected from the well over time. Secondly, it means that a potential release into the groundwater excavation or nearby mining areas will be diverted downward or around the till body and thereby will effectively "funnel" the release toward the monitoring wells screened in the lower portion of the outwash. Monitoring of the water table is not necessary in this area because very little flow can occur where the till is present, similar to the conditions in the AUF. Other wells shown on Figure 17 are distributed around the mining area to provide release detection and coverage of the mining area at the Site. Upgradient wells are positioned to provide data on ambient groundwater conditions that may be influenced by offsite activities (i.e., agricultural and industrial land use). 5.1.2.2 Well Construction All wells will be constructed in accordance with Minnesota Well Code and Dakota County Well Ordinance requirements for monitoring wells. All wells will be equipped with ten foot -long screens. Unless otherwise prohibited by Well Code, PVC will be used for well construction. Wells completed in the outwash aquifer will be 2 -inch diameter wells. Additional well construction details are provided in Table 2. Technical specifications for wells will be developed prior to construction. All wells and water -level measuring points will be surveyed for location and elevation and referenced to a known benchmark. 5.1.2.3 Monitoring Parameters The monitoring well network will be sampled and analyzed for the parameters in Table 3. The wells will be sampled for the parameters listed below as well as volatile organic compounds (VOCs) and diesel range organics (DRO) on a semiannual (twice per year) basis to address potential spills or releases related to mine operations. Initial sampling events will include nitrates and pesticides to create a baseline to verify that past operations have not resulted in a release of pesticides to groundwater. These parameters may be sampled on a reduced frequency if baseline monitoring indicates that these are not detected in groundwater. Table 4 identifies the sample containers, sample preservation methods, and holding times for each analytical parameter class. The parameters include water level, major ions (calcium, sodium, potassium, magnesium, carbonate bicarbonate, sulfate, and chloride), nitrate, and total dissolved solids (TDS). These parameters provide general water quality information that will be useful in determination of potential changes in water quality that may precede or be associated with a release detection of a particular contaminant. Field parameters to be collected at the time of sampling will include specific conductance, turbidity, temperature, and redox potential. A sampling and analysis plan (SAP) protocol developed for investigations at UMore Park and approved by the MPCA will be adopted for use at the UMA (Barr, 2009e). The SAP includes detailed sample collection procedures, well evacuation, and QA /QC procedures that will be followed for each event. 5.1.3 Baseline Monitoring and Statistical Analysis After a new monitoring well is installed and developed, baseline monitoring will be conducted. Baseline monitoring will consist of collecting groundwater samples for an extended parameter list in Table 3 during four consecutive quarterly monitoring events. The initial baseline monitoring event may be conducted during a routinely scheduled sampling event or as a standalone event as appropriate. The remaining baseline monitoring events will be conducted during the next two consecutive quarterly sampling events. The samples from each well will be analyzed using Sen's trend test to determine if trends are increasing over the first four monitoring events. If a statistically increasing trend is noted, the data from future events will be compared to upgradient data. After eight events are collected with no statistically increasing trend, Shewhart-CUSUM control chart methods may be used. Control charts allow for collection of background data and statistically compare the results from new events to the well's own background dataset. This is the preferred method of statistical analysis (ASTM D6312) because it incorporates natural heterogeneity present at each well and helps avoid false positives. 5.2 Surface Water Surface water monitoring will be conducted at a single monitoring location near the midpoint of the open portion of the groundwater excavation. This location is expected to vary over time because the dimensions and size of the excavation will vary. Samples will be collected during the spring, summer, and fall monitoring events. Anticipated sample locations are shown on Figure 18. 5.3 Monitoring Parameters Theoretical groundwater impacts are expected to be most likely associated with a potential leak or release of petroleum at the mine floor from mobile equipment. Alternatively, small leaks from conveyor motors or mechanized equipment could result in a release of petroleum products. Because the volume of petroleum involved in these operations is small, the risk to groundwater is remote. Therefore, petroleum and related compounds are the priority contaminants of concern at the Site as shown on Table 3. In addition, general water chemistry parameters and agricultural chemicals are also included to detect changes in water quality that may be associated with other land use (i.e., farming) that may occur concurrent with mining. 5.3.1 Monitoring Parameters Not Included in UMA Groundwater Monitoring PCBs and asbestos are not included in the monitoring list because these parameters are not mobile in the environment and are not soluble in water. Furthermore, operations associated with these materials have not been associated with past activities in the UMA nor are they associated with any proposed future activities related to mining. Metals parameters are not included because previous investigations have not indicated evidence of metal contamination within the Site area. Metallic compounds are not associated with future land use activities in the UMA. Gunpowder chemicals were not manufactured or used within the Site and are not associated with proposed future activities. Semi volatile organic compounds (SVOCs) have not been detected in previous investigations within the Site area. Although bituminous materials such as asphalt cement are potential sources of SVOCs these will be managed in the AUF and are unlikely to come into contact with groundwater or surface water. These materials tend to bind with soil materials, and have a low solubility in water therefore they are unlikely to migrate into groundwater or pose a threat to water supplies. 5.4 Monitoring Frequency Typical travel times in groundwater are relatively slow compared to the pace of human activity. This means that groundwater flow traverses the Site on the order of years rather than days or weeks. As such, a semi annual monitoring frequency (once every six months) provides representative samples of groundwater and surface water. An important consideration for groundwater monitoring is that in order for the results of the monitoring to be statistically valid, each sample must be independent of others. This means that the water that was sampled during an event must move completely out of the well bore before another sample can be collected. For a typical 2 -inch diameter monitoring well with an 8 -inch diameter annular space, and a conservative flow rate of 0.02 feet per day (Section 3.4), a single traverse of the 8 -inch (0.67 feet) annular space would be 33 days. The time for the equivalent of three well volumes to traverse the annular space would be 99 days. In more transmissivity portions of the aquifer, transit times may be shorter, therefore sampling every 60 days should be adequate to provide independent samples between monitoring events. 5.5 Sample Collection Groundwater and surface water sampling field services at the Site will be conducted by qualified field staff. Samples will be collected using standard sampling procedures specified by the USEPA and the MPCA. Standard Procedures for Water Quality Monitoring is included in Appendix C. The sampling procedures describe the use of dedicated and non dedicated sampling equipment, field measurements, documentation and reporting, and other pertinent information that collectively provides the analytical laboratory with representative water samples. Wells will be sampled with dedicated bailers or portable pumps. All non dedicated sampling equipment will be decontaminated between samples. Monitoring wells equipped with dedicated bailers may be sampled in order of convenience. The use of dedicated bailers eliminates the potential for cross contamination between network monitoring wells. All other samples will be collected moving from upgradient to sidegradient, to downgradient. Well inspections will be performed during routine monitoring events in accordance with MN Rules 7035.2815 subp. 10 (T). The condition of the well and surrounding area will be observed and recorded on a field information form by the sampling team. 5.6 Response Actions If groundwater or surface water concentrations are verified by statistical testing to be elevated above background levels, additional actions will be required. The nature of the response will depend on the parameters affected and the location(s) of elevated concentrations. Potential actions generally may include increased sampling frequency, additional well installation, and source identification and source removal, as needed. 6.0 Laboratory Analysis 6.1 Laboratory Procedures Analytical measurements of project samples will be conducted in accordance with established methods, procedures, and laboratory standard operating procedures (SOPs). All analytical project work will be performed according to the analytical methods specified in Table 3. Section 6.2.2 of the laboratory Quality Assurance Manual (QAM) provides details regarding training and initial demonstration of competency of laboratory staff. Section 7.5.2 of the laboratory QAM provides information on the laboratory certification program. The laboratory certifications have been included in Appendix C of the Field Sampling Plan for SOCs 1 -3, 6 -8, UMore Mining Area, UMore Park, Dakota County (FSP) (Barr, 2009). 6.2 Laboratory Instrument Calibration Calibration of laboratory equipment will be based on approved written procedures documented as SOPs and based on manufacturer's recommendations and analytical method requirements. The Laboratory QAM provides details regarding the calibration procedures and calibration frequency of all laboratory analytical systems and equipment. Records of calibration, repairs, or replacement will be filed and maintained at the laboratory and will be subject to review. Additional details pertinent to instrument calibration can be found in the laboratory QAM. 6.3 Laboratory Quality Assurance The QC effort for laboratory analysis will meet or exceed those specified in the analytical methodologies utilized (EPA, Standard Methods, ASTM, etc.). The laboratory has a written comprehensive quality assurance /quality control (QA /QC) program which provides rules and guidelines to ensure the reliability and validity of work conducted at the laboratory. The laboratory QA program is documented in the laboratory QAM, which is on file with Barr and with the MPCA. Compliance with the QA /QC program is coordinated and monitored by the laboratory's QA department, which is independent of the operating departments. Minnesota laboratory certification information for Legend and Braun Intertec are included in Appendix C of the FSP. The stated objectives of the laboratory QA /QC program are as follows: Ensure that all procedures are documented, including any changes in administrative and /or technical procedures. Ensure that all analytical procedures are conducted according to sound scientific principles and have been validated. Monitor the performance of the laboratory by a systematic inspection program and provide for a corrective action, as necessary. Collaborate with other laboratories in establishing quality levels, as appropriate. Ensure that all data are properly recorded and archived. All laboratory procedures are documented in writing as either SOPs or method procedures and are edited and controlled by the Laboratory Quality Assurance Officer. Internal QC procedures for analytical services will be conducted by the laboratories in accordance with their SOPs and the individual method requirements in a manner consistent with appropriate U.S. EPA methods. The laboratory utilizes quality control checks with specifications that include the types (sample spikes, surrogate spikes, reference samples controls, and blanks), the frequency, the compounds to be used for sample spikes and surrogate spikes, and the QC acceptance criteria for these checks. The laboratory will document within each data package when either initial and ongoing instrument and analytical QC functions have not been met. Any samples analyzed and determined to be in nonconformance with the QC criteria will be reanalyzed if possible by the laboratory, if sufficient sample volume is available. It is expected that sufficient volume of samples will be collected to allow for reanalysis. 6.4 Laboratory Corrective Action Corrective action in the laboratory may occur prior to, during and after initial analyses. A number of conditions such as broken sample containers, multiple phases, low /high pH readings, and potentially high concentration samples may be identified during sample log -in or just prior to analysis. Following consultation with lab analysts and section leaders, it may be necessary for the laboratory Quality Control Coordinator to approve the implementation of corrective action. The submitted SOPs specify some conditions during or after analysis that may automatically trigger corrective action or optional procedures. These conditions may include dilution of samples, additional sample extract cleanup, automatic reinjection /reanalysis when certain quality control criteria are not met, etc. Corrective actions are required whenever an out -of- control event or potential out -of- control event is noted. The investigative action taken is somewhat dependent on the analysis and the event. Laboratory personnel are alerted that corrective actions may be necessary if: QC data are outside the warning or acceptable windows for precision and accuracy; Blanks contain target analytes above acceptable limits; Undesirable trends are detected in spike recoveries or RPD between duplicates; There are unusual changes in detection limits; Deficiencies are detected by the QA Department during internal or external audits or from the results of performance evaluation samples; or Inquiries concerning data quality are received Corrective action procedures are often handled at the bench level by the analyst, who reviews the preparation or extraction procedure for possible errors, checks the instrument calibration, spike and calibration mixes, instrument sensitivity, and so on. If the problem persists or cannot be identified, the matter is referred to the laboratory supervisor, manager and /or QA department for further investigation. Once resolved, full documentation of the corrective action procedure is filed with the QA department. These corrective actions are performed prior to release of the data from the laboratory. The corrective actions will be documented in both Legend's corrective action report (signed by analyst, section leader and quality control coordinator), and the narrative data report sent from the laboratory to the Barr QA Manager. Corrective action is the process of identifying, recommending, approving and implementing measures to counter unacceptable procedures or out -of quality- control performance which can affect data quality. Corrective action can occur during field activities, laboratory analysis, data review, and data assessment. All corrective actions proposed and implemented will be documented in the regular quality assurance reports to management. Corrective action is only implemented after approval by the project manager or his designee. If immediate corrective action is required, approvals secured by telephone from the project manager should be documented in an additional memorandum. Corrective action will be implemented if it is determined that the data generated does not meet the project objectives. Possible corrective actions might include: 1. No corrective action. 2. Reanalysis of samples. 3. Re- collection and analysis of samples. For noncompliance problems, a formal corrective action program will be determined and implemented at the time the problem is identified. The person who identifies the problem will be responsible for notifying the project manager, who in turn will notify the MPCA. Implementation of corrective action will be confirmed in writing through the same channels. Any nonconformance with the established quality control procedures in the Sampling and Analysis Plan will be identified and corrected in accordance with this section. The MPCA project manager, or their designee, will issue a nonconformance report for each nonconformance condition. Corrective actions will be implemented and documented in the field record book. No staff member will initiate corrective action without prior communication of findings through the proper channels. If corrective actions are insufficient, work may be stopped by stop -work order by the Barr or MPCA Project Manager. 7.0 Reporting and Schedule 7.1 Reports Annual monitoring reports will be submitted to the City that include results of the monitoring activities conducted during the monitoring period, and monitoring data accompanied by information sufficient to establish the reliability, precision, and accuracy of the reported values. Reports will be submitted by March 1 of the year following the monitoring year. Electronic data deliverables (EDD) for groundwater and leachate samples will also be submitted in Barr's EQuIS format. The schedule of the EDD submittals will be consistent with the hard copy report submittals. 7.2 Well Construction and Other Data A monitoring well construction memorandum and updated well map will be submitted to the City upon installation of new wells or in the future annual reports. 7.3 Schedule Well installation and monitoring will proceed upon approval of the mining permit. If the permit is approved in September 2012, baseline sampling of the existing wells will commence immediately. Wells will be installed by November 2012 and the first complete round of samples will be collected in late November or early December 2012. A delay in permitting will result in delays in the above schedule. Subsequent events will be collected by June and November of each subsequent year. o E c.i o rn CO v v 0 .-i v Lc 000 0 CO V 2 v ,‘i 0) m% a 00 00 00 z z z z N z N N VI z N. 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CO N N N 00 CO a T d N .-I .-I .--I I N N N 0 0 .1 0 N N N r1 0 y a E O C R 0l 01 01 01 01 01 01 01 01 01 0) Ol 0) Ol 01 F 3 0 N m O W a a a a a a a a a a a a a a a d N D 0 is C f) 1 1 0 O1 N e-I N •-I 0 00 N N M N N I� O N N 12 O C CO 00 CD 00 t0 a tr, N m N U) 0 M N CO 0 J t0 t0 O CO t0 CO a a O m n t0 Ol a N 0 0 N N M N N c-I .-I 1-1 N m N .--I .-I .-I M Lc N 4 ,r1 to N ,r1 ,r1 ,r1 to L o to In to v1 N v1 to Wp 0 a a a a a a a a a a a a a a a m 0 22 0 O O O O O o o o o o o o O O 2 2 ga00 000000000oo0o O y O I� m to O Oi O M O t0 m 0 kr; m I- 0 N N 4- a N N a O N N N a N �O 0 C LL o ai O 3 CO M 01 N tf) U1 N CO 01 CO N N N. to 0 N r. 7 0 0 0 00 00 0 0 0 .1 .-I 00 0 .1 00 l0 E c d 13 n a a a tc a Lc, .1 0 m a tO tO a -o 0 F2F13 t° 1 oto o00000 a D Z N N N N. N N N N r-1 N c 1 N N N N D 0) m v 0 0 m 0 a) m Cl.. LA rg, t o c Q C 0 v m N O Z o 0 a) a O o o m 0 00 00 O E C 3 0) O 'O E .E E r i O z c= m c 01 a) E c F., a d o al CO V CU W C C 0) 'O M j 00 a) c 0) O C t W C C 0) f Z G O O N C C H 0 C ,p 'm 5 2 N 0 2 o O N .0 M ro L' 4- 3 y c Y O 0 0 v 0, H m V U N O E ti o 3 O a— O- c m a 2 O r N> c V W N O N 2 2 2 a a 0 3 0 o ci., cu tz 000' E 0 0 w 0 N a a `0 3 c E C O o. a m m0 c o c N N J >w Z'- o 2 W z 2 i CA rl CA CI EL- 0 0 0. k -mays'' A t r ®__we E ]k oocZ 2§ a0_ a kc g )k 2 I 7 002 0 j 0 e off«[ »f Ii .27D ICS E N 0 \/0000 �fv z A E E o w ao -Z L. a. 0 g &77 O a 9 g O. 0 |tXXXX 3 0 \2 0 g z \k\\ ad j 00 00 \0000/ /e Table 3 Analytical Parameters, Methods and Reporting Limits Hydrogeologic Study and Water Monitoring Plan UMore Mining Area Rosemount, Minnesota Method (EPA Method MN GW MPCA unless noted Detection Reporting EPA Values DW /GW Parameter CAS Number Matrix otherwise) Limit Limit Test Unit MCLs Table Summary Table General Chemistry (Braun) Nitrate Nitrite as N N +N Water /Liquid SM 4500 NO3 F 0.015 0.020 mg /L 10 Nitrogen, Total Kjeldahl TKN Water /Liquid EPA 351.2 0.15 0.50 mg /L Nitrogen, Total TN Water /Liquid Calculation 0.50 0.50 mg /L Phosphorus, Total 7723 -140 Water /Liquid 365.1 0.0028 0.010 mg /L General Chemistry (Legend) Alkalinity, Bicarbonate as CaCO3 BALKA Water /Liquid SM 2320 B -97 N/A 20 mg /L Chloride 16887 -00 -6 Water /Liquid 9056A 0.0029 0.10 mg /L 250 SWDR Nitrate as N NITA Water /Liquid 9056A 0.02 0.10 mg /L 10 10 HRLMCL 10 MCL Nitrate Nitrite as N N +N Water /Liquid Calc. /9056A 0.03 0.20 mg /L 10 Sulfate 14808 -79 -8 Water /Liquid 9056A 0.024 0.10 mg /L 250 SWDR Solids, Total Dissolved Water /Liquid SM 2540 C -97 N/A 10 mg /L 500 SWDR Metals Arsenic 7440 -38-2 Water /Liquid 6010B 1.1 10 ug /L 10 10 MCL Calcium 7440 -70-2 Water /Liquid 6010B 30 1000 ug/L Iron 7439 -89-6 Water /Liquid 6010B 3.8 50 ug /L 300 SDWR Lead 7439 -92 -1 Water /Liquid 6010B 0.42 3.0 ug /L 15 TT(7) NA Magnesium 7439 -95-4 Water /Liquid 6010B 2.1 1000 ug /L Potassium 7440 -09-7 Water /Liquid 60106 1.6 1000 ug /L Sodium 7440 -23-5 Water /Liquid 6010B 5.3 1000 ug /L Mecury Mercury I 7439 -97 -6 I Water /Liquid I 7470A 1 0.000037 I 0.00020 I mg /L I I 2 MUL Organochlorine Pesticides (Legend) 4,4-DDD 72 -54 -8 Water /Liquid 8081A 0.031 0.40 ug /L 1 HRL93 1 HRL93 4,4 -DDE 72 -55 -9 Water /Liquid 8081A 0.031 0.40 ug /L 1 HRL93 1 HRL93 4,4-DDT 50 -29 -3 Water /Liquid 8081A 0.031 0,40 ug /L 1 HRL93 1 HRL93 a- Chlordane 5103 -71 -9 Water /Liquid 8081A 0.032 0.40 ug /L Aldrin 309 -00 -2 Water /Liquid 8081A 0.033 0.40 ug /L 0.02 HBV97 alpha -BHC 319 -84 -6 Water /Liquid 8081A 0.028 0.40 ug /L 0.06 HBV97 beta -BHC 319 -85 -7 Water /Liquid 8081A 0.031 0.40 ug /L 0.2 HBV97 delta -BHC 319 -86 -8 Water /Liquid 8081A 0.030 0.40 ug /L Dieldrin 60 -57 -1 Water /Liquid 8081A 0.031 0.40 ug /L 0.006 HRLO8 (1) 0.006 HRL09 Endosulfan 1 959 -98 -8 Water /Liquid 8081A 0.032 0.40 ug /L Endosulfan 11 33213 -65 -9 Water /Liquid 8081A 0.032 0.40 ug /L Endosulfan sulfate 1031 -07 -8 Water /Liquid 8081A 0.031 0.40 ug /L Endrin 72 -20 -8 Water /Liquid 8081A 0.033 0.40 ug /L 2 2 HBV97 Endrin aldehyde 7421 -93 -4 Water /Liquid 8081A 0.040 0.40 ug /L Endrin ketone 53494 -70 -5 Water /Liquid 8081A 0.031 0.40 ug /L gamma -BHC (Lindane) 58 -89 -9 Water /Liquid 8081A 0.029 0.40 ug /L 0.2 0.2 HBV97 gamma Chlordane 5566 -34 -7 Water /Liquid 8081A 0.032 0.40 ug /L 2 2 MCL Heptachlor 76 -44 -8 Water /Liquid 8081A 0.031 0.40 ug /L 0.4 0.08 HRL93 0.08 HRL93 Heptachlor epoxide 1024 -57 -3 Water /Liquid 8081A 0.031 0.40 ug /L 0.2 0.04 HRL93 0.04 HRL93 Methoxychlor 72 -43 -5 Water /Liquid 8081A 0.029 0.40 ug /L 40 40 MCL Toxaphene 8001 -35-2 Water /Liquid 8081A 0.29 1.0 ug /L 3 0.3 HRL93 0.3 HRL93 Organochlorine Pesticides (Braun) 4,4" -DDD 72 -54 -8 Water /Liquid 8081B 0.027 0.25 ug /L 1 HRL93 1 HRL93 4,4 -DDE 72 -55 -9 Water /Liquid 8081B 0.027 0.25 ug /L 1 HRL93 1 HRL93 4,4 -DDT 50 -29 -3 Water /Liquid 8081B 0.030 0.25 ug /L 1 HRL93 1 HRL93 a- Chlordane 5103 -71 -9 Water /Liquid 8081B 0.027 0.25 ug /L Aldrin 309 -00 -2 Water /Liquid 8081B 0.029 0.25 ug /L 0.02 HBV97 alpha -BHC 319 -84 -6 Water /Liquid 80816 0.029 0.25 ug /L 0.06 HBV97 beta -BHC 319 -85 -7 Water /Liquid 8081B 0.028 0.25 ug /L 0.2 HBV97 delta -BHC 319 -86 -8 Water /Liquid 8081B 0.024 0.25 ug /L Dieldrin 60 -57 -1 Water /Liquid 8081B 0.027 0.25 ug /L 0.006 HRL08 (1) 0.006 HRL09 Endosulfan 1 959 -98 -8 Water /Liquid 8081B 0.027 0.25 ug /L Endosulfan 11 33213 -65 -9 Water /Liquid 8081B 0.038 0.25 ug /L Endosulfan sulfate 1031 -07 -8 Water /Liquid 8081B 0.029 0.25 ug /L Endrin 72 -20 -8 Water /Liquid 80816 0.027 0.25 ug /L 2 2 HBV97 Endrin aldehyde 7421 -93 -4 Water /Liquid 8081B 0.030 0.25 ug /L Endrin ketone 53494 -70 -5 Water /Liquid 8081B 0.034 0.25 ug /L gamma -BHC (Lindane) 58 -89 -9 Water /Liquid 8081B 0.028 0.25 ug /L 0.2 0.2 HBV97 gamma Chlordane 5566 -34-7 Water /Liquid 8081B 0.027 0.25 ug /L 2 2 MCL Heptachlor 76 -44 -8 Water /Liquid 8081B 0.033 0.25 ug /L 0.4 0.08 HRL93 0.08 HRL93 Heptachlor epoxide 1024 -57 -3 Water /Liquid 8081B 0.028 0.25 ug /L 0.2 0.04 HRL93 0.04 HRL93 Methoxychlor 72 -43 -5 Water /Liquid 8081B 0.022 0.25 ug /L 40 40 MCL Toxaphene 8001 -35 -2 Water /Liquid 8081B 1.0 5.0 ug /L 3 0.3 HRL93 0.3 HRL93 \barr.com \projects \Mpls\23 MN \19\23191101 Dakota Aggregates UMA Permitti \WorkFiles \GW Monitoring Plan \Tables \Table 3 SAP_Legend 6- 18- 12_criteria DRAFT.xls 1 of 3 Table 3 Analytical Parameters, Methods and Reporting Limits Hydrogeologic Study and Water Monitoring Plan UMore Mining Area Rosemount, Minnesota Method (EPA Method MN GIN MPCA unless noted Detection Reporting EPA Values DW /GW Parameter CAS Number Matrix otherwise) Umit Limit Test Unit MCLs Table Summary Table MDA List 1 Pesticides (Braun) EPTC 759 -94 -4 Water /Liquid 8270D 0.16 0.50 ug /L 200 HRL93 200 HRL93 Propachlor 1918 -16 -7 Water /Liquid 8270D 0.21 0.50 ug /L 90 HRL93 90 HRL93 Ethalfluralin 55283 -68 -6 Water /Liquid 8270D 0.2 0.50 ug /L Deisopropylatrazine 1007 -28-9 Water /Liquid 8270D 0.18 0.50 ug /L Trifluralin 1582 -09-8 Water /Liquid 8270D 0.16 0.50 ug /L 5 HBV95 Desethylatrazine 6190 -65-4 Water /Liquid 8270D 0.1 0.50 ug /L Phorate 298 -02 -2 Water /Liquid 8270D 0.14 0.50 ug /L 1 HBV95 Prometon 1610 -18-0 Water /Liquid 8270D 0.086 0.50 ug /L 100 HRL93 100 HRL93 Simazine 122 -34 -9 Water /Liquid 8270D 0.16 0.50 ug /L 4 4 HRLMCL 4 HRL09 Atrazine 1912 -24-9 Water /Liquid 82700 0.12 0.50 ug /L 3 (6) 3 HRLMCL 3 MCL Propazine 139 -40 -2 Water /Liquid 8270D 0.18 0.50 ug /L 10 HBV95 Terbufos 13071 -79 -9 Water /Liquid 8270D 0.13 0.50 ug /L 0.2 HBV95 Fonofos 944 -22 -9 Water /Liquid 8270D 0.16 0.50 ug /L 10 HBV95 Trial late 2303-17-5 Water /Liquid 8270D 0.13 0.50 ug /L 9 HBV95 Metnbuzin 21087 -64 -9 Water /Liquid 8270D 0.17 0.50 ug /L 10 HBV10 (1) 10 HBV10 Dimethenamid 87674 -68 -8 Water /Liquid 8270D 0.14 0.50 ug /L 40 HBV99 Acetochlor 34256 -82 -1 Water /Liquid 82 0.12 0.50 ug /L 9 HRL08 (1) 9 HRL09 Alachlor 15972 -60 -8 Water /Liquid 8270D 0.083 0.50 ug /L 2 5 HRL08 (1) 5 HRL09 Cyanazine 21725 -46 -2 Water /Liquid 8270D 0.17 0.50 ug /L 1 HRL08 (1) 1 HRL09 Metolachlor 51218 -45 -2 Water /Liquid 8270D 0.059 0.50 ug /L 300 HRL11 (1) 300 HBV09 Chlorpyrifos 2921 -88 -2 Water /Liquid 8270D 0.15 0.50 ug /L 20 HBV95 Pendimethalin 40487 -42 -1 Water /Liquid 8270D 0.079 0.50 ug /L 90 HBV95 MDA List 2 Pesticides (Braun) Dicamba 1918 -00 -9 Water /Liquid 8270D 0.16 0.50 ug /L 200 HRL93 200 HRL93 M.P.C.A. 94 -74 -6 Water /Liquid 8270D 0.13 0.30 ug /L 3 HRL93 3 HRL93 2,4 -D 94 -75 -7 Water /Liquid 8270D 0.22 0.50 ug /L 70 70 HRL93 70 HRL93 Triclopyr 55335 -06 -3 Water /Liquid 8270D 0.10 0.50 ug /L _300 HBV99 Pentachlorophenol 87 -86 -5 Water /Liquid 82700 0.18 0.50 ug /L 1 1 HRLMCL 1 MCL 2,4,5 -T.P. 93 -72 -1 Water /Liquid 82700 0.13 0.50 ug /L 50 50 HRLMCL 50 HRL09 /MCL 2,4,5 -T 93 -76 -5 Water /Liquid 8270D 0.069 0.50 ug /L 70 HRL93 70 HRL93 Dinoseb 88 -85 -7 Water /Liquid 8270D 0.097 0.50 ug /L 7 7 HBV97 2,4 -D.B. 94 -82 -6 Water /Liquid 8270D 0.11 0.50 ug /L 60 HBV95 Bentazon 25057 -89 -0 Water /Liquid 8270D 0.12 0.50 ug /L 200 HBV98 Picloram 1918 -02 -1 Water /Liquid 8270D 0.079 0.50 ug /L 500 500 HRL93 500 HRL93 VOCs Water /Liquid 1,1,1,2 Tetrachloroethane 630 -20 -6 Water /Liquid 8260B 0.29 1.0 ug /L 70 HRL93 70 HRL93 1,1,1- Tnchloroethane 71 -55 -6 Water /Liquid 8260B 0.16 1.0 ug /L 200 9000 HRL08 (1) 9000 HRL09 1,1,2,2 Tetrachloroethane 79 -34 -5 Water /Liquid 8260B 0.16 1.0 ug /L 2 HRL94 2 HRL93 1,1,2- Trichloroethane 79 -00 -5 Water /Liquid 8260B 0.19 1.0 ug /L 5 3 HRL93 3 HRL93 1,1,2- Trichlorotrifluoroethane 76 -13 -1 Water /Liquid 8260B 0.25 1.0 ug/L 200000 HRL93 200000 HRL93 1,1- Dichloroethane 75 -34 -3 Water /Liquid 82608 0.15 1.0 ug /L 100 RAA09 (1) 100 RAA09 1,1- Dichloroethene 75 -35 -4 Water /Liquid 82608 0.24 1.0 ug /L 7 200 HRL11 (1) 200 HBV09 1,1- Dichloropropene 563 -58 -6 Water /Liquid 82608 0.14 1.0 ug /L 1,2,3 Trichlorobenzene 87 -61 -6 Water /Liquid 82608 0.35 5.0 ug /L 1,2,3-Trichloropropane 96 -18 -4 Water /Liquid 8260B 0.22 2.5 ug /L 0.003 HBV10 (1) 0.003 HBV10 1,2,4 Trichlorobenzene 120 -82 -1 Water /Liquid 8260B 0.30 5.0 ug /L 70 4 HBV11 (1) 70 MCL 1,2,4 Trimethylbenzene 95 -63 -6 Water /Liquid 8260B 0.072 1.0 ug /L 100 RAA10 100 RAA10 1,2- Dibromo-3- chloropropane 96 -12 -8 Water /Liquid 8260B 0.40 5.0 ug /L 0.2 0.2 MCL 1,2- Dibromoethane (EDB) 106 -93 -4 Water /Liquid 8260B 0.15 2.5 ug /L 0.05 0.004 HRL93 0.004 HRL93 1,2- Dichlorobenzene 95 -50 -1 Water /Liquid 8260B 0.12 1.0 ug /L 600 600 HRL93 600 HRL93 1,2- Dichloroethane 107 -06 -2 Water /Liquid 8260B 0.26 1.0 ug /L 5 1 HBV11 (1) 4 HRL93 1,2- Dichloropropane 78 -87 -5 Water /Liquid 8260B 0.19 1.0 ug /L 5 5 HRL94 5 HRL93 1,3,5- Trimethylbenzene 108 -67 -8 Water /Liquid 8260B 0.11 1.0 ug /L 100 HRL08 100 HRL09 1,3- Dichlorobenzene 541 -73 -1 Water /Liquid 8260B 0.15 1.0 ug /L 600 LHA 1,3- Dichloropropane 142 -28 -9 Water /Liquid 82608 0.16 1.0 ug /L 1,4- Dichlorobenzene 106 -46 -7 Water /Liquid 82608 0.081 1.0 ug /L 75 10 HRL94 10 HRL93 2,2- Dichloropropane 594 -20 -7 Water /Liquid 8260B 0.66 5.0 ug /L 2- Butanone 78 -93 -3 Water /Liquid 82608 0.65 20 ug /L 4000 HRL94 4000 HRL93 2- Chlorotoluene 95 -49 -8 Water /Liquid 82608 0.081 1.0 ug /L 100 LHA 4- Chlorotoluene 106 -43 -4 Water /Liquid 8260B 0.11 1.0 ug /L 100 LHA Acetone 67 -64 -1 Water /Liquid 8260B 3.8 20 ug /L 4000 HRL11 (1) 4000 HBV10 Allyl chloride 107 -05 -1 Water /Liquid 8260B 0.51 5.0 ug /L 30 HRL94 30 HRL93 Benzene 71 -43 -2 Water /Liquid 8260B 0.071 1.0 ug /L 5 2 HRL08 (1) 2 HRL09 Bromobenzene 108 -86 -1 Water /Liquid 8260B 0.082 1.0 ug /L Bromochloromethane 74 -97 -5 Water /Liquid 8260B 0.20 1.0 ug /L 90 LHA Bromodichloromethane 75 -27 -4 Water /Liquid 8260B 0.23 1.0 ug /L 80 (2) 6 HRL93 6 HRL93 (4) \barr.com \projects \Mpls\23 MN \19 \23191101 Dakota Aggregates UMA Permitti \WorkFiles \GW Monitoring Plan \Tables \Table 3 SAP_Legend 6- 18- 12_criteria DRAFT.xls 2 of 3 Table 3 Analytical Parameters, Methods and Reporting Limits Hydrogeologic Study and Water Monitoring Plan UMore Mining Area Rosemount, Minnesota Method (EPA Method MN GIN MPCA unless noted Detection Reporting EPA Values DIN/GIN Parameter CAS Number Matrix otherwise) limit Limit Test Unit MCLs Table Summary Table Bromoform 75 -25 -2 Water /Liquid 8260B 0.26 5.0 ug /L 80 (2) 40 HRL93 40 HRL93 (4) Bromomethane 74 -83 -9 Water /Liquid 8260B 0.32 5.0 ug /L 10 HRL93 10 HRL93 Carbon tetrachloride 56 -23 -5 Water /Liquid 8260B 0.15 1.0 ug /L 5 1 HBV10 (1) 1 HBV10 Chlorobenzene 108 -90 -7 Water /Liquid 8260B 0.20 1.0 ug /L 100 100 HRL93 100 HRL93 Chloroethane 75 -00 -3 Water /Liquid 8260B 0.27 2.5 ug /L RAA08 (3) Chloroform 67 -66 -3 Water /Liquid 8260B 0.15 1.0 ug /L 80 (2) 30 HRLO8 (1) 30 HRL09 (4) Chloromethane 74 -87 -3 Water /Liquid 8260B 0.24 2.5 ug /L 30 LHA cis -1,2- Dichloroethene 156 -59 -2 Water /Liquid 82608 0.12 1.0 ug /L 70 50 HRL08 (1) 50 HRL09 cis -1,3- Dichloropropene 10061 -01 -5 Water /Liquid 8260B 0.18 1.0 ug /L Dibromochloromethane 124 -48 -1 Water /Liquid 82606 0.26 2.5 ug /L 80 (2) 10 HRL93 10 HRL93 (4) Dibromomethane 74 -95 -3 Water /Liquid 82606 0.24 2.5 ug /L Dichlorodifluoromethane 75 -71 -8 Water /Liquid 82608 0.25 5.0 ug/L 700 HRL11 (1) 700 HBV09 Dichlorofluoromethane 75 -43 -4 Water /Liquid 8260B 0.21 1.0 ug /L ND RAA09 RAA09 (3) Ethyl ether 60 -29 -7 Water /Liquid 8260B 0.27 5.0 ug /L 200 RAA10 (1) 200 RAA10 Ethylbenzene 100 -41 -4 Water /Liquid 8260B 0.28 1.0 ug/L 700 50 HRL11 50 HBV10 Hexachlorobutadiene 87 -68 -3 Water /Liquid 8260B 0.42 10 ug /L 1 HRL93 1 HRL93 Isopropylbenzene 98 -82 -8 Water /Liquid 8260B 0.12 1.0 ug /L 300 HRL93 300 HRL93 (2) m,p- Xylene 108 -38 -3 Water /Liquid 8260B 0.57 2.0 ug /L 106 -42 -3 300 HRL10 (1) Methyl isobutyl ketone 108 -10 -1 Water /Liquid 82606 0.40 5.0 ug /L 300 HRL94 300 HRL93 Methyl tert-butyl ether 1634 -04 -4 Water /Liquid 8260B 0.16 1.0 ug /L 70 HBV00 Methylene chloride 75 -09 -2 Water /Liquid 8260B 0.85 5.0 ug /L 5 5 HRLMCL 5 MCL Naphthalene 91 -20 -3 Water /Liquid 82608 0.30 5.0 ug /L 70 HBV11 (1) 300 HRL93 n- Butylbenzene 104 -51 -8 Water /Liquid 82608 0.15 2.5 ug /L n- Propylbenzene 103 -65 -1 Water /Liquid 82608 0.094 1.0 ug /L o- Xylene 95 -47 -6 Water /Liquid 82608 0.19 1.0 ug /L 300 HRL10 (1) p- Isopropyltoluene 99 -87 -6 Water /Liquid 82608 0.14 2.5 ug /L sec Butylbenzene 135 -98 -8 Water /Liquid 82606 0.11 1.0 ug /L Styrene 100 -42 -5 Water /Liquid 8260B 0.21 1.0 ug /L 100 100 MCL tert- Butylbenzene 98 -06 -6 Water /Liquid 8260B 0.091 1.0 ug /L Tetrachloroethene 127 -18 -4 Water /Liquid 8260B 0.28 1.0 ug /L 5 5 HRLMCL 5 HRL09 Tetrahydrofuran 109 -99 -9 Water /Liquid 8260B 0.75 20 ug /L 100 HRL Toluene 108 -88 -3 Water /Liquid 82608 0.10 1.0 ug /L 1000 200 HRL11 200 HBV09 trans -1,2- Dichloroethene 156 -60 -5 Water /Liquid 8260B 0.056 1.0 ug /L 100 100 HBV11 (1) 100 HRL93 trans -1,3- Dichloropropene 10061 -02 -6 Water /Liquid 82606 0.14 1.0 ug /L Trichloroethene 79 -01 -6 Water /Liquid 82606 0.18 1.0 ug /L 5 5 HRLMCL 5 HRL09 Trichlorofluoromethane 75 -69 -4 Water /Liquid 8260B 0.29 1.0 ug /L 2000 HRL93 2000 HRL93 Vinyl chloride 75 -01 -4 Water /Liquid 8260B 0.21 1.0 ug /L 2 0.2 HRLOB (1) 0.2 HRL09 Diesel Range Organics Diesel Range Organics (C10 -C28) DRO Water /Liquid 1 WI DRO j 20 1 100 1 ug /L j I 200 HBV99 (11) Notes: EPA MCLs (2) 1998 Final Rule for Disinfectants and Disinfection By- products: The total for trihalomethanes is 0.08 mg /L. (6) Under review. (7) Copper action level at 1.3 mg /L, Lead action level at 0.015 mg /L TT Treatment technique. MN GW Values Table (1) Value is representative of the lowest exposure duration published in the Minnesota Department of Health Groundwater Values Table. MPCA DW /GW Summary Table (2) While a HRL was promulgated for this chemical, due to research that has become available since the HRLs were promulgated, the MDH no longer recommends the HRL value. (3) Consult with MDH. (4) THM (Total Halo Methanes) total for all THMs combined can not exceed 80 ug /L. 1998 Final Rule for Disinfectants and Disinfectant By- Products. (11) TPH value is based on pyrene as a sun'ogate (MDH memo 10/8/99). \barr.com \projects \Mpls\23 MN \19 \23191101 Dakota Aggregates UMA Permitti \WorkFiles \GW Monitoring Plan \Tables \Table 3 SAP_Legend 6- 18- 12_criteria DRAFT.xls 3 of 3 Table 4 Sample Preservation and Holding Times Hydrogeologic Study and Water Monitoring Plan UMore Mining Area Rosemount, Minnesota Parameter Preservative /Container Type EPA Recommended Volume Holding Time Water Metals HNO to pH <2; 6 months Cool to 6 °C, plastic (250 ml) Mercury 28 days Cool to 6 °C, VOCs HCI to pH <2, glass (set of 3 -40 ml 14 days vials) Total Phosphorus (Total Kjeldahl Nitrogen and H to pH <2; 28 days Nitrate Nitrite as N, if Cool to 6 °C, plastic (250 ml) needed) CI, SO 28 days; Chloride, Sulfate, Nitrate Cool to 6 °C, plastic (60 ml) NO NO as N 48 Nitrite as N hours Bicarbonate Alkalinity as Cool to 6 °C, plastic (1000 ml) Bicarb. AIk.= 14 days; CaCO TDS TDS 7 days Cool to 6 °C, HCI to pH <2, glass (1- 7 days to extraction; DRO Silica Gel liter amber) 47 days collection to analysis Pesticides Cool to 6 °C, glass (1- liter) 7 days to extraction; 40 days to analysis \barr.com \projects \Mpls \23 M■\19 \23191101 Dakota Aggregates UMA Permitti \WorkFiles \GW Monitoring Plan \Tables \Table 4 .doc r \4 LR f j� r 52 1 44' a o i Q i f o lh,S, t 'z,,, 1, t r 11 n _..r :-'"s a s i,.a•__,_ ce r r- r \___I itabe w I W 0 a E 52 D `o P U 1 Y r t• co i PROJECT LOCATION l q F. •,r t t e' f o j t N r o 1 g l N i i Q Dakota Co. fact 1 Vermillion R• er i Yr ll A r I 1 1 Ancillary Use Facility Boundary Figure 1 UMore Mining Area (UMA) MIN UMore Park Boundary SITE LOCATION 4 Hydrogeologic Study and Water Monitoring Plan UMore Mining Area 0 3,000 6,000 12,000 Rosemount, MN 1 Feet Source: MnDOT, MN DNR, Dakota County, Barr, SEH, HKGi. USGS topographic map background downloaded from the U.S. BARR Department of Agriculture, Natural Resources Conservation Service. EmloolniN 1 ik IN 47 1 11isr,.... -.4or I w r LS T i4,. v am it ig- :5,-,, 1,44 !el '5 3 ..„Aimpitf 0 I atik, _Y' C r I t d a.. T tyl I S 1 1 Rem i to b' a 1 ,ro.;• S r i d t 4 ',ray,_. c A� I �J m 1 1 1 r j j X 1 i\ .1 I� 1 Sty( j X' 1 0( 1 1. I 1 j j Imagery: 1945 Markhurd aenai photos outaned from Aero- Metric Inc. O UMore Mining Area (UMA) Q UMore Park Boundary cD Site of Concern (SOC) Boundary Figure 2 L _I Ancillary Use Facility Boundary SITE MAP N SOC AUF LOCATIONS SOC1 Former Railroad "Y" Hydrogeologic Study and SOC2 Forestry Research /Former GOW Storage Water Monitoring Plan SOC3 Ag. Engineering /K Street Dump 0 450 900 1,800 UMore Mining Area SOC4 Former DNT Platform and AOC 3 -DA1 Rosemount, MN S005 Central Services/Former DNT Bunkers (AOC 5) Feet SOC7 Susp. Disposal Area SOC8 Undet. Use Area BARR Source'. Dakota County, Barr, James R. Mill. MKGi. B7 I, St W i, I y r G 1d' I 14 5'n St MINING BUFFER {o 03 7' ROSEMOUNT DRY MINING PHASE 1 t Ty-` 4 C ,1 f.4. E fi F SU B PHASE 1C SUB PHASE1B -RASE IA e 0 t' m yd 12.SJ ACres 10.05 ACros 66 ACros. y., S'!.ls PTA P o ROSEMOUNT DRY MINING PHASE 2 .Y E 2A SUB PHASE 2B SUB PHASE 3C `s El PHASE 2U es ]d ACres 91I ACros e A 1 ^k. ROSEMOUNT ROSEMOUNT DRY MINING DRY MINING PHASE 4 ROSEMOUNT 70 MINING t i r2,- e ,y PHASE 5 PHAS" �j�yJyr Y. f ROSEMOUNT SUB PHASE dB SUB- PHASE.1A 1 a ti 8 DRY MINING a,.A,,. a NASEB 1UBPHPSE SA 119 ?Acres 1319 ACros 6 6 69d ACres RU SEMOUN 1332 Acres 4 S oPHdSE`(1 es ROSEMOUNT DRY MINING t y 1EjfDACraz ROSEMOUNT DRY MINING fl s` PHASEB PHASE 11 111 s r ,u6 HASP 56 see P HASE s E_.� -hl ;.,,,,,,f f .4- ,1 0 a c ]ez AC,e� m YA IUSE fib y j -ROSEMOUNT(DRY M INING f at, 11° h,._i 1 n PH E�!, E.'?i.. UJ S u 9 E�_.w.,..tr cry. 5M l� e SksL 2t i.r SUB PHA (lNE' I A:. r. is ROSEMOUNT SA(OPrI �,Y f ,d :DRY/WET MINING sU6 PH15E e- "x8' c PHASE 5 5AA(w':T1 T t E 2d 89 A:. res LOCATION OF AGGREGATE A r�} PLANT &'ANCILLARY 5 a.E SUB 89 Sl,'e E y -s y SE FACILITIES y' o BER11 JBi0 11 `k Bfl.�4 SUS-PHASE 5 O -PI -ASE SUB PHASE SUB P SE A dB SUB ET) IMBIWET7 31 Aoree 2 B ONET) 1626 Acres 17 SO Acres 18 2 3 ROSEMOUNT ROSEMOUNT ROSEMOUNT ROSEMOUN o RVPYET MINING DRVIWET MINING DRY/WET MINING DRY/WET MINING T 4 PHASE d PHASE J PHASE 2 PHASE.1 .^7"�l SUB-PHASE SUB PHASE SUB -PHASE SUB PHASE ,y Y 1 1 13r SAIEWI ]A(DRY) 1A(ER 1 Sr m 5 B P S E SUB ASE SUB PHASE SUB-PHASE 1 d., v 1 ETI 3AAh /ET) 2AAMETI ,4 'C 103 cres tAA(WE y A 4A1.4H e Z �5 J3 Ac t t 1 4..7 w 160th St W ...eaF x d U I t iwgf Q UMore Mining Area (UMA) Figure 3 Q UMore Park Boundary O OVERVIEW OF MINING ACTIVITIES j Underwater Mining Area Hydrogeologic Study and Water Monitoring Plan UMore Mining Area 0 450 900 1,800 Rosemount, MN Feet BARR e q t r :b 6 *r,M. xr t 4 tR+ w m tei� f� 6rG rrix r x' d �0 "ffA '6.,.,!---"-i-,/ r 7 .r °I'` r t 4 C 1 a B rch S W fi Y)' t 42 r o S g e4 St C l .,-4.,,,. y to s 6j ^w t t -p g Na s� S t .7.- g 4 r r ek ,,,Itipte,ifkr 1 i y �cr A gus a w ;s AJJ�� t o r v-..: r {r n a mt s yw Y f i ,S 9 h� 1 y n t`=� 4. mat c trs I I ff Be c h S tw fi F f �r S K 4Myh'# t. v a r-: fi I t r ..„..,-;:7 y I 47,,, k.)' Yr ayberry- 1• r i o t I ,,a ::Oft 145th StW i� r i /n' r a r r "te e„r Y a i 0t o e b e 8 scayn t t "d t a, ,J r. 'M r"' y f mac✓ p f r e i*w t *`b r°. u 7� h ix tie t,. y,, w 4- i.. .7e4 !.7`<. 4.44' v-?Ci." ak^ few' -wa 4 i y yy mm ti) 7d{L�� .4 *r` i4k L.. 'S.,148th Stt a it ♦`r ��}'6r ,ty'.,. 1 ,X.. r k A t 002 08 4aa ti 00207616. ti 'h j .,e.x. t o yMW -B1 -001 ya e r' r t >i fit. a i 3 Boulder r i t 1• 0010 4 `,1' }a 4, 1 ;tr., i> 207616 i t s y d q„ I t ,.ti a. 3: P s �A f. I' r, s d .i• a t0 XY-r„ y r f� r 00208402 r a DC C2- 208402 1,6 ILA .4 4s r a 1 -i i•i'. ''''I --a- illiiiii: liaiiii&1000 AeLbaS' Q UMore Mining Area (UMA) dA Figure 4 O UMore Park Boundary UMore Mining Area (UMA) 300' Buffer N Wells (County Well Index) Water Monitoring Plan water well UMore Mining Area 0 500 1,000 2.000 Rosemount, MN Feet Source: Dakota County, Barr, James R. Hill, HKGi. Well data ie from the Dakota County Well and Water Management System (WELLMAN), MN County Well BARB Index, and from Bart. MININIMIIII p .f 7. 5` r y,;. �..FA s rr q i m r l a aSa fY a arh r !'r7.I• 6 f �f,, t f r r .I JcP /42nd W ....rr .Ir f T to p r r. w'!r r ,i N pC f t A i n✓ M f r I r a y t C f 14 5 1ry r �(v J l <t t er4* 3 y r R r fir' r s 7S 1' t a tw. Qm 3 F f \e rrr ,r j -v. Beech St W ,v p „,Z,.' r a' f it 1 f p +t '"i” E a .1� 0 r /f ,rf.aerbe r T r f trr .f .r r r O� wr v,r r rr}`rrt s♦ r ...7C ,1 St W -.a+. •..an r ..n ,:-.-tn.: V 145th SI E y 9 f u E E.r 'S+' ,.J.,; sT'!"^'!± ors:, 7'. .s'rM�S� ,p vwb .E" f 'V u p I rte, sark Fir..." d 4 ;0 r fir f 4 D y 0 o N; o ,A. ti s l L J. o A o t err o 4. a -t m" I*« ':r: Imagery 2001i*4erials F 1 Figure 5 UMore Mining Area (UMA) Distance (ft) UMore Park Boundary 14.7 -40.0 POST MINING DISTANCE BETWEEN Underwater Mining Area O 40.1 60.0 N OUTWASH AND PRAIRIE DU CHEIN Hydrogeologic Study and 60.1 80.0 Water Monitoring Plan i f 80.1 100.0 UMore Mining Area 100.1 120.0 0 450 900 1,800 Rosemount, MN INE 120.1 140.0 Feet 140.1 160.0 BARB /111160.1 180.0 1 73 c 7,..................... :50 ....X---"'N i e "T:' -I -_,T2 I /1 1 /7 /i I V T. N V La 5 Irn.ger (j'win UMore Mining Area (UMA) Figure 6 UMore Park Boundary LOCAL BEDROCK TOPOGRAPHY r- N Bedrock Contour ,Q Hydrogeologic Study and Water Monitoring Plan UMore Mining Area 0 1,500 3.000 Rosemount, MN Feet BARR Source: MnDOT, MN DNR, Dakota County, Barr, SEH. E a) cLa Z E E a as D L a) C J w c c 0 o c c a) 0 0 c 0 5 Cr o 0 3 U U as c d as o U U L L L c a) co O 2 U Y Y r CL C N CD N c 3 Q 'a i_ (n J J Q Q Q c am' c c Ur (5 'a E'— 2 o0•a Qarn .e ,c m o it 1_ o 2 o o 0 c N O m c O ct m -0 0 Q 0 a c CL a) in m n a co a c g W o CD ca m L 1.7- Z U a) .p c (n W a) otS c O O CO E Y C as O c L co .E a) Z N o o 0 E 0 a) c a) LL a O c o c L o (1) (n a) C 3 E 7 d J 7 O 6 J U) d U) N 0 c cO c T1, 0 V (n To as n 0 c 0 -CI Vs CD a a 0 o a) N d o C c O a a a f6 co o. 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'1 filL, fi 2 '1' --'1 4 ',F,Tril r al ri I `(j II., s S "''''''\f w' 4 ....;',v ,.y� ,TT£_' rP i 'a t 1 i -e ROSEMOUNT` G a DRY MINING SUB PHASE 5A PHASE 7 SUB -PHASE 6A Ares 22 Acres ROSEMOUNT DRY MINING 121.57 Acres I PHASE 8 SUB -PHASE 7A 1 a t: SUB -PHASE 8A SUB -PHASE 86 SUB -PHASE 8C SUB -PHASE 5B 13.82 Acres 14b70'Ac�es 4 Acres 9.13 Acres =a1 SUB -PHASE 6B i b (§1ENA2X12 7 B 3.82 Acres 1 ii ROSEMOUNT DRY MINING ii PHASE 9 SUB -PHASE 90 SUB PHASE 9E i SUB PHASE( 1 SUB -PHASE 9B r r .25.58Acres 1 t 18:20 Acres l: -9.99 Acres SUB -PHASE t N r 5B(DRY) o SUB -PHASE t o a t>`n 5BB(WET) 1 $w '4§t, "ROSEMOUNT DRY MINING 18.05 Acres �,a PHASE 10 a 'SUB -PHASE 10C I y r 9.67 Acres 3 J SUB-PHASE' 10A SUB- PHASE t ii r 22 Acres y 17 Acres r iT'i s I R OSEMOUNT SUB -PHASE f 'I DRY/WET MINING 5A(DRY) aiiiiiiii a PHASE 5 SUB -PHASE s 5AA(WET) 24.89 Acres i *e SUB -PHASE SUB -PHASE S B PHASE SUB PHASE a 4B(DRY) 36(DRY) 2B(DRY) 1 B( t 'V i SUB -PHASE SUB -PHASE SUB -PHASE 4BB(WET) SUB -PHASE a° 3BB(WET) (WET) e 2BB(WET) 1BB(WET) ti-, 16.31 Acres 16.26 Acres 17.90 Acres 18.21 Acres a `fr ROSEMOUNT I DRY/WET ROSEMOUNT /WET MINING ROSEMOUNT ROSEMOUNT ROSEMOUNT- ASM 1NING 14 /WET MI f PHASE 4 DRY /WET MINING DRY /WET MINING a p PHASE 3 PHASE 2 t SUB -PHASE SUB -PHASE SUB -PHASE SUB -PHASE 4A(DRY) 3A(DRY) 2A(DRY) 1A(DRY) F' SUB -PHASE SUB -PHASE SUB -PHASE 4AA WET 3AA(WET) 2AA(WET) SUB -PHASE 4.,.. 1AA(WET) 15:48 Acres 15 Acres 17.-.03 Acres 25 3VAcres 11� x J t fi ..N� v 3 r M ,e o f t 0 i 11 11 }r N 4 1 y$ 4 2 r W 0 Figure 18 UMore Mining Area (UMA) N SURFACE WATER MONITORING LOCATIONS CI UMore Park Boundary HWater Monitoring Study and Water Monitoring Plan Surface Water Sample Location UMore Mining Area 1 Underwater Mining Area 0 200 400 800 Rosemount, MN Feet BARR SPCC Plan (Spill Prevention, Control and Countermeasures Plan) For Dakota Aggregates Rosemount Facility (1605 160 St. West, Rosemount, MN 55068) Date of Facility's First Plan: June 26 2012 Date of Last Plan Amendment /P.E. Certification: N/A Date of Last Plan Review: June 26 2012 Designated staff person responsible for spill prevention: Pat Bergin EMERGENCY TELEPHONE NUMBERS: Notification Contacts: 1. Environmental Manager, Pat Bergin Office: 651 686 -4221 Cell: 651 238 -5333 2. National Response Center 1- 800 424 -8802 3. Minnesota Duty Officer 651 649 -5451 Clean -up Contractors: 1. West Central Env. Consultants 952 -980 -3247 2. Bay West 612 291 -0456 Local Hospital: 1. United Hospital 612- 220 -8755 1 TABLE OF CONTENTS TABLE OF CONTENTS 2 PROFESSIONAL ENGINEER CERTIFICATION 3 SPILL PREVENTION, CONTROL AND COUNTERMEASURE PLAN MANAGEMENT APPROVAL 3 CERTIFICATION OF THE APPLICABILITY OF THE SUBSTANTIAL HARM CRITERIA CHECKLIST 3 PLAN AMENDMENTS 4 PLAN REVIEW SUMMARY 5 INTRODUCTION 6 FACILITY INFORMATION 8 PAST SPILL EXPERIENCE 9 POTENTIAL EQUIPMENT FAILURES 10 CONTAINMENT AND DIVERSIONARY STRUCTURES 13 DEMONSTRATION OF PRACTICABILITY 16 INSPECTIONS /RECORDS 17 TRAINING 18 SECURITY 19 TANK CAR LOADING /UNLOADING RACKS 20 FACILITY DRAINAGE 21 BULK STORAGE TANKS 22 TRANSFER OPERATIONS 25 ATTACHMENTS: A. Substantial Harm Criteria Determination Checklist B. Plot Plan Sketch C. Drainage Event Records D. Inspection Checklist E. Training Records F. Discharge Notification Form G. Emergency Response Plan and Notifications 2 PROFESSIONAL ENGINEER CERTIFICATION CERTIFICATION: I hereby certify that I have examined the facility and, being familiar with the provisions of 40 CFR Part 112, attest that this SPCC Plan has been prepared in accordance with good engineering practices. Engineer: Patrick Bergin, PE Registration Number: 45080 State: Commonwealth of Minnesota Signature: Date of Plan Certification: SPILL PREVENTION, CONTROL AND COUNTERMEASURE PLAN MANAGEMENT APPROVAL I hereby certify that the necessary resources to implement this Plan have been committed. Upper Management Person (TBD), Title Date CERTIFICATION OF THE APPLICABILITY OF THE SUBSTANTIAL HARM CRITERIA CHECKLIST Please see Attachment A. 3 PLAN AMENDMENTS Date Description of Amendment Name and Signature of Certifying Person Patrick Bergin, PE 4 PLAN REVIEW SUMMARY Review Date Amended (Y or N) Name and Signature of Reviewer NAME 5 INTRODUCTION Spill Prevention, Control, and Countermeasure (SPCC) plans for facilities are prepared and implemented as required by the U.S. Environmental Protection Agency (U.S. EPA) Regulation contained in Title 40, Code of Federal Regulations, Part 112, (40 CFR 112). A non transportation related facility is subject to SPCC regulations if: the total aboveground storage capacity exceeds 1,320 gallons; or the underground storage (UST) capacity exceeds 42,000 gallons; and if, due to its location, the facility could reasonably be expected to discharge oil into or upon the navigable waters or adjoining shorelines of the United States. An SPCC plan is not required to be filed with the US EPA, but a copy must be available for on -site review by the Regional Administrator (RA) during normal working hours. The SPCC plan must be submitted to the US EPA Region 5 RA and the state agency along with the other information specified in Section 112.4 if either of the following occurs: 1. The facility discharges more than 1,000 gallons of oil into or upon the navigable waters of the United States or adjoining shorelines in a single spill event; or 2. The facility discharges oil in quantities that may be harmful in two spill events within any twelve month period. Spill response and notification procedures are described in Attachment G. The following spill information must be reported to the National Response Center (NRC) at 1- 800 424 -8802 within 60 days if either of the above thresholds is reached. This report is to contain the following information: 1. Name of the facility. 2. Name(s) of the owner or operator of the facility. 3. Location of the facility. 4. Date and year of initial facility operation. 5. Maximum storage or handling capacity of the facility and normal daily throughput. 6. Description of the facility including maps, flow diagrams, and topographical map. 7. A complete copy of the SPCC plan with any amendments. 8. The cause(s) of such spill(s), including a failure analysis of system or subsystem in which failure occurred. 9. The corrective actions and /or countermeasures taken, including an adequate description of equipment repairs and/or replacements. 10. Additional preventive measures taken or contemplated to minimize the possibility of recurrence. 6 11. Such other information as the Regional Administrator may reasonably require that is pertinent to the plan or spill event(s). The SPCC plan must be amended within 6 months whenever there is a change in facility design, construction, operation, or maintenance that materially affects the facility's spill potential. The SPCC plan must be reviewed at least once every 5 years and amended to include more effective prevention and control technology, if such technology will significantly reduce the likelihood of a spill event and has been proven in the field. All such amendments must be re- certified by a registered professional engineer (PE). Owners and operators failing or refusing to comply with this federal regulation are liable to a civil administrative penalty of up to $11,000 per day (up to a maximum of $127,500) or judicial civil penalties of up to $27,500 per day. If the owners and operators of a facility required to prepare an SPCC plan are not required to submit a Facility Response Plan, the SPCC plan should include a signed certification form, Attachment A. 7 FACILITY INFORMATION Name: Dakota Aggregates Rosemount Mailing Address: 2025 Centre Pointe Blvd., Suite 300 Mendota Heights, MN 55120 -1221 Street Address: 1605 West 160 St. Rosemount, MN 55068 Owner: Dakota Aggregates, LLC 2025 Centre Pointe Blvd., Suite 300 Mendota Heights, MN 55120 -1221 Facility Contact: Patrick Bergin (651) 686 -4221 Location: ADDRESS Latitude 44 43'2.79 "N_, Longitude 93 5'56.83 "W Facility Description: The Rosemount site contains a sand and gravel mining and processing operation, concrete batch plant, asphalt plant, maintenance garage, recycle aggregates processing (RAP) yard, and a casting yard. See figures 1 and 2 for the mining area and ancillary use facility (AUF) area. Most of the bulk storage and all maintenance pertaining to petroleum products are done within the AUF. Total regulated oil storage capacity: 2,019,550 gallons See Attachment B Plot Plan for the location of the storage tanks and general arrangements of the facility. Also provided on this plan sketch are storm water drain inlets and flow (slope) directions of rain water (and spilled oil paths). 8 PAST SPILL EXPERIENCE (40 CFR 112.7 (a)) No spills have occurred at this facility. 9 POTENTIAL EQUIPMENT FAILURES (40 CFR 112.7(b)) (See Attachment B for tank arrangements and spill flow patterns.) Where experience indicates a reasonable potential for equipment failure (such as loading or unloading equipment, tank overflow, rupture, or leakage, or any other equipment known to be a source of a discharge), include in your Plan a prediction of the direction, rate of flow, and total quantity of oil which could be discharged from the facility as a result of each type of major equipment failure. Mining Area Potential Failure Spill Direction Volume Released Spill Rate Complete failure of a full tank into soil, northeast Up to 4,000 gallons Instantaneous Gradual to Partial failure of a full tank into soil, northeast Up to 4,000 gallons Instantaneous Up to 50 Tank overfill Into soil, northeast Up to 500 gallons gallons /minute Up to 50 Pipe failure N/A N/A gallons /minute Leaking Pipe N/A N/A Gradual Gradual to Tank truck leak or failure Into soil, northeast Up to 2,000 gallons Instantaneous Up to 50 Hose leak during transfer Into soil, northeast Up to 500 gallons gallons /minute Up to 50 Pump rupture or failure Into soil, northeast Up to 500 gallons gallons /minute Aggregate Processing Area Potential Failure Spill Direction Volume Released Spill Rate Complete failure of a full tank East to swale _5,000 gallons Instantaneous Gradual to Partial failure of a full tank East to swale 5,000 gallons Instantaneous Up to 50 Tank overfill East to swale Up to 500 gallons gallons /minute Up to 50 Pipe failure N/A N/A gallons /minute Leaking Pipe N/A N/A Gradual Gradual to Tank truck leak or failure East to swale Up to 2,000 gallons Instantaneous Up to 50 Hose leak during transfer East to swale Up to 500 gallons gallons /minute Up to 50 Pump rupture or failure East to swale Up to 500 gallons gallons /minute 10 Concrete Plant Area Potential Failure Spill Direction Volume Released Spill Rate Complete failure of a full tank North to swale Up to 5,000 gallons Instantaneous Gradual to Partial failure of a full tank North to swale Up to 5,000 gallons Instantaneous Up to 50 Tank overfill North to swale Up to 500 gallons gallons /minute Up to 50 Pipe failure N/A N/A gallons /minute Leaking Pipe N/A N/A Gradual Gradual to Tank truck leak or failure North to swale Up to 2,000 gallons Instantaneous Up to 50 Hose leak during transfer North to swale Up to 500 gallons gallons /minute Up to 50 Pump rupture or failure North to swale Up to 500 gallons gallons /minute Asphalt Plant Area Potential Failure Spill Direction Volume Released Spill Rate Complete failure of a full tank South to swale Up to 660,000 gallons Instantaneous Gradual to Partial failure of a full tank South to swale Up to 660,000 gallons Instantaneous Up to 50 Tank overfill South to swale Up to 10,000 gallons gallons /minute Up to 50 Pipe failure South to swale Up to 50,000 gallons gallons /minute Leaking Pipe South to swale Up to 10,000 gallons Gradual Gradual to Tank truck leak or failure South to swale Up to 10,000 gallons Instantaneous Up to 50 Hose leak during transfer South to swale Up to 2,000 gallons gallons /minute Up to 50 Pump rupture or failure South to swale Up to 1,000 gallons gallons /minute Maintenance Area Potential Failure Spill Direction Volume Released Spill Rate Complete failure of a full tank South to swale Up to 8,000 gallons Instantaneous Gradual to Partial failure of a full tank South to swale Up to 4,000 gallons Instantaneous Up to 50 Tank overfill South to swale Up to 1,000 gallons gallons /minute Up to 50 Pipe failure South to swale Up to 1,000 gallons gallons /minute Leaking Pipe South to swale Up to 500 gallons Gradual Gradual to Tank truck leak or failure South to swale Up to 2,000 gallons Instantaneous Up to 50 Hose leak during transfer South to swale Up to 500 gallons gallons /minute 11 Up to 50 Pump rupture or failure South to swale Up to 100 gallons gallons /minute 12 CONTAINMENT AND DIVERSIONARY STRUCTURES (40 CFR 112.7(c)(1)) Provide appropriate containment and/or diversionary structures or equipment to prevent a discharge as described in 112.1(b). The entire containment system, including walls and floor, must be capable of containing oil and must be constructed so that any discharge from a primary containment system, such as a tank or pipe, will not escape the containment system before cleanup occurs. At a minimum, you must use one of the following prevention systems or its equivalent: (1) For onshore facilities: (i) Dikes, berms, or retaining walls sufficiently impervious to contain oil; (ii) Curbing; (iii) Culverting, gutters, or other drainage systems; (iv) Weirs, booms, or other barriers; (v) Spill diversion ponds; (vi) Retention ponds; or (vii) Sorbent materials. (2) For offshore facilities: (i) Curbing or drip pans; or (ii) Sumps and collection systems. Mining Area Note: Motive power containers are located in or on a motor vehicle, such as on -board bulk oil storage containers used solely to power the movement of a motor vehicle, or ancillary on- board, oil filled operational equipment used solely to facilitate its operation. A motive power container can be considered non transportation- related and subject to the SPCC rule. However, EPA does not believe the intent of the SPCC rule was to regulate motive power containers, including oil filled tanks used to fuel the propulsion of vehicles, such as buses, sport utility vehicles, construction vehicles, and farm equipment. (from the US EPA "SPCC Guidance for Regional Inspectors" 2005) 1 -2 Wheel Loaders for example, a Caterpillar 988H contains 542.3 gallons maximum of petroleum related product onboard (188 gallons in the fuel tank) 1 Bulldozer for example, a Caterpillar D5K Track -Type Tractor contains 81.23 gallons maximum of petroleum- related product onboard (51.5 gallons in the fuel tank) 1 Grader for example, a Caterpillar 140M Motor Grader contains 179.83 gallons maximum of petroleum- related product onboard (110 gallons in the fuel tank) 1 -2 Scrapers for example, a Caterpillar 637G Wheel Tractor Scraper contains 931.4 gallons maximum of petroleum related product onboard (2 fuel tanks of 335 gallons each) 1 Service Truck The service truck will periodically enter the mining area to fuel the construction equipment. This truck will contain approximately 2,000 gallons of diesel fuel and will not be exclusive to this facility and therefore not subject to SPCC regulation. 13 There will need to be an interim fueling tank located here of approximately 4,000 gallons to fuel the construction vehicles until the maintenance area is permitted. This tank will have secondary containment of an interstitial shell or 110% capacity. Aggregate Processing Area 1 Excavator for example, a Caterpillar 345 D L Hydraulic Excavator contains 234.45 gallons maximum of petroleum related product onboard (137.37 gallons in the fuel tank) There will need to be an interim fueling tank located here of approximately 5,000 gallons to fuel the construction vehicles until the maintenance area is permitted. This tank will have secondary containment of an interstitial shell or 110% capacity. Concrete Plant Area There will need to be an interim fueling tank located here of approximately 5,000 gallons to fuel the ready -mix vehicles until the maintenance area is permitted. This tank will have secondary containment of an interstitial shell or 110% capacity. Asphalt Plant Area (3) 660,000 gallon asphalt tanks (to be regulated by MPCA) These tanks will be located within an earthen berm designed by a professional engineer that will be able to contain 110% of the largest tank or 726,000 gallons plus the displacement of the other two tanks. Any additional petroleum related products used at this facility will be located within secondary containment and will be reflected in this document upon permitting of this area. Because of the large quantities of oil located in this area, it is imperative that a robust inspection program and sorbent booms be considered and added to the SPCC during permitting. Maintenance Area The maintenance area will be equipped with spill kits. These kits will address any small petroleum spills that may occur during vehicle maintenance or material transfer. (3) 8,000 gallon diesel tanks (to be regulated by MPCA) These double walled tanks are surrounded by protective bollards. Any spilled material from the interstitial or second line -of- defense will be taken into consideration during the permitting of this area with this plan updated to reflect any new design. 14 (1) 560 gallon waste oil storage (to be registered with the MPCA) The waste oil tank is located in the maintenance garage. The catchment basins of the garage are designed to collect at minimum 110% of this volume for subsequent pump out. These drains will be connected to an oil -water separator or will not be allowed to daylight. If an oil -water separator is utilized, any oil or water will be disposed of in accordance with all applicable regulations. Oil will be added to the waste oil tank or hauled offsite by a licensed waste hauler. A licensed waste hauler will pick up, transport, and properly dispose of any industrial wastewater from the separator. (2) 275 gallon motor and hydraulic oils These tanks are located in the maintenance garage. The catchment basins of the garage are designed to collect at minimum 110% of this volume for subsequent pump -out. These drains will be connected to an oil -water separator or will not be allowed to daylight. (8) 55 gallon drums motor oil, hydraulic fluid etc... These drums are located in the maintenance garage. The catchment basins of the garage are designed to collect at minimum 110% of this volume for subsequent pump -out. These drains will be connected to an oil -water separator or will not be allowed to daylight. Casting Yard The casting yard may have a gantry crane onsite to haul precast products. This crane's fuel capacity will be noted in this plan during the permitting of this site and will be considered a motive power source. 15 DEMONSTRATION OF PRACTICABILITY (40 CFR 112.7(d)) (d) If you determine that the installation of any of the structures or pieces of equipment listed in paragraphs (c) and (h)(1) of this section, and 112.8(c)(2), 112.8(c)(11), 112.9(c)(2), 112.10(c), 112.12(c)(2), 112.12(c)(11), 112.13(c)(2), and 112.14(c) to prevent a discharge as described in 112.1(b) from any onshore or offshore facility is not practicable, you must clearly explain in your Plan why such measures are not practicable; for bulk storage containers, conduct both periodic integrity testing of the containers and periodic integrity and leak testing of the valves and piping; and, unless you have submitted a response plan under 112.20, provide in your Plan the following: (1) An oil spill contingency plan following the provisions of part 109 of this chapter. (2) A written commitment of man power, equipment, and materials required to expeditiously control and remove any quantity of oil discharged that may be harmful. Dakota Aggregate's management has determined that use of the containment and diversionary structures and the use of readily available spill equipment to prevent discharged oil from reaching navigable water, is practical and effective at this facility. 16 INSPECTIONS /RECORDS (40 CFR 112.7(e)) Conduct inspections and tests required by this part in accordance with written procedures that you or the certifying engineer develop for the facility. You must keep these written procedures and a record of the inspections and tests, signed by the appropriate supervisor or inspector, with the SPCC Plan for a period of three years. Records of inspections and tests kept under usual and customary business practices will suffice for purposes of the paragraph. Daily visual inspections are conducted to check for tank leakage or damage. The checklist provided in attachment D is used for monthly inspections. These inspections are performed in accordance with engineering specifications and are maintained for 5 years. 17 TRAINING (40 CFR 112.7(0) (1) At a minimum, train your oil handling personnel in the operation and maintenance of equipment to prevent discharges; discharge procedure protocols; applicable pollution control laws, rules, and regulations; general facility operations; and, the contents of the facility SPCC Plan. Oil handling personnel are trained in the operation and maintenance of equipment to prevent discharges in accordance with general facility operations and applicable pollution control laws. (2) Designate a person at each applicable facility who is accountable for discharge prevention and who reports to facility management. The facility manager is designated as accountable for discharge prevention. (3) Schedule and conduct discharge prevention briefings for your oil handling personnel at least once a year to assure adequate understanding of the SPCC Plan for that facility. Such briefings must highlight and describe known discharges as described in 112.1(b) or failures, malfunctioning components, and any recently developed precautionary measures. These briefings will be held once a year, likely before the construction season, and will highlight any new changes from the previous year. 18 SECURITY (40 CFR 112.7(g)) (1) Fully fence each facility handling, processing, or storing oil, and lock and/or guard entrance gates when the facility is not in production or is unattended. Facility entrance gates are locked when the facility is not in production or is unattended. (2) Ensure that the master flow and drain valves and any other valves permitting direct outward flow of the container's contents to the surface have adequate security measures so that they remain in the closed position when in non operating or non standby status. When the tanks are in non operating or standby status, any valves that allow outward flow will be securely closed in a non operating status. (3) Lock the starter control on each oil pump in the "off' position and locate it at a site accessible only to authorized personnel when the pump is in a non- operating or non- standby status. A key is required to operate the permanent diesel tanks. Starter controls will be locked in the off position when pumps are in non operating status. (4) Securely cap or blank flange the loading /unloading connections of oil pipelines or facility piping when not in service or when in standby service for an extended time. This security practice also applies to piping that is emptied of liquid content either by draining or by inert gas pressure. The connections for loading /unloading of oil pipelines will be capped when not in service for extended periods. (5) Provide facility lighting commensurate with the type and location of the facility that will assist in the: (i) Discovery of discharges occurring during hours of darkness, both by operating personnel, if present, and by non- operating personnel (the general public, local police, etc); and The fueling area is sufficiently lit so as to assist in the discovery of discharges occurring in darkness by operating and non operating personnel. (it) Prevention of discharges occurring through acts of vandalism. The fueling area is sufficiently lit so as to prevent discharged occurring through acts of vandalism. 19 TANK CAR LOADING /UNLOADING RACKS (40 CFR 112.7(h)) (1) Where loading /unloading area drainage does not flow into a catchment basin or treatment facility designed to handle discharges, use a quick drainage system for tank car or tank truck loading and unloading areas. You must design any containment system to hold at least the maximum capacity of any single compartment of a tank car or tank truck loaded or unloaded at the facility. There is no loading or unloading of any tank cars or tank trucks at this facility. (2) Provide an interlocked warning light or physical barrier system, warning signs, wheel chocks, or vehicle break interlock system in loading /unloading areas to prevent vehicles from departing before complete disconnection of flexible or fixed oil transfer lines. There is no loading or unloading of any tank cars or tank trucks at this facility. (3) Prior to filling and departure of any tank car or tank truck, closely inspect for discharges the lowermost drain and all outlets of such vehicles, and if necessary, ensure that they are tightened, adjusted, or replaced to prevent liquid discharge while in transit There is no loading or unloading of any tank cars or tank trucks at this facility. 20 FACILITY DRAINAGE (40 CFR 112.8(b) 112.12(b)) (1) Restrain drainage from diked storage areas by valves to prevent a discharge into the drainage system or facility effluent treatment system, except where facility systems are designed to control such discharge. You may empty diked areas by pumps or ejectors; however, you must manually activate these pumps or ejectors and must inspect the condition of the accumulation before starting, to ensure no oil will be discharged Diked drainage area around bulk storage tanks are designed to control such discharge. (2) Use valves of manual, open -and- closed design, for the drainage of diked areas. You may not use flapper -type drain valves to drain diked areas. If your facility drainage drains directly into a watercourse and not into an onsite wastewater treatment plant, you must inspect and may drain uncontaminated retained stormwater, as provided in paragraphs (c)(3)(ii), (iii), and (iv) of this section. Flapper -type drain valves are not utilized at this facility. (3) Design facility drainage systems from undiked areas with a potential for a discharge (such as where piping is located outside containment walls or where tank truck discharges may occur outside the loading area) to flow into ponds, lagoons, or catchment basins designed to retain oil or return it to the facility. You must not locate catchment basins in areas subject to periodic flooding. There will be no areas without secondary containment on any petroleum- related above ground storage tank of capacity 55 gallon or over. As an added 3 line of defense, any spilled material within the AUF would flow to the drainage swales leading to the internal stormwater pond. Countermeasures would then be deployed so that no product could leave the AUF. (4) If facility drainage is not engineered as in paragraph (b)(3) of this section, equip the final discharge of all ditches inside the facility with a diversion system that would, in the event of an uncontrolled discharge, retain oil in the facility. Facility drainage systems are adequately engineered to prevent any uncontrolled discharge from leaving the facility in the event of equipment or human error. (5) Where drainage waters are treated in more than one treatment unit and such treatment is continuous, and pump transfer is needed, provide two "lift" pumps and permanently install at least one of the pumps. Whatever techniques you use, you must engineer facility drainage systems to prevent a discharge as described in §J 12.1(b) in case there is an equipment failure or human error at the facility. Drainage waters are not treated in more than one treatment unit at this facility. 21 BULK STORAGE TANKS (40 CFR 112.8(c) 112.12(c)) (1) Not use a container for the storage of oil unless its material and construction are compatible with the material stored and conditions of storage such as pressure and temperature. All bulk storage containers are compatible with the materials stored and the conditions of storage. (2) Construct all bulk storage container installations so that you provide a secondary means of containment for the entire capacity of the largest single container and sufficient freeboard to contain precipitation. You must ensure that diked areas are sufficiently impervious to contain discharged oil. Dikes, containment curbs, and pits are commonly employed for this purpose. You may also use an alternative system consisting of a drainage trench enclosure that must be arranged so that any discharge will terminate and be safely confined in a facility catchment basin or holding pond. All bulk storage containers are located within containment sufficient to hold the capacity of the largest single container or are located in an area in which drainage leads to a holding tank designed for the discharge of oil. (3) Not allow drainage of uncontaminated rainwater from the diked area into a storm drain or discharge of an effluent into an open watercourse, lake, or pond, bypassing the facility treatment system unless you; (i) Normally keep the bypass valve sealed closed. Any bypass valves will be sealed unless uncontaminated rainwater needs to be released. (ii) Inspect the retained rainwater to ensure that its presence will not cause a discharge as described in §112.1(b). Retained water is inspected to insure that its presence will not cause a discharge into an open watercourse. (iii) Open the bypass valve and reseal it following drainage under responsible supervision; and Any bypass valve operators will be trained annually. (iv) Keep adequate records of such events, for example, any records required under permits issued in accordance with §§122.410)(2) and 122.41(m)(3) of this chapter. Drainage event records are shown in Attachment C. (4) Protect any completely buried metallic storage tank installed on or after January 10, 1974 from corrosion by coatings or cathodic protection compatible with local soil conditions. You must regularly leak test such completely buried metallic storage tanks. No underground storage tanks (USTs) are located at this facility. (5) Not use partially buried or bunkered metallic tanks for the storage of oil, unless you protect the buried section of the tank from corrosion. You must protect partially buried and bunkered tanks from corrosion by coatings or cathodic protection compatible with local soil conditions. 22 No partially buried or bunkered tanks are located at this facility. (6) Test each aboveground container for integrity on a regular schedule, and whenever you make material repairs. The frequency of and type of testing must take into account container size and design (such as floating roof skid mounted, elevated, or partially buried). You must combine visual inspection with another testing technique such as hydrostatic testing, radiographic testing, ultrasonic testing, acoustic emissions testing, or another system of non- destructive shell testing. You must keep comparison records and you must frequently inspect the outside of the container for signs of deterioration, discharges, or accumulation of oil inside diked areas. Records of inspections and tests kept under usual and customary business practices will suffice for purposes of this paragraph. Aboveground storage containers are periodically tested using a system of visual inspection of tank condition and integrity of supports and foundation. (7) Control leakage through defective internal heating coils by monitoring the steam return and exhaust lines for contamination from internal heating coils that discharge into an open watercourse, or pass the steam return or exhaust lines through a settling tank, skimmer, or other separation or retention system. There are no internal heating coils at this facility. (8) Engineer or update each container installation in accordance with good engineering practice to avoid discharges. You must provide at least one of the following devices: a. High liquid level alarms with an audible or visual signal at a constantly attended operation or surveillance station. In smaller facilities an audible air vent may suffice. High liquid level alarms are in place to avoid any discharges associated with overfilling of bulk storage containers and fuel tanks. b. High liquid level pump cutoff devices set to stop flow at a predetermined container content level. c. Direct audible or code signal communication between the container gauger and the pumping station. d. A fast response system for determining the liquid level of each bulk storage container such as digital computers, telepulse, or direct vision gauges. If you use this alternative, a person must be present to monitor gauges and the overall filling of bulk storage containers. (9) Observe effluent treatment facilities frequently enough to detect possible system upsets that could cause a discharge as described in §112.1(6). Plant effluent is observed to detect any discharges. (10) Promptly correct visible discharges which result in a loss of oil from the container, including but not limited to seams, gaskets, piping, pumps, valves, rivets, and bolts. You must promptly remove any accumulations of oil in diked areas. Accumulation of oil in any diked area is promptly removed. See page 6 for NRC number. (1 1) Position or locate mobile or portable oil storage containers to prevent a discharge as described in §112. I (b). You must furnish a secondary means of containment, such as a dike or catchment basin, sufficient to contain the capacity of the largest single compartment or container with sufficient freeboard to contain precipitation. 23 Any mobile or portable containers will be located within secondary containment. Any discharges occurring within the maintenance garage are promptly removed using sorbent materials. In the event of an uncontrolled spill, any discharge will flow to a floor drain oil -water separator sufficient to contain the capacity of the largest single tank with sufficient freeboard to contain any other discharge. 24 TRANSFER OPERATIONS (40 CFR 112.8(d) 112.12(d)) (1) Provide buried piping that is installed or replaced on or after August 16, 2002, with a protective wrapping and coating. You must also cathodically protect such buried piping installations or otherwise satisfy the corrosion protection standards for piping in part 280 of this chapter or a State program approved under part 281 of this chapter. If a section of buried line is exposed for any reason, you must carefully inspect it for deterioration. If you find corrosion damage, you must undertake additional examination and corrective action as indicated by the magnitude of the damage. No buried piping is located at this facility. (2) Cap or blank flange the terminal connection at the transfer point and mark it as to origin when piping is not in service or is in standby service for an extended time. No buried piping is located at this facility. (3) Properly design pipe supports to minimize abrasion and corrosion and allow for expansion and contraction. Aboveground pipe supports are designed to minimize abrasion and corrosion and allow for expansion and contraction. (4) Regularly inspect all aboveground valves, piping, and appurtenances. During the inspection you must assess the general condition of items, such as flange joints, expansion joints, valve glands and bodies, catch pans, pipeline supports, locking of valves, and metal surfaces. You must also conduct integrity and leak testing of buried piping at the time of installation, modification, construction, relocation, or replacement. All above ground piping supports and valves are periodically inspected. (5) Warn all vehicles entering the facility to be sure that no vehicle will endanger aboveground piping or other oil transfer operations. All aboveground piping is located where no vehicle will endanger their integrity. 25 ATTACHMENT A Certification of the Applicability of the Substantial Harm Criteria Checklist Facility Name: Facility Address: 1. Does the facility transfer oil over water to or from vessels and does the facility have a total oil storage capacity greater than or equal to 42,000 gallons? Yes No 2. Does the facility have a total oil storage capacity greater than or equal to 1 million gallons and does the facility lack secondary containment that is sufficiently large to contain the capacity of the largest aboveground oil storage tank plus sufficient freeboard to allow for precipitation within any aboveground oil storage tank area? Yes No 3. Does the facility have a total oil storage capacity greater than or equal to 1 million gallons and is the facility located at a distance (as calculated using the appropriate formula in Attachment C -III, Appendix C, 40 CFR 112 or a comparable formula') such that a discharge from the facility could cause injury to fish and wildlife and sensitive environments? For further description of fish and wildlife and sensitive environments, see Appendices I, II, and III to DOC/NOAA's "Guidance for Facility and Vessel Response Plans: Fish and Wildlife and Sensitive Environments" (Section 13, Appendix E, 40 CFR 112 for availability) and the applicable Area Contingency Plan. Yes No 4. Does the facility have a total oil storage capacity greater than or equal to 1 million gallons and is the facility located at a distance (as calculated using the appropriate formula in Attachment C -III, Appendix C, 40 CFR 112 or a comparable formula') such that a discharge from the facility would shut down a public drinking water intake'? Yes No 5. Does the facility have a total oil storage capacity greater than or equal to 1 million gallons and has the facility experienced a reportable oil spill in an amount greater than or equal to 10,000 gallons within the last 5 years? Yes No CERTIFICATION I certify under penalty of law that I have personally examined and am familiar with the information submitted in this document, and that based on my inquiry of those individuals responsible for obtaining this information, I believe that the submitted information is true, accurate, and complete. Name (please type or print) Signature Title Date l If a comparable formula is used, documentation of the reliability and analytical soundness of the comparable formula must be attached to this form. 2 For the purposes of 40 CFR part 112, public drinking water intakes are analogous to public water systems as described at 40 CFR 143.2(c). (from 40 CFR 112 Appendix C, Attachment C -II) 26 ATTACHMENT B Site Plans (Figures 1— 6) 27 ATTACHMENT C Drainage Event Records Date Operator Condition of Water Volume Drained 28 ATTACHMENT D Facility Inspection Checklist Instructions: This inspection record will be completed every month. Place an X in the appropriate box for each item. If any response requires elaboration, do so in the Descriptions and Comments space provided. Further descriptions or comments should be attached on a separate sheet of paper if necessary. Yes No Description and Comments Tank shows signs of leakage Tanks are damaged Tank supports are deteriorated Tank foundations have eroded Level gauges or alarms are inoperative Valve seals or gaskets are leaking Pipelines or supports are damaged or deteriorated Buried pipelines are exposed Loading/Unloading area is damaged or deteriorated Connections are not capped or blank flanged Secondary Containment is damaged or stained Fencing, gates or lighting is non- functional Remarks: Signature: Date: 29 ATTACHMENT E Training Records 30 ATTACHMENT F Discharge Notification Form Discharge /Discovery Date Time Facility Name Facility Location (Address /Lat- Long /Section Township Range) Name of Reporting Individual Telephone Type of Material Discharged Estimated total Gallons /Barrels quantity discharged Source of the Discharge Media Affected 8 Soil 8 Water (specify) 8 Other (specify) Actions Taken Damage or Injuries B Yes 8 N (specify) Evacuation Needed 9 Yes 8 N (specify) Organizations and individuals B National Response Center Time: contacted 8 Cleanup Contractor (specify) Time: 8 Facility Personnel (specify) Time: 8 State Agency (specify) Time: E Other (specify) Time: 31 ATTACHMENT G Emergency Response Plan and Notifications The release or spill of a hazardous substance is a public and employee health concern that must be reported to the proper State authorities. States require the notification be made to them if a spill of petroleum products is 5 gallons or more. The spills can include but are not limited to hydraulic fluids, oils and diesel fuel. It is our responsibility and commitment to ensure such spills are immediately reported and cleaned up. The procedure for reporting spills or releases from equipment off Company property will be: 1.) Contain the spill. Dike or put sand on the spill to prevent it from moving into sewers or wet land (Only if it is safe to do so). 2.) Secure the scene, keep people away. 3.) Notify your dispatcher with the location of the spill and the amount spilled, who in turn notifies: Local emergency 911 only if immediate danger of life or property exists PRIMARY CONTACT: Pat Bergin: Environmental Manager Office (651) 686 -4221 Mobile (651) 238 -5333 SECONDARY CONTACT: Mike Brekken: Safety Director Office (651) 686 -4272 Mobile (612) 309 -1765 If Pat Bergin or Mike Brekken cannot be reached, the area manager will be responsible for reaching the proper State officials, and ensuring proper cleanup. The Following numbers are State officials who will be notified after a spill of 5 gallons or more of petroleum products. Minnesota Iowa 1- 800 422 -0798 Greater Minnesota (515) 281 -8694 (612) 649 -5451 Metro Area Wisconsin South Dakota 1- 800 943 -0003 (605)773 -3231 (608)242 -3232 non emergency Nebraska (402) 471 -4230 (402) 471 -4545 after hours *If the spill impacts a navigable waterway the National Response Center must be notified at 1- 800- 424 -8802 Be prepared to give the following information to State officials: 1. Your name and job title 2. Company name and address 3. The chemical name or identity of the substance involved in the release 4. An estimate of the quantity of the substance released 5. The time, location and duration of the release 6. The medium or media into which the release occurred (pavement, sewer etc...) 7. Location of spill 8. Weather condition 32 The procedure for reporting spills or releases from the equipment or tanks on company property will be: 1.) Secure the scene and keep people away 2.) Contain the spill, Dike or put dirt on spill to prevent it from moving into sewers or wetlands, only if it is safe, if not 911 should be called 3.) Notify your dispatcher or plant manager (Batchman), who in turn notifies Local emergency 911 only if immediate danger of life or property exists PRIMARY CONTACT: Pat Bergin: Environmental Manager Office (651) 686 -4221 Mobile (651) 238 -5333 SECONDARY CONTACT: Mike Brekken: Safety Director Office (651) 686 -4272 Mobile (612) 309 -1765 If Pat Bergin or Mike Brekken cannot be reached, the area manager will be responsible for reaching the proper State officials, and ensuring proper cleanup. The Following numbers are State officials who will be notified after a spill of 5 gallons or more of petroleum products. Minnesota 1- 800 422 -0798 Greater Minnesota (612) 649 -5451 Metro Area *If the spill impacts a navigable waterway the National Response Center must be notified at 1- 800- 424 -8802 Be prepared to give the following information to State officials: 1. Your name and job title 2. Company name and address 3. The chemical name or identity of the substance involved in the release 4. An estimate of the quantity of the substance released 5. The time, location and duration of the release 6. The medium or media into which the release occurred (pavement, sewer etc...) 7. Location of spill 8. Weather condition The below Emergency Responders can be contacted if we need special assistance. The decision to call the Emergency Responders will be based on employee and public safety, our ability to clean up the spill, impact or potential impact on the environment, release into waterways. The decision to make the call will be made by Pat Bergin or Mike Brekken. 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Environmental Contingency Plan UMore Mining Area Dakota County, Minnesota Prepared for Dakota Aggregates July 2012 BARR Environmental Contingency Plan UMore Mining Area Dakota County, Minnesota Prepared for Dakota Aggregates July 2012 4700 West 77 Street Minneapolis, MN 55435 -4803 Phone: (952) 832 -2600 BARR Fax: (952) 832 -2601 Date: July 2012 Emergency Contacts Fire 911 (emergency), 651- 423 -3444 (non- emergency) Rosemount Police Department 651- 423 -4491 Dakota County Sheriff's Department 651- 438 -4700 MPCA Metro Duty Officer (for spills greater than 5- gallons) 651- 649 -5451 University Contacts Janet Dalgleish, Environmental Health and Safety Project Manager o Contact if contingency item is encountered o datg1006@umn.edu o 612- 626 -7095 (office) o 612 205 -3339 (cell) Steven Lott, UMore Park Project Manager o Contact if contingency item is encountered o lottx020 cr,umn.edu o 651- 423 -2562 (office) o 952- 239 -1767 (cell) Sean Gabor, FM -HMP Supervisor o Contact to coordinate pre development asbestos inspection or if ACM is encountered o gabor002 a,umn.edu o 612- 625 -7547 (office) o 612- 875 -8857 (cell) Barr Contacts Kristen Schimpke, Project Manager o Contact to coordinate training or pre- development inspection and if contingency item is encountered o kschimpke@barr.com o 952- 832 -2788 (office) o 612 -396 -7610 (cell) Jim Aiken, Principal -in- Charge o Alternate contact if Kristen Schimpke cannot be reached o jaiken o 952- 832 -2725 (office) \barr.com\ projects \Mpls \23 MN A9,23191101 Dakota Aggregates UMA Pennitti \WorkFiles \ECP \Environmental Contingency Plan v2.0.doc o 612 723 -7373 (cell) Jim Eidem, Senior Hydrogeologist o Alternate contact if Kristen Schimpke cannot be reached o jeidem @barr.com o 952- 832 -2763 (office) o 612- 803 -5156 (cell) \barr.com \projects \Mpls \23 MN\19'23191101 Dakota Aggregates UMA Pennitti \WorkFiles \ECP \Environmental Contingency Plan v2.0.doc 11 Environmental Contingency Plan UMore Mining Area Dakota County, Minnesota July 2012 Table of Contents 1.0 Introduction 1 2.0 Contingency Plan 3 2.1 Mining Overview 3 2.2 Training Requirements 3 2.3 Pre- Development Inspection 4 2.4 Identification of Contingency Items 4 2.5 Contingency Process 5 2.6 Interim Actions 6 2.6.1 Hazardous Materials 6 2.6.2 Non Hazardous Materials 7 2.6.3 Unsealed Wells 7 2.6.4 Buried Debris and Asbestos Containing Materials 7 2.6.5 Buried Drums, Tanks or Containers 8 2.6.5 Historic Utility Lines 8 3.0 References 9 List of Figures Figure 1 Site Location Figure 2 Site Features Figure 3 Contingency Plan Overview List of Appendices Appendix A Roles and Contact Information Appendix B Procedures for Tree Removal Appendix C Well Inventory Results \barr.comAprojects \Mpls \23 MN \19x23191101 Dakota Aggregates UMA PermittiAWorkFiles \ECP \Environmental Contingency Plan v2.0.doc 111 1.0 Introduction This Environmental Contingency Plan (ECP) was prepared for the northern portion of the University of Minnesota Outreach, Research, and Education (UMore) Mining Area (UMA) in Rosemount, Minnesota (Site). The University of Minnesota (University) is leasing the UMA to Dakota Aggregates LLC (Dakota Aggregates) to conduct phased sand and gravel mining and related processing activities. The portion of the UMA that is addressed by this ECP (Site) is shown on Figure 1. The purpose of this ECP is to describe the steps that will be taken when an unexpected, potential release condition is exposed during mining excavation activities. The conditions addressed are specifically related to past land use. Spills or releases of petroleum products or hazardous materials related to mining operations are addressed in the Spill Prevention Control and Countermeasures (SPCC) Plan and are not within the scope of this document. This ECP was prepared by Barr Engineering Co. (Barr) on behalf of Dakota Aggregates and in accordance with Minnesota Pollution Control Agency (MPCA) guidance (MPCA, 2001). This ECP will be amended as needed to address mining activities in the southern portion of the UMA. The UMA consists of the approximate western third of the UMore Park property owned by the University and was once owned by the U.S. Government. UMore Park includes portions of the former Gopher Ordnance Works (GOW), which was constructed and operated from 1942 to 1945 by E.I DuPont de Nemours for the U.S. Government. The plant was established to manufacture smokeless gunpowder, oleum (an intermediate used in the manufacture of sulfuric acid), and nitric acid. Dinitrotoluene (DNT), aniline, dibutyl phthalate (DBP), and diphenylamine (DPA) were imported for use in the smokeless gunpowder manufacturing process. Other potential constituents related to the former GOW that were potentially released to the environment include metals, herbicides, asbestos, and volatile and semivolatile organic compounds. By 1946, the GOW had been decommissioned and most of the buildings had been decontaminated and demolished by the federal government. Portions of the former GOW, including the UMA, were conveyed by the federal government to the University in 1947 and 1948. Previous environmental investigations (Barr, 2009; Barr, 2009a; Barr, 2009b; Barr, 2010) have been conducted at the UMA to identify potential releases of hazardous substances or petroleum products. The investigation revealed no significant releases of hazardous substances or petroleum products on the Site. However, it is recognized that the stripping of soil prior to mining as well as mine \Vbarr.com \projects \Mpls \23 MN \19'23191101 Dakota Aggregates UMA PermittiAWorkFiles \ECP \Environmental Contingency Plan v2.0.doc 1 excavation presents the possibility that environmental issues may be unexpectedly encountered as part of the mining activities. The majority of GOW operations were located east of the UMA. However, a railroad corridor (known as Site of Concern or SOC 1) and an excess supply yard (SOC 2) were located in the northern and eastern portions of the UMA, within the Site. Some of the materials used for construction and operation of the GOW likely arrived via the railroad system. No known releases are associated with the railroad and excess material storage areas within the Site. Each of these areas was investigated and the results reviewed by the MPCA (Barr, 2009). No evidence of a release was as detected within the Site. A single detection of benzo(a)pyrene was detected slightly above the MPCA Tier 1 Residential Soil Reference Values (SRVs) along the railroad corridor just east of the UMA. Additional detailed descriptions of land use history, previous investigations, geology, and hydrogeology for the Site is provided in the following reports: Barr Engineering, 2008. Phase II Investigation Work Plan for UMore Mining Area (UMA), Rosemount and Empire Township, Dakota County, Minnesota. Barr Engineering, 2009. Groundwater Assessment Report, Resource Document for Environmental Impact Statement, UMore Mining Area, Dakota County, Minnesota. Barr Engineering, 2009. Phase II Investigation Report, Sites of Concern 1 -3 and 6 -8, UMore Mining Area, Dakota County, Minnesota. Barr Engineering, 2010. Technical memorandum from Jim Aiken of Barr to Steven Lott and Janet Dalgleish of the University of Minnesota regarding the Preliminary Subsurface Investigation Results, Ancillary Use Facility (AUF), UMore Mining Area, Dakota County, Minnesota. Peer, 2006. Phase I Environmental Site Assessment, UMore Park, Rosemount, Minnesota, Prepared for the University of Minnesota by Peer Environmental and Engineering Resources, Inc. University of Minnesota, 2010. UMore Park Sand and Gravel Resources, Final Environmental Impact Statement, Dakota County, Minnesota. \barr.com \projects \Mpls \23 MN \19 \23191101 Dakota Aggregates UMA Permitti \WorkFiles \ECP \Environmental Contingency Plan v2.0.doc 2 2.0 Contingency Plan This section describes the training requirements to identify contingency items, the pre development inspection requirements, the process that will be followed to identify contingency items and the actions that will be taken when contingency items are encountered during mining activities at the Site. All activities will be conducted in accordance with the MPCA requirements. A detailed description of the roles for the University, Dakota Aggregates and the environmental consultant, along with contact information, is provided in Appendix A. 2.1 Mining Overview It is estimated that 35 -40 million tons of sand and gravel will be mined at the Site within the next 25 years. Mining operations within each phase will include clearing and grubbing of vegetation, stripping topsoil and other non -sand or gravel overburden within the mining area, and the extraction of the sand and gravel with earth moving equipment. A soil berm will be constructed in the mining buffer area along the northern portion of the Site. An ancillary use facility (AUF) will be constructed on the eastern portion of the site along County Road 46 to support the mining operations and related activities (Figure 2). Activities at the AUF include sand and gravel processing (crushing, screening, washing, etc.), asphalt, concrete and recycled aggregate product production, and the production of cast concrete products. At the completion of mining activities, the area will be reclaimed for future development. 2.2 Training Requirements Training will be required for all onsite staff to facilitate an immediate response should an accident, release of a hazardous substance or petroleum or other spill occur in accordance with the SPCC Plan Additional site specific training will be conducted for new Site employees by the environmental consultant or the University and will include an overview of the Site history, a description of the pre development inspection process and contingency identification process. The training will also include a detailed description of the protocol that will be used if a contingency item is encountered. The training will be refreshed every five years. Contact information to schedule this training is provided in Appendix A. The University will also require all onsite staff to attend annual asbestos awareness training. This training will be conducted by the University and will include an overview of the site history and use of asbestos at the GOW, health effects from the exposure to asbestos and the procedures for \barr.com \projects \Mpls \23 MN \19 \23191101 Dakota Aggregates UMA Permitti \WorkFiles \ECP \Environmental Contingency Plan v2.0.doc 3 responding to any asbestos encountered at the Site. Contact information to schedule this training is provided in Appendix A. 2.3 Pre Development Inspection While the UMA has been previously investigated, pre- development inspection will be conducted at sites that are currently developed (i.e., the University's Western Complex) prior to Site preparation and tree clearing activities. This inspection will include a review of available information including historical aerial photographs and reports to identify potential sites where contingency items may be encountered including: Potential /Anticipated Sites Potential Contingency Items Former Farmsteads (shown Asbestos containing materials (ACM), drums, tanks, containers, on Figure 2) unsealed wells Dump Sites Pre -GOW farm dumps, GOW -era dumps with ACM, demolition debris, post -GOW dumps (pesticides, farm dumps, animal carcasses), drums, tanks, containers, hazardous substances In addition, the Site will be inspected by the environmental consultant for potential dumping /debris, unsealed wells, and other evidence of a release. During the pre development inspection, the Site will also be inspected for ACM by a licensed asbestos inspector, who is employed by the University's Facilities Management Hazardous Materials Program (FM -HMP). All tree clearing activities will be completed in compliance with the University's tree removal procedures in Appendix B. Suspect ACM will be sampled in accordance with the Minnesota Department of Health (MDH) and MPCA requirements. Contact information to schedule these inspections are provided in Appendix A. 2.4 Identification of Contingency Items Unexpected and potentially hazardous /unsafe conditions may be encountered during mining activities. Although a wide range of situations are possible, previous investigations and historical information suggest that the following conditions and /or observations should trigger a contingency response: The discovery of below -grade building foundations, unsealed wells, buried drums, pipes, tanks, and /or containers; Strong or unusual chemical odors during excavation (e.g., solvent, petroleum, etc.); Encountering unexpected industrial wastes such as tar, sludge, semisolids, powders, resins, or ash; \barr.com \projects \Mpls \23 MN \I9 \23191101 Dakota Aggregates UMA Penman AWorkFiles \ECP \Environmental Contingency Plan v2.0. 4 Discolored soil that is different than what is expected to be encountered during mining activities; Large quantities of unexpected buried debris such as metal scrap, cans, jars, brick, concrete, asphalt, or trash; Objects such as vent pipes or wells; or Potential ACM. Even if no condition is overtly discerned, every person onsite should be alert for conditions that require immediate attention. Persons who suddenly become ill at the site should be evaluated to address the potential for the illnesses related to potential exposure (i.e., certain hazardous substances such as methane gas which is odorless and colorless cannot be detected visually or by smell). 2.5 Contingency Process Upon identifying an unexpected and potentially hazardous /unsafe condition, the following protocol will be followed (see Figure 3): 1. Immediate Shut down Mining activities in the immediate operational area will cease immediately. Operating equipment will be turned off, and staff will move to a safe location (upwind, appropriate distance) to observe the conditions. Hazardous substances or petroleum products will not be re- buried. 2. In case of Emergency (such as fire, serious injury, etc.) call 911 If an emergency situation arises, or the immediate health and safety of staff and /or the public is at risk, staff will call 911 to report the situation and request appropriate assistance. 3. Initial Notification Dakota Aggregates will contact the University and the environmental consultant with a description of the current conditions and site observations. Contact information is provided in Appendix A. An appropriate immediate course of action (including site control, notifications, investigation, immediate actions, etc.) will be developed and implemented. 4. Assessing the Area The environmental consultant will characterize the potentially hazardous /unsafe condition to determine a proper course of action with regard to any potential release encountered. This may involve implementing measures to further secure the area (e.g., installing fencing or posting warning signs), collecting samples to identify the type and magnitude of the release, and placing test pits to help define the extent of the release. \ban. coin \projects \Mpls \23 MNV19 \23191101 Dakota Aggregates UMA PermittiAWorkFiles \ECP \Environmental Contingency Plan v2.0.doc 5 If the mining activities have caused a release of hazardous substances or petroleum products, the release must be reported within 24 hours to the MPCA through the Minnesota Duty Officer, Division of Emergency Management (see Appendix A for contact information). 5. Implementation (if necessary) In some cases, an interim action may be required to allow operations to proceed safely. Detailed actions for selected contingency items are provided in Section 2.5. An MPCA- approved investigation work plan (including a summary of interim actions) will be implemented to further define the magnitude and extent of the identified release. If response actions are required to address the release, an MPCA- approved response action plan will be implemented. All work done under the ECP will be performed by OSHA HAZWOPER trained personnel. 6. Resume Work Once the notification process has been initiated, the situation has been adequately assessed and addressed, work in the area may resume consistent with any conditions proscribed by the environmental consultant to ensure worker safety and protection of the environment. 7. Communication of Findings The MPCA, City of Rosemount and Dakota County will be notified of the conditions after the area has been fully assessed. 2.6 Interim Actions The following sections describe the general interim actions that will be taken in the event that unanticipated potentially hazardous /unsafe contingency conditions are encountered during mining activities. 2.6.1 Hazardous Materials Materials that are characterized as hazardous wastes will be containerized and temporarily stored on the Site on an impervious surface in a secured area until disposal arrangements are determined. If possible, hazardous materials will be stored within the area from which they originate. Containers will meet the appropriate requirements of the United States Department of Transportation (DOT), OSHA, and U.S. Environmental Protection Agency (EPA) regulations for the associated wastes. If appropriate, liquid wastes may be bulk- stored in tanks. Storage of hazardous materials at the Site will not exceed a duration of 120 days from the date that the material has been determined by chemical analysis or waste classification to be a hazardous waste. \barr.com \projects \Mpls \23 MN \1'9 \23191101 Dakota Aggregates UMA Permitti \WorkFiles \ECP \Environmental Contingency Plan v2.0.doc 6 2.6.2 Non Hazardous Materials If a non hazardous, potentially impacted material is encountered during mining activities, a materials staging area will be constructed at the Site by placing a minimum 15 to 20- mil -thick plastic sheet on the ground and a minimum 10- mil -thick plastic cover placed over stockpiles. The environmental consultant will be present during earthwork activities involving potentially impacted materials to observe the excavation, screen soils, classify materials, and collect analytical samples of the media, as warranted. Potentially impacted soils will be segregated based on appearance, odor, soil vapor headspace screening, XRF and /or similar field screening results. Soils determined to be impacted based on chemical analysis will be managed in accordance with MPCA guidance. 2.6.3 Unsealed Wells A well inventory survey was conducted in 2009 to locate existing and historical wells at the Site. Wells identified through this survey, including global positioning system (GPS) coordinates, are provided in Appendix C. Ten wells (eight existing (active) wells and two wells that are presumed to have been sealed) are located within the Site boundary (see Figure 2). All unsealed wells will be sealed prior to or during mining activities. If any additional unsealed wells are encountered during mining activities, the location will be marked by mining workers and the well will be permanently sealed by a licensed well contractor in accordance with State of Minnesota and Dakota County requirements. 2.6.4 Buried Debris and Asbestos Containing Materials Large quantities of unexpected buried debris or building foundations encountered during an excavation that do not contain ACM will be excavated, temporarily stockpiled onsite, and disposed of in the same way that non hazardous impacted soils are managed as described in 2.5.2 of this section. If suspected ACM is identified, samples of the material will be collected by a University FM -HMP employee. If excavation of ACM is required, the University will contract with a licensed asbestos abatement to provide the proper handling and disposal of the ACM. All asbestos related work will be conducted in accordance with Minnesota and federal National Emission Standards for Hazardous Air Pollutants (NESHAP) requirements, and if applicable, the University's tree removal procedures (Appendix B). An emission control plan will be prepared and implemented for the work to ensure maximum protection and to safeguard workers, visitors, tenants, site employees, and the environment. V \barr.com \projects \Mpls \23 MN \l9A23191101 Dakota Aggregates UMA PermittiAWorkFiles \ECP \Environmental Contingency Plan v2.0.doc 7 2.6.5 Buried Drums, Tanks or Containers If drums, tanks or other unidentified containers are encountered, they will be individually removed and their condition will be assessed. If an excavated drum, tank or container are not in good condition (e.g., severe rusting, structural defects, leaking, etc.), the materials will be transferred to a new drum, overpack, or DOT rated container. The containerized materials will be sampled and managed according to procedures described above. If an underground storage tank is discovered, the tank removal will be managed in accordance with MPCA guidelines and will be removed by an MPCA Certified Underground Storage Tank Contractor. 2.6.5 Historic Utility Lines Based on historic data provided by the Metropolitan Council, a former Metropolitan Council Environmental Services (MCES) interceptor sanitary sewer was abandoned in -place in the northern portion of the Site. The location of the sewer provided by the Met Council is shown on Figure 2. If the MCES interceptor sanitary sewer or other historic utility lines are encountered during mining activities, the utility will be inspected to determine if petroleum products or hazardous substances are present. Petroleum products and hazardous substances will be removed and containerized, when possible, before the utility is excavated. In situations where it is not possible to remove petroleum products or hazardous substances before the utility is removed, care will be taken to minimize releases to the environment and any releases will be managed as described in 2.5.2 of this section. \barr.com \projects \Mpls \23 MN \19`,23191101 Dakota Aggregates UMA PermittiAWorkFiles \ECP \Environmental Contingency Plan v2.0.doc 8 3.0 References Barr Engineering, 2008. Phase II Investigation Work Plan for UMore Mining Area (UMA), Rosemount and Empire Township, Dakota County, Minnesota. Barr Engineering, 2009a. Groundwater Assessment Report, Resource Document for Environmental Impact Statement, UMore Mining Area, Dakota County, Minnesota. Barr Engineering, 2009b. Phase II Investigation Report, Sites of Concern 1 -3 and 6 -8, UMore Mining Area, Dakota County, Minnesota. Barr Engineering, 2010a. Technical memorandum from Jim Aiken of Barr to Steven Lott and Janet Dalgleish of the University of Minnesota regarding the Preliminary Subsurface Investigation Results, Ancillary Use Facility (AUF), UMore Mining Area, Dakota County, Minnesota. Minnesota Pollution Control Agency, 2001. Guidance Document #10: Site Safety and Site Contingency Plans. Peer, 2006. Phase I Environmental Site Assessment, UMore Park, Rosemount, Minnesota, Prepared for the University of Minnesota by Peer Environmental and Engineering Resources, Inc. University of Minnesota, 2010. UMore Park Sand and Gravel Resources, Final Environmental Impact Statement, Dakota County, Minnesota \barr.corn \projects \Mpls \23 MN \19 \23191101 Dakota Aggregates UMA Permitti \WorkFiles \ECP \Environmental Contingency Plan v2.0 doc 9 4 4 E I 2 1 C-7- T V �-rb r -ir o m 0 a 0 I 2 E 2 I ,n l 0 ry F F m UMore Mining Area (UMA) Figure 1 Q UMore Park Boundary PROPERTY LOCATION Environmental Contingency Plan UMore Mining Area 0 3,000 6,000 12,000 Dakota County, MN Feet BARR 'Sk s r r y 'Ii M .ro T7 7--- y t r t.'" ,r fi Iry I 1 i [7.7. r v f l l a a{ e i. 11 yy�wt q t'( I f i, r r r. C a S' r �1 jr r 1 z t 1 of r- r r, r °r I ye, :t r .r "T. f v f f Ir1 y�� V: YNE WAV i: M f d -040.1.c../..‘.,;, A MINING BUFFER 's Tay' 1 r y.{ ELK. 1. L 4.- f T ria T +'7`3 "f (',1 Iii i I '1 el ROSEMOUNT DRY MINING A SE1 y" VI t o 4A::::". a 4y. ROSEMOUNT DRY ��a_:_. s. :a a'r .a a a w:.:- rx .rcr: MINING PHA:r: 8 0 208400 a... f/ f 4 MW Bt OO1\ ROSEMOUNT DRY MINING I t C DRY I NGT PHASE a ROS EM OPHASC MINING t t ROSEMOUNT PHASE 5 Y7 ,(.D RYMINING 1 PHASE] ROSEMOUNT S'1J.T DRY `DINING j :.iE5 ROSEMOUNT DRY MINING ROSEMOUNT DRY MIS 5G i r+', <1. PHASE B 1 y HA SEi1 ry�. 4,',•' 1 207616 -.,!E 1 vS'SS! Poultry Researt a ROSEMOUNT DRY MINING 41-t PHASE 9 PHAS N ,1 1 1 DRY V I T',I S L...._.i i f DRY WET I',IU; PHASLa G a CgMlaiKg r te 0 IT, -4. P. 1 I UMore Mining Area (UMA) Wells O UMore Park Boundary e Existing well (active) Figure 2 `�j Site of Concern (SOC) Boundary Not found, presumed active Pre -GOW Farmstead (Dakota County) 1, Not found, presumed sealed O SITE FEATURES EL Ancillary Use Facility Boundary Environmental Contingency Plan sewer Interceptor System Feet UMore Mining Area 900 0 900 Rosemount, MN Abandoned Sewer Interceptors IMSiial SOC1 Former Railroad "Y" SOC2 Forestry Research /Former GOW Storage BARR Source: Dakota County. Barr. James R. Hal. HKGi, MetCouncil Well data Ie from the Dakota County YVell and Water Management System (WELLMAN) and from Barr. c z f r e 2 k o c o a ea zc8o z Ow {E ft1 12 B •Q— \i ce g- e j g Sj, 2 e c f a a 84. 1. o o —6" E R i 2 o E 2 2 g C |`E t! i 0 f 2 2 l f k) �f u S.\ f f tit g' 0 I k e i o. 0 .2 0 S k 3 S e E 9 ij :i R }k 9 9 ƒ I A j o °!f &A 2 AR) z,61. ma 600 wo..o Act A...f...M0,0‘.0-0.nelA07.10MILOLL8t€218,INVIEMIdiT.1 Appendices Appendix A Roles and Contact Information Appendix A Roles and Contact Information 1.1 Roles University of Minnesota owner of the UMA o Pre Development Inspection: Conduct an inspection of each mining area before site preparation or tree clearing activities begin to identify and sample possible asbestos containing materials (ACM) o Contingency Process: Dakota Aggregates will contact the University if a contingency item is encountered during mining o Contingent Actions: The University will complete asbestos investigations and abatement if asbestos is encountered during mining activities. The University will also communicate any findings to the regulatory agencies with the assistance of Barr. Dakota Aggregates lessee of the UMA and gravel mining contractor o Training: All onsite workers will attend training to identify contingency items o Pre Development Inspection: Ensure that the inspections have been completed and the area has been cleared before site preparations or tree clearing begins o Contingency Process: Identify contingency items, and stop work, secure the area and notify Barr and the University when they are encountered o Contingent Actions: Ensure that the area remains secured during contingent actions, only OSHA HAZWOPER certified workers can perform work under the contingency plan Environmental Consultant (Barr Engineering) Environmental professional for Dakota Aggregates o Training: Barr will conduct training for Dakota Aggregate onsite workers for identifying contingency items o Pre Development Inspection: Conduct a historic review of the area (aerial photos, historic reports, etc.) and onsite inspection of each mining area before site preparation or tree clearing activities begin to identify potential dumping /debris piles, unsealed wells, and other evidence of a release o Contingency Process: Dakota Aggregates will contact Barr if a contingency item is encountered during mining, Barr will assist with assessing the area, oversee the implementation of contingent actions, if required, and assist in determining when work in the area can resume. o Contingent Actions: Barr will oversee all contingent actions and will assist the University with regulatory agency communications 1.2 2012 Contacts Emergency Contacts Fire 911 (emergency), 651- 423 -3444 (non- emergency) Rosemount Police Department 651- 423 -4491 Dakota County Sheriff's Department 651- 438 -4700 MPCA Metro Duty Officer (for spills greater than 5- gallons) 651- 649 -5451 University Contacts Janet Dalgleish, Environmental Health and Safety Project Manager o Contact if contingency item is encountered o da1a10064i)umn.edu o 612- 626 -7095 (office) o 612 205 -3339 (cell) Steven Lott, UMore Park Project Manager o Contact if contingency item is encountered o lottx020 aumn.edu o 651 -423 -2562 (office) o 952- 239 -1767 (cell) Sean Gabor, FM -HMP Supervisor o Contact to coordinate pre development asbestos inspection or if ACM is encountered o gabor002 &umn.edu o 612 625 -7547 (office) o 612 875 -8857 (cell) Barr Contacts Kristen Schimpke, Project Manager o Contact to coordinate training or pre development inspection and if contingency item is encountered o kschimpke @barr.com o 952- 832 -2788 (office) o 612- 396 -7610 (cell) Jim Aiken, Principal -in- Charge o Alternate contact if Kristen Schimpke cannot be reached o jaiken(c o 952- 832 -2725 (office) o 612 723 -7373 (cell) Jim Eidem, Senior Hydrogeologist o Alternate contact if Kristen Schimpke cannot be reached o jeidem4barr.com o 952- 832 -2763 (office) o 612 803 -5156 (cell) Appendix B Procedures for Tree Removal Procedures for Tree Removal Former GOW Production Areas UMore Park Rosemount, MN The procedures presented in the document are intended to provide safe methods of removing brush and trees that grow in areas of the former Gopher Ordinance Work (GOW) floor slabs and structures. The procedures take into account the potential presence of asbestos containing materials (ACM) or asbestos waste materials (AWM) in the area where the tree cutting activities will take place. Background Virtually all of the GOW buildings were slab -on -grade construction, and most of the buildings are in the process areas that were demolished by the United States government in 1946 and 1947. During the demolition process, reusable building materials were removed where possible for reuse or recycling, and the balance of the structures were demolished. The floor slabs and some structural supports were left in place. Some debris, including broken pieces of Transite® wall board, were left on or near the former building floor slabs. This Transite® wall board material has been tested to contain more than 1% commercial asbestos and is therefore defined as Category II non friable ACM. Over the past 60 years, trees and scrub brush have grown through and around the remaining floor slabs and building materials. The trees and brush prevent access to the slabs and the ground surface, and need to be removed prior to asbestos abatement and excavation and recycling or disposal of the concrete floor slabs and footings. Site Asbestos Abatement and Tree Removal Procedures All areas where tree removal is needed will be initially inspected for ACM by a licensed asbestos inspector, who is employed by the University of Minnesota's Facilities Management Hazardous Materials Program (FMHMP). Suspect ACM will be sampled and tested with Polarized Light Microscopy of Asbestos (Inorganic Method #191). Prior to commencement of tree removal activities, certified asbestos workers will remove the identified ACM from the project area using the following procedures. Appropriate respiratory protection shall be used until such time that an exposure assessment can be provided indicating exposure to asbestos or other hazards for similar tasks is less than the PEL. Other personal protective clothing, including disposable coveralls, gloves, shoe coverlets, or rubber boots, shall be used to help prevent the contamination of the worker. Worker protection is described in detail in a project specific Health and Safety Plan. The asbestos abatement contractor will be responsible for removing the accessible Transite® from the ground and on floor slabs in and around trees. Areas requiring abatement will be cordoned off with caution tape, creating a work area. Transite® material will be wetted and removed by certified asbestos workers. Material may be picked up by hand or with the use of a shovel. Material will be deposited only in properly labeled poly bags or drums. In areas where Transite® material is found on non concrete surfaces, the area will be wetted and six inches of soil will be removed with the Transite®. During the excavation of soil, the licensed asbestos inspector will observe the removal of soil and inspect the residual soil for pieces of Transite®. An additional six inches of soil will be removed if Transite® is observed in the residual soil. If non Transite® suspect ACM is spotted, the material will be assumed to be ACM and the area will be wetted and six inches of soil will be removed; otherwise, work in that area will stop until the sample can be tested and identified. If after sampling, the suspect ACM is identified as ACM, then the area in which the sample was collected will be wetted and six inches of soil will be removed. An additional six inches of soil will be removed if ACM is observed in the residual soil. If after sampling, the suspect ACM is identified as not ACM, then no additional soil will require removal. If excavation of asbestos contaminated soil needs to occur, the soil will be wetted and deposited in a truck lined with 6 mil poly sheeting. The poly will then be folded over and sealed. The truck will be covered to prevent opening of the poly sheeting during transport. Collected ACM will be manifested and disposed at a landfill permitted to accept asbestos waste. Once the identified Transite® ACM has been removed, the FMHMP asbestos inspector will coordinate work with the tree removal contractor. The FMHMP asbestos inspector will re- inspect the ground and floor slabs prior to tree removal. If previously unidentified suspect Transite® ACM is observed, work in that area will stop until the sample can be tested and identified. Appendix C Well Inventory Results BARR Internal amommin Memorandum To: File From: Kristen Betz and Ellen Considine Subject: Well Inventory Results at UMore Mining Area Date: July 1, 2009 Project: 23/19- 0B05.07 SOC 300 c: Jim Eidem A well survey was conducted on July 1, 2009 at the University of Minnesota Outreach, Research, and Experimentation (UMore) Mining Area (UMA). Information collected during the survey included the well diameter, location (e.g., inside pump house), and Unique ID number. The results of the well inventory are provided in Table 1 and shown on Figure 1. The photos taken during the survey are attached. All known wells at the UMA were found with the exception of the following (identified with the Unique Well ID number): Well 207606. Public supply well was reportedly sealed. The reported location is being used for agricultural purposes (corn field). Well 208400. Well type was unknown, but appears to be domestic and reportedly still active. The well is located at a residential property and could not be found. The resident was not at home during the time of the inspection. Well 208405. Domestic well reportedly still active. The well is located at a residential property and could not be found during inspection. The resident was not at home during the time of the inspection. Well 543864. Monitoring well reportedly sealed. A local farmer was not aware of a well in the reported location. Well H48777. Well reportedly still active and likely a public supply well. The reported location is being used for agricultural purposes (corn field). Attachments Table 1 Well Inventory Summary Figure 1 Existing, Sealed and Unknown Wells Appendix Photologs, Well Records P:\Mpls \23 MN \l9 \2319605 UMore park environmental \WorkFiles \Phase 11 Investigation WO #I and #6 \Implementation \SOCs \PH2 Report_V2.0 Appendix \D well records \Dl well survey memo_V2.0. doe w L o a) is c c o 3 0 y 7 0 o a) O o d cn A 0. 0. a) N c 7 7 id 43 E W D O o .n w S 6 o C E v r. Z ti 0 3 a� 0 w ,7.1.; V C C Y itl C 0_. 'I A O E Y O 4-. c.. C O 3 7.-.., 3 U s c E. i 3 ej 0 0 bo bo E v v v 0 a) v v a) 0 a 3 2- 0 b ti o E S E a) 3 3 3 3 3 3 3 3 3 3 C 8. i x.. 0 C 'o 'o U C 2 c "o E ,n n p b0 oh m o by bq o bD b0 O V O 0.a) 0. .O C C O y U U 0 0 y C C C C C C C C C .0 8 C a) a) Q) a) N O 0. p 2 O 0.€ g �D �D �D �D 0- 0 0 0 0 0 0 0 0 0 y' N 0 0 0 0 y 0 0 0 E 0 L0 O ..11 O C O O O O 0 O O O O E bC 3 0 -o O -0, o -0 -o -o 0 .N '3 '3 o u 0 3 3 3 3 E E E E E E E E E o d o bo 0 U 0 0 0 g E ca c c cn •o ro 3 3 3 3 0 0 0 0 0 0 0 0 o w 0 0 o a 2.__ o U U U U U U U U U t aZaaa aaZQ Eww C7 VD °N vNZvZQdQQdddQd a, T L to V y o0 d C V" 1 1 7 N 0 7 N 1 1 N N N N 1 N N N N N N N N ,D 7 O R C 7 VD z d A v E C. 3 g 0 0 0 1 O 0 0 0 0 1 0 0 0 0 0 0 0 1 N V N v C.) V N 0 V 0 O C' A Z Z Z Z Z Z Z Z Z Z Z Z Z Z r z N 00 C to Z H -0 N 0 U C' 0 M u .0 7^ M T 7 \0 \D M M N M V1 N^ M 7 V) 0 7 0^ V) M O T E M O 0 r ,6 V) a .n v6 N N N N 7 ‘D N o0 7 o0 N T 'D 'D O N 00 .n 1, R Cr M N 00: N^ _O T N 7 VD r M V) .n 7 Cr 'D Cr Cr 00 T 00 O O .,0 .E La) O w T 00 T N' O N VD Cl N N N M M M M o0 r N T N M N. 7 00 T a s O N O N N N N N N N N NON N N O N^ N^ N^ y 3 E U Q c W T T T TIT T T rn rn T T T T T Ca T T T o, rn CT T T T T T T o, a H 7n p 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 c 0 ti c d O C C o 0 0 77 0 C u a b�D a) O O T N M I01 O r 00 M C 00 00 r 7 7 M VD V, VD CIO T V) 00 7 00 U i' U C 00 VD N 00 N Vi ..r. N oo .O Vi d; M M 7 W N o0 l� M 0- 00 -p, y N l� M h V) N '0 O N N o0 r .n C r 1. VD 00 00 VD VD M VD 00 00 CT r n Z v.) V V M '.0 N 01 N .0 M M M M M M M 00 O VD VD N N M N T VD OT F- O N N^ M M O O O O T^ T Z. 0 O L O V1 V') V) V7 V) r V1 V1 V') V1 r Vl u) u) V V V) V V) V) V) V) N V) V) 7 V) 7 T T T T T T T T T T T T T T T T T T T T T T T T T T T T 3 A z 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 O a) ro o m U 00 N j .0 7 r Qw C v, a) a) .0 a) a) V 0 a) V 77 73 'p 73 C b e a) a) a) a) V 0 a) V 0 a) 6. 64 J a) a) a) a) a) V a) a) 0 L' U U y U V U U U U N y y y U y y 0 0 0 C../ U U U U U V N C .,v dd v)QQddd QC/ CA CA CA CA CA QQQQQQQQQ d 0 5 C F 00 00 ID a) a) a)'. a) a) a) a) a) 0 73 'C 0 0 'O C 'o a) CO V O 0 V V V V 0 N 1.2. U U B U U U U U U U o 0 g aCOi a`Qi actli aC U U U U U U U U U Z E c Qdcnddaaa< Q a/)e) upun CACACA<<dddQdddd a ii 0 0 o r .'4''I 4. C C N N N T N T VI a) 0 0' 00000* 00 N p O E E O O N O O O N 7." N D m E E N r-1 M N CA. aV CV N O ro f W U U M W W W W U a) a a) a) U U' 6 1R 0 0 0 0 0 E t° 5 33 c' O o o z 3 3 3 3 3 3 33333 to 0 0 b a 2,) a, 0 0 0 0 0 0 2 a ro O a u ti, >T T.o' E' k c c 00000 0 0)0)0)0)0)0)0)0) 0) a o w w a a z u 2 7 2 7 2 7 3 3 3 3 3 3 3 3 :i: a 0 0 0 0 0 0 0 00 ar 0 0 g V C E E E E E E E E O C cc C 0 0 0 0 0 0 0 0 0 O R C 'O T O E 0. a) o O m w c 0 0 0 0 N C 7 00 V) '0 r- oo V) l0 l- O N N M 7 r- 00 T O M 0 O 00 00 M T N 3'0 y U m O O O O O O VD VD VD O T T T T T o0 T 00 00 N 00 0 d N VD VD VD VD VD VD VD 7 7 00 00 00 T 7 7 7 r- c- 7 7 7 7 r-- 7 7 7 C U r- n 0 1: .n N r t` t` N 00 00 M M M M V1 .n M 00 T T T T T O T Cr T 3 0 Q 3 7 0000000000 0 7 7 7 h M M M 7 'D 0 VD VD '0 h 'D 'D ..0 00 y 3 C N N N N N N N N N V) '0'0 h h 0" a` 0" r- ar 0 o w g 4 lik.' -,-;.:14• r L s `t4 .x:400 R W (�y� p x M-B -00 a P i' t U a O N I) f w 1'r7 r zr-1) d r *7606 635498 Ta 54386 635499 M^ 575906 o 1:.+1 Mc' lIl E2- 009" ur'iKl oc rr m b 4:;,.. i 7,712 ':1 r r r`1 f v 71 J7; 0 N 0 d S c Back. rounZh 2008+•erials Expr UMore Mining Area (UMA) Figure 1 UMore Park Boundary EXISTING, SEALED AND Existing well (active) UNKNOWN WELLS Sealed well Allti Phase II Investigation Report Not found, presumed active Feet Sites of Concern 1 -3 and 6 -8 2,000 0 2,000 UMore Mining Area Not found, presumed sealed Dakota County, MN Source Dakota County, James R. Fill, Barr, HKGi. V%11 data is from the Dakota County Well and Water Management System (WELLMAN) and from Barr B MINIIIIIIIIMIll Appendix D Well Survey Photolog Umore Park Property Dakota County, MN July 1, 2009 r i! a 1 fir ilk i E Well 185278 Well 207605 r- dam'. N j j ve 1 lx i �f Mapped Location of Well 207606 Well 207607 4 fii Aiii 4..- '-'4 I 4 Pump House for Well 207608 Well 207615 P: \Mpls\23 MN \19\2319805 UMore park environmental \WorkFiles \Phase II Investigation WO #1 and #6 \Implementation \SOCs\PH2 Report_ V1.1\Appendicies\D \Well Survey_Appendix B_ Photolog F-1 ,t A Y x fk. P L l {p r. ti 1 �n y 1 a t Well 207615 Pump House for Well 207616 a A.... S `1'V :1 ii *i m amp t i-'1 Well 207616 Pump House for Well 20 t N i t A c CV. t: it OP. ,4 t. ;1 w r t r 9 y MAy Well 207617 Well 207617 P: \Mpls\23 MN \19\2319B05 UMore park environmental \WorkFiles \Phase II Investigation WO #1 and #6 \Implementation \SOCs \PH2 Report V1.1\Appendicies \D \Well Survey_Appendix B_ Photolog F-2 Mapped Location of Well 208400 Well 208402 i 1 t f y r j qt"' msµ w l A J J G. 'i w 4 1 1. ..„..4.----- h. i s Well 543862 Well 543863 MONT W i r y,, s r t r yew o, t 4 et O) -w P+ w i of n .'t .\i._:.4" 'I R fi r Y i �d gr. tt. s� \`i%;`r.w Well 575906 Well 63` 497 P: \Mpls\23 MN \19\2319B05 UMore park environmental \WorkFiles \Phase II Investigation WO #1 and #6 \Implementation \SOCs \PH2 Report V1.1 Wppendicies \D \Well Survey_Appendix B_ Photolog F -3 r /4 i, o i„, .,,;..z.. 17:_:..*,-;-,_r_.,1*". ....-i 7 7 *.or,,„"' 17 -7 4„ii ii 3 iir.e t 'Lris, i t' 1` r t r St Wi-, c j —ems V ,4IL, 1/..* C 1 1 414 --"0„,, A ,fi IT. ii,oc Well 635498 Well 635499 I: c ir i i f 3 �``z '''41**„ it "•:.,1° 1 t a x w y ...41114-• ti i Mapped Location of Well H48777 Unknown well at SOC 6 P: \Mpls\23 MN \19\2319B05 UMore park environmental \WorkFiles \Phase II Investigation WO #1 and #6 \Implementation \SOCs \PH2 Report Vi .1 \Appendicies\D\WeII F -4 Survey_Appendix B_ Photolog Well Log Report 00185278 http: /mdh- agua..health. state .mn.us /cwi /well_log.asp ?wellid= 0000185278 Minnesota Unique Well No. MINNESOTA DEPARTMENT OF HEALTH 185278 County Dakota WELL AND BORING Entry Date 04/27/2006 Quad Coates RECORD Update Date 04/27/2006 Quad ID 88A Received Date Minnesota Statutes Chapter 1031 Well Name U OF M ROSEMOUNT #2 Well Depth Depth Completed Date Well Completed Township Range Dir Section Subsections Elevation 951 ft. 310 ft. 310 ft. 10/29/1982 7.5 minute 114 19 W 4 BCDCBC Elevation Method topographic map (4- Drilling Method Non specified Rotary 5 feet) Drilling Fluid Well Hydrofractured? Yes No From Fl. to Ft. Use Irrigation Casing Type Steel (black or low carbon) Joint Welded Drive Shoe? Yes 0 Geological Material Color Hardness From To No AbovelBelow 1 ft. SAND GRAVEL BROWN MEDIUM 0 142 LIMEROCK YELLOW HARD 142 310 Casing Diameter Weight Hole Diameter 10 in. to 145 ft. 40.48 lbs. /ft. 10 in. to 145 ft. Open Hole from 145 ft. to 310 ft. Screen NO Make Type Diameter Slot/Gauze Length Set Between Static Water Level 67 ft. from Land surface Date Measured 10/29/1982 PUMPING LEVEL (below land surface) 80 ft. after 24 hrs. pumping 300 g.p.m. Well Head Completion Pitless adapter manufacturer Model Casing Protection 0 12 in. above grade At -grade (Environmental Wells and Borings ONLY) REMARKS WELL USE DOMESTIC IRRIGATION Grouting Information Well Grouted? li Yes No Grout Material: Bentonite from to 145 ft. Located by: Minnesota Geological Survey Method: Digitization (Screen) Map (1:24,000) Unique Number Verification: Information from Input Date: 04/27/2006 Nearest Known Source of Contamination owner 2000 feet N direction Barnyard type System: UTM- Nad83, Zone15, Meters X: 491000 Y: 4950815 Well disinfected upon completion? Yes No Pump l Not Installed Date Installed 10/29/1982 Manufacturer's name GRUNDFOS Model number C8244J HP 30 Volts 230 Length of drop Pipe 105 ft. Capacity 300 g.p.m Type Submersible Material Galvanized Abandoned Wells Does property have any not in use and not sealed well(s)? Yes 1 No Variance Was a variance granted from the MDH for this well? 0 Yes 0 No Well Contractor Certification First Bedrock Prairie Du Chien Group Maher Well Co. 19301 MANN, G. Aquifer Prairie Du Chien Group Last Strat Prairie Du Chien Group Depth to Bedrock 142 ft. License Business Name Lic. Or Reg. No. Name of Driller County Well Index Online Report 185278 Printed 10/26/2009 HE- 01205 -07 1 of 1 10/26/2009 2:06 PM Well Log Report 00207605 http: /mdh- agua.health. state .mn.us /cwi /well_log.asp ?wellid= 0000207605 Minnesota Unique Well No. MINNESOTA DEPARTMENT OF HEALTH County Dakota WELL AND BORING Entry Date 10/19/1990 207605 Quad Coates Update Date 02/23/2006 Quad ID 88A RECORD Received Date Minnesota Statutes Chapter 1031 Well Name AGRICULTURAL ENGINEERING Well Depth Depth Completed Date Well Completed Township Range Dir Section Subsections Elevation 943 ft. 206 ft. 206 ft 7.5 minute 114 19 W 3 BBAAAD Elevation Method topographic map Drilling Method 5 feet) Drilling Fluid Well Hydrofractured? C Yes No From Ft. to Ft. Use Public Supply /non- community PWS ID Source Casing Type Joint No Information Drive Shoe? Yes No Above/Below Geological Material Color Hardness From To ft. CLAY 0 18 SAND AND GRAVEL 18 60 Casing Diameter Weight Hole Diameter CLAYEY GRAVEL AND BOULDERS 60 78 CLAY BROWN 78 89 CLAY BLUE 89 130 CLAYEY GRAVEL 130 139 CLAYEY GRAVEL AND BOULDERS BROWN 139 151 (Open Hole from ft. to ft. PRAIRIE DU CHIEN LIMESTONE 151 206 Screen Make Type Diameter Slot/Gauze Length Set Between Static Water Level ft. from Date Measured PUMPING LEVEL (below land surface) ft. after hrs. pumping g.p.m. Well Head Completion Pitless adapter manufacturer Model J Casing Protection 7 12 in. above grade El At -grade (Environmental Wells and Borings ONLY) N O REMARKS Grouting Information Well Grouted? 0 Yes 0 No Located by: Minnesota Geological Method: Digitized scale 1:24,000 or larger Survey (Digitizing Table) Unique Number Verification: N/A Input Date: 01/01/1990 Nearest Known Source of Contamination System: UTM- Nad83,Zone15, feet direction _type X 492808 Y: 4951477 Meters disinfected upon completion? 0 Yes No Pump 0 Not Installed Date Installed Manufacturer's name Model number_ HP_ Volts Length of drop Pipe fi, Capacity_g.p.m Type Material Abandoned Wells Does property have any not in use and not sealed well(s)? 0 Yes No Variance Was a variance granted from the MDH for this well? D Yes I.7 No Well Contractor Certification First Bedrock Prairie Du Chien Group Aquifer Last Strat Prairie Du Chien Group Depth to Bedrock 151 ft. License Business Name Lic. Or Reg. No. Name of Driller County Well Index Online Report 207605 Printed 10/26/2009 HE- 01205 -07 1 of 1 10/26/2009 2:06 PM Well Log Report 00207606 http: /mdh -agua. health. state .mn.us /cwi /well_tog.asp ?wellid= 0000207606 Minnesota Unique Well No. MINNESOTA DEPARTMENT OF HEALTH County Dakota WELL AND BORING Entry Date 10/19/1990 207606 Quad Coates RECORD Update Date 02/23/2006 Quad ID 88A Received Date Minnesota Statutes Chapter 1031 Well Name DAIRY FARM Well Depth Depth Completed Date Well Completed Township Range DirSection Subsections Elevation 954 ft. 429 ft. 429 ft. 7.5 minute 114 19 W 4 BBACBB Elevation Method topographic map (44- Drilling Method 5 feet) Drilling Fluid Well Hydrofractured? 0 Yes �7 No From Ft. to Ft. Use Abandoned Status Sealed Casing Type Joint No Information Drive Shoe? Yes No Above /Below Geological Material Color Hardness From To ft. TOPSOIL BLACK 0 2 SANDY CLAY 2 5 Casing Diameter Weight Hole Diameter HARDPAN 5 102 SANDY CLAY BLUE 102 125 SANDY CLAY BROWN 125 135 FINE ROTTEN SANDROCK BROWN 135 153 Open Hole from if to ft. FINE DIRTY SAND AND GRAVEL 153 162 DOLOMITE 162 263 Screen Make Type DOLOMITE STREAKS OF SAND 263 325 DOLOMITE 325 355 Diameter Slot/Gauze Length Set Between DOLOMITE (TRACES OF SAND) 355 366 JORDAN SANDROCK 366 429 Static Water Level ft. from Date Measured PUMPING LEVEL (below land surface) ft. after hrs.pumping g.p.m. Well Head Completion Pitless adapter manufacturer Model Casing Protection 0 12 in. above grade At -grade (Environmental Wells and Borings ONLY) REMARKS WELL SEALED 10 -09 -1996 BY 19521. Grouting Information Wet Grouted? El Yes No ORIGINAL USE PS PUBLIC SUPPLYMON- COMMUNITY. Located by: Minnesota Geological Method: Digitized scale 1:24000 or larger Survey (Digitiang T able) Nearest Known Source of Contamination Unique Number Verification: N/A Input Date: 01/01/1990 _feet direction _type System: UTM Nad83, Zone15, X: 490976 Y: 4951431 D Meters Well disinfected upon completion? Yes No Pump 0 Not Installed Date Installed Manufacturer's name Model number_ HP_ Volts Length of drop Pipe _ft. Capacity_g.p.m Type Material Abandoned Wells Does propertyhaee any not in use and not sealed well(s)? n Yes D No Variance Was a variance granted from the MDH for this well? 0 Yes 0 No Well Contractor Certification First Bedrock Prairie Du Chien Group Aquifer Last Strat Jordan Depth to Bedrock 162 ft. License Business Name Lic. Or Reg. No. Name of Driller County Well Index Online Report 207606 Printed 10/26/2009 HE- 01205 -07 1 of 1 10/26/2009 2:05 PM Well Log Report 00207607 http: /mdh -agua. health. state .mn.us /cwi /well_log.asp ?wellid= 0000207607 Minnesota Unique Well No. MINNESOTA DEPARTMENT OF HEALTH County Dakota WELL AND BORING Entry Date 10/19/1990 207607 Quad Coates Update Date 07/30/2009 Quad ID 88A RECORD Received Date Minnesota Statutes Chapter 1031 Well Name WORKMAN'S CHANGE HOUSE Well Depth Depth Completed Date Well Completed Township Range Dir Section Subsections Elevation 945 ft. 170 ft. 170 ft. 7.5 minute 114 19 W 4 AAACBC Elevation Method topographic map Drilling Method 5 feet) Well Address Drilling Fluid Well Hydrofractured? 0 Yes No ROSEMOUNT MN 55068 From Ft. to Ft. Use Public Supply /non- community PINS ID Source Geological Material Color Hardness From To CLAY 0 5 Casing Type Joint No Information Drive Shoe? 0 Yes 0 No Above/Below GRAVEL 5 35 ft. CLAY BLUE 35 130 CLAY, SAND, HARDPAN AND GRAVEL RED 130 150 Casing Diameter Weight Hole Diameter PRAIRIE DU CHIEN LIMESTONE 150 170 1 Open Hole from ft. to ft. Screen Make Type Diameter Slot/Gauze Length Set Between Static Water Level ft. from Date Measured PUMPING LEVEL (below land surface) ft. after hrs. pumping g.p.m. Well Head Completion Pitless adapter manufacturer Model Casing Protection 0 12 in. above grade At -grade (Environmental Wells and Borings ONLY) REMARKS AT STATION SERVICE CENTER. Grouting Information Well Grouted? Yes 0 No Located by: Minnesota Geological Method: Digitized scale 1:24,000 or larger Survey (Digitizing Table) Unique Number Verification: N/A Input Date: 01/01 /1990 Nearest Known Source of Contamination System: UTM Nad83, Zone15, X: 492208 Y: 4951411 _feet _direction _type Meters Well disinfected upon completion? t�l Yes 0 No Pump Not Installed Date Installed Manufacturer's name Model number_ HP_ Volts Length of drop Pipe _ft. Capacity_g.p.m Type Material Abandoned Wells Does property ha* any not in use and not sealed well(s)? Cl Yes Li No Variance Was a variance granted from the MDH for this well? Yes CI No Well Contractor Certification First Bedrock Prairie Du Chien Group Aquifer Last Strat Prairie Du Chien Group Depth to Bedrock 150 ft. License Business Name Lic. Or Reg. No. Name of Driller County Well Index Online Report 207607 Printed 10/26/2009 HE- 01205 -07 1 of 1 10/26/2009 2:05 PM Well Log Report 00207608 http: /mdh -agua. health. state .mn.us /cwi /well_log.asp ?wellid= 0000207608 Minnesota Unique Well No. MINNESOTA DEPARTMENT OF HEALTH County Dakota WELL AND BORING Entry Date 10/19/1990 207608 Quad Coates RECORD Update Date 02/23/2006 Quad ID 88A Received Date Minnesota Statutes Chapter 1031 Well Name AG. EXPERIMENT STATION Well Depth Depth Completed Date Well Completed Township Range Dir Section Subsections Elevation 948 ft. 415 ft. 415 ft. 11/30/1960 7.5 minute 114 19 W 4 DACADD Elevation Method topographic map Drilling Method Cable Tool 5 feet) Drilling Fluid Well Hydrofractured? 0 Yes 0 No From Ft. to Ft. Use Public Supply /non community PWS ID Source Casing Type Steel (black or low carbon) Joint No Information Drive Shoe? 0 Yes Geological Material Color Hardness From To TOPSOIL 0 2 No Above/Below 0 ft. SAND 2 72 Weight Hole Diameter SANDSTONE 72 105 Casing Diameter 9 SAND AND GRAVEL 105 120 10 in. to 148 ft. Ibs./ft. 6 in. to 415 ft. SHALE AND GRAVEL 120 130 SAND AND GRAVEL 130 148 6 in. to 355 ft. Ibs./ft. PRAIRIE DU CHIEN DOLOMITE 148 340 I Open Hole from 355 ft. to 415 It JORDAN SANDROCK 340 415 Screen NO Make Type Diameter Slot/Gauze Length Set Between Static Water Level 68 ft. from Land surface Date Measured 11/30/1960 PUMPING LEVEL (below land surface) 77 ft. after hrs. pumping 100 g.p.m. Well Head Completion Pitless adapter manufacturer Model i- Casing Protection 0 12 in. above grade C; At -grade (Enironmental Wells and Borings ONLY) REMARKS WELL DRILLED BYANDERSON WELL CO. FROM ROCHESTER. Grouting Information Well Grouted? D Yes 0 No Located by: United States Geological Method: Digitimd scale 1:24,000 or larger Suney (Digitizing Table) Unique Number Verification: N/A Input Date: 01/01/1990 Nearest Known Source of Contamination System: UTM Nad83, Zone15, X: 491962 Y: 4950085 _feet _direction _type Meters Well disinfected upon completion? 0 Yes 0 No Pump Not Installed Date Installed Manufacturer's name Model number_ HP0 Volts Length of drop Pipe Capacity_g.p.m Type Material Abandoned Wells Does property haIR any not in use and not sealed well(s)? 0 Yes r* No Variance Was a variance granted from the MDH for this well? 0 Yes 0 No Well Contractor Certification First Bedrock Prairie Du Chien Group Aquifer Jordan Last Strat Jordan Depth to Bedrock 148 ft. License Business Name Lic, Or Reg. No. Name of Driller County Well Index Online Report 207608 Printed 10 /26/2009 HE- 01205 -07 1 of 1 10/26/2009 2:10 PM Well Log Report 00207615 http: /mdh -agua. health. state .mn.us /cwi /well_log.asp ?wellid= 0000207615 Minnesota Unique Well No. MINNESOTA DEPARTMENT OF HEALTH County Dakota WELL AND BORING Entry Date 09/15/1988 207615 Quad Coates Update Date 03/24/2006 Quad ID 88A RECORD Received Date Minnesota Statutes Chapter 1031 Well Name POULTRY FARM Well Depth Depth Completed Date Well Completed Township Range Dir Section Subsections Elevation 955 ft. 432 ft. 432 ft. 00/00/1960 7.5 minute 115 19 W 33 ADBACC Elevation Method topographic map (d- Drilling Method 5 feet) Drilling Fluid Well Hydrofractured? 0 Yes No From Ft. to Ft. Use Domestic Casing Type Joint No Information Drive Shoe? 0 Yes 0 No Above/Below Geological Material Color Hardness From To ft. SANDY DRIFT BROWN 0 45 CLAY GRAY 45 120 Casing Diameter Weight Hole Diameter SAND AND GRAVEL 120 142 REMNANTS OF ST. PETER SANDSTONE 142 181 ONEOTA SHAKOPEE LIMEROCK 181 350 JORDAN SANDSTONE 350 432 Open Hole from ft. to ft. Screen Make Type Diameter Slot/Gauze Length Set Between Static Water Level ft. from Date Measured PUMPING LEVEL (below land surface) ft. after hrs. pumping g.p.m. Well Head Completion Pitless adapter manufacturer Model El Casing Protection 0 12 in. above grade C 1 At -grade (Emnronmental Wells and Borings ONLY) N 0 REMARKS Grouting Information Well Grouted? 0 Yes 0 No Located by: Minnesota Geological Survey Method: Digiti�d -scale 1:24,000 or larger (Digit Zing Table) Unique Number Verification: Information Input Date: 01/01/1990 Nearest Known Source of Contamination from owner _feet _direction _type System: UTM Nad83, Zonel5, Meters X: 492112 Y: 4952660 Well disinfected upon completion? 0 Yes 0 No Pump Not Installed Date Installed Manufacturer's name Model number_ HP Volts Length of drop Pipe 2. Capacity_g.p.m Type Material Abandoned Wells Does property have any not in use and not sealed well(s)? 0 Yes 0 No Variance Was a variance granted from the M DH for this well? 0 Yes 0 No Well Contractor Certification First Bedrock St.Peter Aquifer Last Strat Jordan Depth to Bedrock 142 ft. License Business Name Lic. Or Reg. No. Name of Driller County Well Index Online Report 207615 Printed 10 /26/2009 HE- 01205 -07 1 of 1 10/26/2009 2:07 PM Well Log Report 00208400 http: /mdh -agua. health. state .mn.us /cwi /well_log.asp ?wellid= 0000208400 Minnesota Unique Well No. MINNESOTA DEPARTMENT OF HEALTH County Dakota Entry Date 03/30/1990 208400 Quad Coates WELL AND BORING Update Date 03/242006 Quad ID 88A RECORD Received Date Minnesota Statutes Chapter 1031 Well Name AG. EXP. STATION ROSEMOU Well Depth Depth Completed Date Well Completed Township Range Dir Section Subsections Elevation 950 ft. 153 ft. 153 ft. 02/00/1959 7.5 minute 115 19 W 28 DCCCBB Elevation Method topographic map Drilling Method 5 feet) Drilling Fluid Well Hydrofractured? 0 Yes 0 No From Ft. to Ft. Use Casing Type Joint No Information Drive Shoe? Yes Geological Material Color Hardness From To No Above/Below 0 ft. LOAM CLAY 0 3 CLAY& GRAVEL 3 60 Casing Diameter Weight Hole Diameter GRAVEL CLAY MIXTURE 60 93 6 in to 107 ft. lbs./ft. SANDSTONE 93 153 LIMESTONE 153 153 Open Hole from 107 ft. to 153 ft. Screen NO Make Type Diameter Slot/Gauze Length Set Between Static Water Level 98 ft. from Land surface Date Measured 02/00/1959 PUMPING LEVEL (below land surface) 98 ft. after 6 hrs. pumping 30 g.p.m. Well Head Completion Pitless adapter manufacturer Model t Casing Protection 0 12 in. above grade :7.7 At -grade (Environmental Wells and Borings ONLY) N O REMARKS Grouting Information Well Grouted? 0 Yes 0 No Located by: Minnesota Geological Suney Method: Digitimd scale 1:24,000 or larger (Digitiang Table) Unique Number Verification: Information Input Date: 01/01 /1990 Nearest Known Source of Contamination from owner _feet direction ,type System: UN Nad83, Zone15, Meters X: 491622 Y: 4953262 Well disinfected upon completion? Yes C 1 No Pump E7 Not Installed Date Installed Manufacturer's name Model number_ HP0 Volts Length of drop Pipe_ft. Capacity_g.p.m Type Material Abandoned Wells Does property have any not in use and not sealed well(s)? Yes Cl No Variance Was a variance granted from the MPH for this well? Yes Ct No Well Contractor Certification First Bedrock St.Peter Corcoran Well Co. 19163 Aquifer St.Peter- Prairie Du Chien Last Strat Prairie Du Chien Group Depth to Bedrock 93 ft. License Business Name Lic. Or Reg. No. Name of Driller County Well Index Online Report 208400 Printed 10/26/2009 HE- 01205 -07 1 of 1 10/26/2009 2:10 PM Well Log Report 00208402 http: /mdh -agua. health. state .mn.us /cwi /well log.asp ?wellid 0000208402 Minnesota Unique Well No. MINNESOTA DEPARTMENT OF HEALTH County Dakota WELL AND BORING Entry Date 09/15/1988 208402 Quad Coates RECORD Update Date 03/24/2006 Quad ID 88A Received Date Minnesota Statutes Chapter 1031 Well Name UNIV. OF MN. OFFICE BLDG. Well Depth Depth Completed Date Well Completed Township Range Dir Section Subsections Elevation 950 ft. 166 ft. 166 ft 12/00/1957 7.5 minute 115 19 W 33 DDDCC Elevation Method topographic map Drilling Method 5 feet) Well Address 1605 160TH' ST W Drilling Fluid Well Hydrofractured? 0 Yes 0 No ROSEMOUNT MN 55068 From Ft. to Ft. Use Domestic Geological Material Color Hardness From To CLAY GRAVEL IN LAYERS 0 30 Casing Type Steel (black or low carbon) Joint No Information Drive Shoe? 0 Yes CLAY IN LAYERS 30 158 Ti WATER BEARING SAND 158 161 No Above/Below 0 ft. LIMEROCK 161 166 g h Casing Diameter Weight Hole Diameter 4 in. to 161 ft. lbs. /ft. 4 in. to 166 ft. 1 Open Hole from 161 ft. to 166 ft. Screen NO Make Type Diameter Slot/Gauze Length Set Between Static Water Level 75 ft. from Land surface Date Measured 12/00/1957 PUMPING LEVEL (below land surface) ft. after 4 hrs. pumping 14 g.p.m. Well Head Completion Pitless adapter manufacturer Model C Casing Protection 0 12 in. above grade At -grade (Environmental Wells and Borings ONLY) REMARKS WELL DRILLED BYBEAUDETTE WELL CO. Grouting Information Well Grouted? 0 Yes 0 No Located by: Minnesota Geological Surrey Method: Digitized -scale 1:24,000 or larger (Digitiang Table) Unique Number Verification: Information Input Date: 01/01 /1990 Nearest Known Source of Contamination from owner feet _direction _type System: UTM- Nad83, Zone15, Meters X: 492206 Y: 4951607 Well disinfected upon completion? 0 Yes 0 No Pump l Not Installed Date Installed Manufacturer's name Model number_ HP0 Volts Length of drop Pipe_ft. Capacity_g.p.m Type Material Abandoned Wells Does property hae any not in use and not sealed well(s)? 0 Yes 0 No Variance Was a variance granted from the M DH for this well? 0 Yes 0 No Well Contractor Certification First Bedrock Prairie Du Chien Group Aquifer Prairie Du Chien Group Last Strat Prairie Du Chien Group Depth to Bedrock 161 ft. License Business Name Lic. Or Reg. No. Name of Driller County Well Index Online Report 208402 Printed 10/26/2009 HE- 01205 -07 1 of 1 10/26/2009 2:11 PM Well Log Report 543862 http: /mdh -agua. health. state .mn.us /cwi /well_log.asp ?wellid= 0000543862 Minnesota Unique Well No. MINNESOTA DEPARTMENT OF HEALTH County Dakota WELL AND BORING Entry Date 10/28/2008 543862 Quad RECORD Update Date 10/28/2008 Quad ID Received Date Minnesota Statutes Chapter 1031 Well Name MW -1 Well Depth Depth Completed Date Well Completed Township Range Dir Section Subsections Elevation ft. 65 ft. 63 ft. 04/11/1994 114 19 W 3 BBD Elevation Method Drilling Method Auger (non-specified) Well Address 1605 160TH ST Drilling Fluid Well Hydrofractured? n Yes L� No ROSEMOUNT MN From Ft. to Ft. Use Monitor well Geological Material Color Hardness From To FILL DENSE 0 4 Casing Type Steel (black or low carbon) Joint No Information Drive Shoe? Yes F -C SAND MED DENSE BROWN 4 19 r F-M SAND MED DENSE BROWN 19 29 No Above /Below ft. F -M SAND W/ GRAVEL MED DENSE BROWN 29 34 M-C SAND W/ GRAVEL M DENSE BROWN 34 39 Casing Diameter Weight Hole Diameter F -M SAND LITTLE GRAVEL M DENSE BROWN 39 65 2 in. to 53 ft. Ibs./ft. 8 in. to 65 ft. Open Hole from ft. to ft. Screen YES Make JOHNSON Type stainless steel Diameter Slot/Gauze Length Set Between 2 10 10 53 ft. and 63 ft. Static Water Level 56 ft. from Land surface Date Measured 04/11/1994 PUMPING LEVEL (below land surface) ft. after hrs.pumping g.p.m. Well Head Completion Pitless adapter manufacturer Model Y: Casing Protection Y 21 12 in. above grade At -grade (Environmental Wells and Borings ONLY) N 0 REMARKS Grouting Information Well Grouted? Yes n No Grout Material: Neat Cement from to 48 ft. Nearest Known Source of Contamination _feet _direction _type Well disinfected upon completion? Yes 0 No Pump n Not Installed Date Installed Manufacturer's name Model number_ HP_ Volts Length of drop Pipe _ft. Capacity_g.p.m Type Material Abandoned Wells Does property have any not in use and not sealed well(s)? n Yes No Variance Was a variance granted from the M DH for this well? 0 Yes n No Well Contractor Certification First Bedrock Aquifer Dpra M0054 BURANDT,P Last Strat Depth to Bedrock ft. License Business Name Lic. Or Reg. No. Name of Driller County Well Index Online Report 543862 Printed 10/26/2009 HE- 01205 -07 1 of 1 10/26/2009 2:11 PM Well Log Report 543863 http: /mdh -agua. health. state .mn.us /cwi /well_log.asp ?wellid= 0000543863 Minnesota Unique Well No. MINNESOTA DEPARTMENT OF HEALTH County Dakota Entry Date 10/28/2008 WELL AND BORING 543863 Quad Update Date 10/28/2008 Quad ID RECORD Received Date Minnesota Statutes Chapter 1031 Well Name MW -2 Well Depth Depth Completed Date Well Completed Township Range Dir Section Subsections Elevation ft. 65 ft. 63 ft. 04/12/1994 114 19 W 3 BBD Elevation Method Drilling Method Non specified Rotary Drilling Fluid Well Hydrofractured? Q Yes El No From Ft. to Ft. Use Monitor well Casing Type Steel (black or low carbon) Joint No Information Drive Shoe? Yes Geological Material Color Hardness From To M-C SAND GRAVEL M -DENSE BROWN 0 14 No No Above /Below ft. F -M SAND M DENSE BROWN 14 29 M-C SAND W/ GRAVEL M DENSE BROWN 29 44 Casing Diameter Weight Hole Diameter F -C SAND M DENSE BROWN 44 49 2 in. to 53 ft. Ibs./ft. 8 in. to 65 ft. F -M SAND M DENSE BROWN 49 54 M-C SAND M DENSE BROWN 54 65 Open Hole from ft. to ft. Screen YES Make JOHNSON Type stainless steel Diameter Slot/Gauze Length Set Between 2 10 10 53 ft. and 63 ft. Static Water Level 56 ft. from Land surface Date Measured 04/12/1994 PUMPING LEVEL (below land surface) ft. after hrs. pumping g.p.m. Well Head Completion Pitless adapter manufacturer Model Casing Protection Y 12 in. above grade At -grade (Environmental Wells and Borings ONLY) NO REMARKS Grouting Information Well Grouted? Yes E No Grout Material: Neat Cement from to 48 ft. Nearest Known Source of Contamination _feet _direction _type Well disinfected upon completion? 0 Yes No Pump 0 Not Installed Date Installed Manufacturer's name Model number_ HP_ Volts Length of drop Pipe_ft. Capacity_g.p.m Type Material Abandoned Wells Does property have anynot in use and not sealed well(s)? Yes No Variance Was a variance granted from the MDH for this well? Yes No Well Contractor Certification First Bedrock Aquifer Dpra M0054 BURANDT,P Last Strat Depth to Bedrock ft. License Business Name Lic. Or Reg. No. Name of Driller County Well Index Online Report 543863 Printed 10/26/2009 HE- 01205 -07 1 of 1 10/26/2009 2:12 PM Well Log Report 543864 http: /mdh -agua. health. state .mn.us /cwi /well_log.asp ?wellid= 0000543864 Minnesota Unique Well No. MINNESOTA DEPARTMENT OF HEALTH County Dakota WELL AND BORING Entry Date 10/28/2008 543864 Quad RECORD Update Date 10/28/2008 Quad ID Received Date Minnesota Statutes Chapter 1031 Well Name MW -3 Well Depth Depth Completed Date Well Completed Township Range Dir Section Subsections Elevation ft. 65 ft. 63 ft. 04/13/1994 114 19 W 3 BBD Elevation Method Drilling Method Auger(non- specified) Well Address Drilling Fluid Well H Q 1605 160TH ST W Hydrofractured? Yes No ROSEMOUNT MN From Ft. to Ft. Use Monitor well Geological Material Color Hardness From To M-C SAND M DENSE BROWN 0 9 Casing Type Steel (black or low carbon) Joint No Information Drive Shoe? Yes F -M SAND W/ GRAVEL M DENSE BROWN 9 19 El No Above/Below ft. F -M SAND M DENSE BROWN 19 29 M-C SAND W/ GRAEL M DENSE BROWN 29 39 Casing Diameter Weight Hole Diameter F -M SAND M DENSE BROWN 39 65 2 in. to 53 ft. lbs./ft. 8 in. to 65 ft. Open Hole from ft. to ft. Screen YES Make JOHNSON Type stainless steel Diameter Slot/Gauze Length Set Between 0 10 10 53 ft. and 63 ft. Static Water Level 56 ft. from Land surface Date Measured 04/13/1994 PUMPING LEVEL (below land surface) ft. after hrs. pumping g.p.m. Well Head Completion Pitless adapter manufacturer Model Casing Protection Y 12M. above grade C At -grade (Environmental Wells and Borings ONLY N0 REMARKS Grouting Information Well Grouted? O Yes 0 No Grout Material: Neat Cement from to 48 ft. Nearest Known Source of Contamination _feet _direction _type Well disinfected upon completion? Yes 0 No Pump Not Installed Date Installed Manufacturer's name Model number_ HP_ Volts Length of drop Pipe _2. Capacity_g.p.m Type Material Abandoned Wells Does property have any not in use and not sealed well(s)? Yes No Variance Was a variance granted from the MDH for this well? 0 Yes 0 No Well Contractor Certification First Bedrock Aquifer Dpra M0054 BURANDT, P Last Strat Depth to Bedrock ft. License Business Name Lic. Or Reg. No. Name of Driller County Well Index Online Report 543864 Printed 10/26/2009 HE- 01205 -07 1 of 1 10/26/2009 2:12 PM Well Log Report 575906 http: /mdh -agua. health. state .mn.us /cwi /well_log.asp ?wellid= 0000575906 Minnesota Unique Well No. MINNESOTA DEPARTMENT OF HEALTH County Dakota WELL AND BORING Entry Date 10/28/2008 575906 Quad RECORD Update Date 10/28/2008 Quad ID Received Date Minnesota Statutes Chapter 1031 Well Name MW -1 Well Depth Depth Completed Date Well Completed Township Range Dir Section Subsections Elevation ft. 63 ft. 63 ft. 12/02/1995 114 19 W 4 MC Elevation Method Drilling Method Auger(non- specified) Well Address 1605 160TH ST W Drilling Fluid Well Hydrofractured? Q Yes 0 No ROSEMOUNT MN From Ft. to Ft. Use Monitor well Geological Material Color Hardness From To GRAVELY SAND COBBLES COARSE BROWN 0 4 Casing Type Steel (black or low carbon) Joint No Information Drive Shoe? D Yes SAND GRAVEL MED COARSE LT. BRN 4 48 SILTY SANDY CLAY LT. BRN 48 56 No Above/Below ft. SILTY SAND SAND LT. BRN 56 63 Casing Diameter Weight Hole Diameter 2 in. to 53 ft. Ibs./ft. 8.25 in. to 63 ft. Open Hole from ft. to ft. Screen YES Make TIMCO Type plastic Diameter Slot/Gauze Length Set Between 2 10 10 53 ft. and 63 ft. Static Water Level 55 ft. from Land surface Date Measured 12/02/1995 PUMPING LEVEL (below land surface) ft. after hrs.pumping g.p.m. Well Head Completion Pitless adapter manufacturer Model Casing Protection Y 1 2 in. above grade At -grade (Environmental Wells and Borings ONLY) NO REMARKS Grouting Information Well Grouted? E;7 Yes 0 No Grout Material: Bentonite from 49 to 51 ft. 2 bags Grout Material: Neat Cement from to 49 ft. 30 bags Nearest Known Source of Contamination _feet direction _type Well disinfected upon completion? 0 Yes No Pump Not Installed Date Installed Manufacturer's name Model number HP_ Volts Length of drop Pipe _ft. Capacity_g.p.m Type Material Abandoned Wells Does property have any not in use and not sealed well(s)? 0 Yes L'. No Variance Was a variance granted from the M DH for this well? 0 Yes El No Well Contractor Certification First Bedrock T hein Well Co. 34050 THEIN, M Aquifer Last Strat Depth to Bedrock ft. License Business Name Lic. Or Reg. No. Name of Driller County Well Index Online Report 575906 Printed 10/26/2009 HE- 01205 -07 1 of 1 10/26/2009 2:13 PM Well Log Report 00635497 http /mdh -agua. health. state .mn.us /cwi /well_log.asp ?wellid= 0000635497 Minnesota Unique Well No. MINNESOTA DEPARTMENT OF HEALTH County Dakota WELL AND BORING Entry Date 05/29/2001 635497 Quad RECORD Update Date 10/28/2008 Quad ID Received Date Minnesota Statutes Chapter 1031 Well Name MW -2 Well Depth Depth Completed Date Well Completed Township Range Dir Section Subsections Elevation ft. 50 ft. 50 ft. 11/29/1999 114 19 W 4 MD Elevation Method Drilling Method Auger (non- specified) Well Address 1605 160TH ST W Drilling Fluid Well Hydrofractured? Yes E No ROSEMOUNT MN From Ft. to Ft. Use Abandoned Status Sealed Geological Material Color Hardness From To TOP SOIL, SAND ROCKS BROWN MEDIUM 0 3 Casing Type Steel (black or low carbon) Joint No Information Drive Shoe? Yes SAND GRAVEL BROWN MEDIUM 3 8 No AbovelBelow fL SAND GRAVEL MED COARSE BROWN 8 35 ROCKY SAND GRAVEL M COARSE BROWN 35 43 WET GRAVELY SAND M COARSE BROWN 43 50 Casing Diameter Weight Hole Diameter 2 in. to 40 ft. 3.65 lbs. /ft. 4.25 in. to 50 ft. Open Hole from ft. to ft. Screen YES Make TIMCO Type plastic Diameter Slot/Gauze Length Set Between 2 10 10 40 ft. and 50 ft. Static Water Level 43 ft. from Land surface Date Measured 11/29/1999 PUMPING LEVEL (below land surface) ft. after hrs. pumping g.p.m. Well Head Completion Pitless adapter manufacturer Model Casing Protection Y 12 in. above grade L i At -grade (Environmental Wells and Borings ONLY) REMARKS WELL SEALED 11 -01 -2001 BY71677 Grouting Information Well Grouted? n Yes No ORIGINAL USE MW- MONITOR WELL Grout Material: Neat Cement from 0 to 35 ft. 3 as Grout Material: Bentonite from 35 to 37 ft. 1 bags Nearest Known Source of Contamination _feet direction _type Well disinfected upon completion? 0 Yes 0 No Pump 0 Not Installed Date Installed Manufacturer's name Model number_ HP_ Volts Length of drop Pipe_ft. Capacity_g.p.m Type Material Abandoned Wells Does property have any not in use and not sealed well(s)? Yes No Variance Was a variance granted from the M DH for this well? 0 Yes No Well Contractor Certification First Bedrock Aquifer Thein Well Co. 34625 HERRBOLDT, N. Last Strat Depth to Bedrock ft License Business Name Lic. Or Reg. No. Name of Driller County Well Index Online Report 635497 Printed 10/26/2009 HE- 01205 -07 1 of 1 10/26/2009 2:13 PM Well Log Report 00635498 http: /mdh -agua. health. state. mn. us /cwi /well_log.asp ?wellid= 0000635498 Minnesota Unique Well No. MINNESOTA DEPARTMENT OF HEALTH County Dakota WELL AND BORING Entry Date 05/29/2001 635498 Quad Update Date 10/28/2008 Quad ID RECORD Received Date Minnesota Statutes Chapter 1031 Well Name MW -3 Well Depth Depth Completed Date Well Completed Township Range DirSection Subsections Elevation ft. 50 ft. 50 ft. 11/30/1999 114 19 W 4 MD Elevation Method Drilling Method Auger (non- specified) Well Address 1605 160TH ST W Drilling Fluid Well Hydrofractured? C3 Yes 21 No ROSEMOUNT MN From Ft. to Ft. Use Abandoned Status Sealed Geological Material Color Hardness From To TOP SOIL, GRAVELY SAND BROWN MEDIUM 0 3 Casing Type Steel (black or low carbon) Joint No Information Drive Shoe? Yes GRAVELY SAND MED COARSE BROWN 3 38 SANDY CLAY BROWN MEDIUM 38 50 No Above /Below ft. Casing Diameter Weight Hole Diameter 2 in. to 40 ft. 3.65 lbs. /ft. 4.25 in. to 50 ft. Open Hole from ft. to ft. Screen YES Make TIMCO Type plastic Diameter Slot/Gauze Length Set Between 2 10 10 40 ft. and 50 ft. Static Water Level 45 ft. from Land surface Date Measured 11/30/1999 PUMPING LEVEL (below land surface) ft. after hrs. pumping g.p.m. Well Head Completion Pitless adapter manufacturer Model 1 Casing Protection Y 12 in. above grade At -grade (Environmental Wells and Borings ONLY) REMARKS WELL SEALED 11 -01 -2001 BY71677 Grouting Information Well Grouted? Yes No ORIGINAL USE MW- MONITOR WELL Grout Material: Neat Cement from 0 to 35 ft. 3 bags Grout Material: Bentonite from 35 to 37 ft. 1 bags Nearest Known Source of Contamination _feet _direction _type Well disinfected upon completion? Yes 0 No Pump C3 Not Installed Date Installed Manufacturer's name Model number_ HP_ Volts Length of drop Pipe _ft. Capacity_g.p.m Type Material Abandoned Wells Does property have any not in use and not sealed well(s)? 0 Yes No Variance Was a variance granted from the MDH for this well? Yes Ej No Well Contractor Certification First Bedrock Aquifer Thein Well Co. 34625 HERRBOLDT, N. Last Strat Depth to Bedrock ft. License Business Name Lic. Or Reg. No. Name of Driller County Well Index Online Report 635498 Printed 10/26/2009 HE- 01205 -07 1 of 1 10/26/2009 2:13 PM Well Log Report 00635499 http: /mdh- agua.health. state .mn.us /cwi /well_log.asp ?wellid= 0000635499 Minnesota Unique Well No. MINNESOTA DEPARTMENT OF HEALTH County Dakota WELL AND BORING Entry Date 05/29/2001 635499 Quad Update Date 10/28/2008 Quad ID RECORD Received Date Minnesota Statutes Chapter 1031 Well Name MW -4 Well Depth Depth Completed Date Well Completed Township Range DirSection Subsections Elevation ft. 59 ft, 59 ft. 11/30/1999 114 19 W 4 MD Elevation Method Drilling Method Auger (non-specified) Well Address 1605 160TH ST W Drilling Fluid Well Hydrofractured? El Yes No ROSEMOUNT MN From Ft. to Ft. Use Abandoned Status Sealed Geological Material Color Hardness From To SANDY CLAY GRAVEL BROWN MEDIUM 0 5 Casing Type Steel (black or low carbon) Joint No Information Drive Shoe? Yes GRAVELY SAND MED COARSE BROWN 5 40 No Above/Below ft. GRAVELY SAND BROWN MEDIUM 40 48 SAND YELLOW MEDIUM 48 59 Casing Diameter Weight Hole Diameter 2 in. to 49 ft. 3.65 lbs. /ft. 4.25 in. to 59 ft. Open Hole from ft. to ft. Screen YES Make TIMCO Type plastic Diameter Slot/Gauze Length Set Between 2 10 10 49 ft. and 59 ft. Static Water Level 52 ft. from Land surface Date Measured 11/30/1999 PUMPING LEVEL (below land surface) ft. after hrs. pumping g.p.m. Well Head Completion Pitless adapter manufacturer Model Casing Protection Y 12 in. above grade El At -grade (Environmental Wells and Borings ONLY) REMARKS WELL SEALED 11 -01 -2001 BY71677 Grouting Information Well Grouted? Yes No ORIGINAL USE MW- MONITOR WELL Grout Material: Neat Cement from 0 to 44 ft. 3 bags Grout Material: Bentonite from 44 to 46 ft. 1 bags Nearest Known Source of Contamination _feet direction _type El Well disinfected upon completion? C� Yes No Pump Not Installed Date Installed Manufacturer's name Model number_ HP_ Volts Length of drop Pipe _ft. Capacity_g.p.m Type Material Abandoned Wells Does property have any not in use and not sealed well(s)? 0 Yes No Variance Was a variance granted from the MDH for this well? 0 Yes 0 No Well Contractor Certification First Bedrock Thein Well Co. 34625 HERRBOLDT, N. Aquifer Last Strat Depth to Bedrock ft. License Business Name Lic. Or Reg. No. Name of Driller County Well Index Online Report 635499 Printed 10/26/2009 HE- 01205 -07 1 of 1 10/26/2009 2:14 PM Well Log Report 769482 http: /mdh -agua. health. state .mn.us /cwi /well_log.asp ?wellid= 0000769482 Minnesota Unique Well No. MINNESOTA DEPARTMENT OF HEALTH County Dakota VVELL AND BORING Entry Date 06/23/2009 769482 Quad RECORD Update Date 06/23/2009 Quad ID Received Date Minnesota Statutes Chapter 1031 Well Name UNIVERSITYOF MN PW -C2 -202 Well Depth Depth Completed Date Well Completed Township Range Dir Section Subsections Elevation ft. 147 ft. 145 ft. 01/27/2009 115 19 W 33 DDD Elevation Method Drilling Method Non specified Rotary Well Address Drilling Fluid 160TH ST &STATION TRL Well Hydrofractured Yes CI No ROSEMOUNT MN Bentonite From R. to Ft. Use Test well Geological Material Color Hardness From To CLAY BROWN MEDIUM 0 4 Casing Type Steel (black or low carbon) Joint Unknown Drive Shoe? Yes SND GVL RCK BROWN SOFT 4 145 CLAY GRAY MEDIUM 145 147 No Above/Below ft. LIMESTONE TAN HARD 147 147 Casing Diameter Weight Hole Diameter 6 in. to 125 ft. 18.97 lbs. /ft. 10 in. to 145 ft. Open Hole from ft. to ft. Screen YES Make JOHNSON Type stainless steel Diameter Slot/Gauze Length Set Between 6 30 20 125 ft. and 145 ft. Static Water Level 67 ft. from Land surface Date Measured 01/27/2009 PUMPING LEVEL (below land surface) 88.9 ft. after 9.5 hrs. pumping 250 g.p.m. Well Head Completion Pitless adapter manufacturer Model Casing Protection 21 12 in. above grade At -grade (Environmental Wells and Borings ONLY) REMARKS PW -C2 -202 DRILLED NEAR MW -C2 -202 Grouting Information Well Grouted? El Yes No Grout Material: Bentonite from to 115 ft. 12 bags Nearest Known Source of Contamination feet _direction _type rr Well disinfected upon completion? El Yes CI No Pump 0 Not Installed Date Installed Manufacturer's name Model number_ HP_ Volts Length of drop Pipe 2. Capacity g.p.m Type Material Abandoned Wells Does property have any not in use and not sealed well(s)? Yes No Variance Was a variance granted from the MOH for this well? 0 Yes No Well Contractor Certification First Bedrock Aquifer Mark J Traut Wells. Inc. 1404 STORKAMP.P. Last Strat Depth to Bedrock ft. License Business Name Lic. Or Reg. No. Name of Driller County Well Index Online Report 769482 Printed 10/26/2009 HE- 01205 -07 1 of 1 10/26/2009 2:17 PM Well Log Report 769483 http: /mdh -agua. health. state .mn.us /cwi /wel1_log.asp ?wellid= 0000769483 Minnesota Unique Well No. MINNESOTA DEPARTMENT OF HEALTH 769483 County Dakota Entry Date 06/23/2009 WELL AND BORING Quad Update Date 06/23/2009 Quad ID RECORD Received Date Minnesota Statutes Chapter 1031 Well Name UNIVERSITYOF MN MW -E2 -209 Well Depth Depth Completed Date Well Completed Township Range DirSection Subsections Elevation ft. 126 ft. 126 ft. 01/27/2009 114 19 W 4 DBB Elevation Method Drilling Method Other Well Address STATION TRL &160TH ST W Drilling Fluid Well Hydrofractured? 0 Yes 0 No MN Water From Ft. to Ft. Use Monitor well Geological Material Color Hardness From To TOPSOIL BLACK MEDIUM 0 1 Casing Type Steel(blackorlowcarbon) Joint Threaded Drive Shoe? 0 Yes SILTY SAND BROWN MEDIUM 1 5 SAND GRAVEL BROWN MEDIUM 5 40 No Above/Below ft. SAND BROWN MEDIUM 40 100 Casing Diameter Weight Hole Diameter ROCK BLACK HARD 100 110 SILTY SAND CLAY GRAY MEDIUM 110 116 2 in. to 116 ft. 3.65 lbs. /ft. 7 in. to 126 ft. GRAVEL BROWN MEDIUM 116 119 SILTY CLAY BROWN MEDIUM 119 121 GRAVEL BROWN MEDIUM 121 122 I Open Hole from ft. to ft. SANDSTONE GRAY MEDIUM 122 126 Screen YES Make JOHNSON Type stainless steel Diameter Slot/Gauze Length Set Between 2 10 10 116 ft. and 126 ft. Static Water Level 60 ft. from Land surface Date Measured 01/27/2009 PUMPING LEVEL (below land surface) ft. after hrs. pumping g.p.m. Well Head Completion Pitless adapter manufacturer Model 1 Casing Protection Y 12 M. above grade Ell At -grade (Environmental Wells and Borings ONLY) N REMARKS Grouting lnformation Well Grouted? 0 Yes 0 No Grout Material: Bentonite from to 113 ft. 11 bags Nearest Known Source of Contamination _feet direction _type Well disinfected upon completion? 0 Yes 0 No Pump 0 Not Installed Date Installed Manufacturer's name Model number_ HP_ Volts Length of drop Pipe_ft. Capacity_g.p.m Type Material Abandoned Wells Does property have any not in use and not sealed well(s)? 0 Yes 0 No Variance Was a variance granted from the MDH for this well? 0 Yes 0 No Well Contractor Certification First Bedrock Aquifer Mark J T raut Wells, Inc. 1404 ANDERSON M. Last Strat Depth to Bedrock ft. License Business Name Lic. Or Reg. No. Name of Driller County Well Index Online Report 769483 Printed 10/26/2009 HE- 01205 -07 1 of 1 10/26/2009 2:16 PM Well Log Report 769488 http: /mdh -agua. health. state .mn.us /cwi /well_log.asp ?wel1id- 0000769488 Minnesota Unique Well No. MINNESOTA DEPARTMENT OF HEALTH County Dakota WELL AND BORING Entry Date 06/23/2009 769488 Quad RECORD Update Date 06/23/2009 Quad ID Received Date Minnesota Statutes Chapter 1031 Well Name UNIVERSITYOF MN MW E2 009 Well Depth Depth Completed Date Well Completed Township Range Dir Section Subsections Elevation ft 70 ft. 67.7 ft. 12/21/2008 114 19 W 4 DBB Elevation Method Drilling Method Other Well Address STATION TRAIL &160TH Drilling Fluid Well Hydrofractured? 0 Yes Ll No ROSEMOUNT MN Water From Ft. to Ft. Use Monitor well Geological Material Color Hardness From To TOP SOIL BLACK MEDIUM 0 1 Casing Type Steel (black or low carbon) Joint Threaded Drive Shoe? Yes SILTY SAND BROWN MEDIUM 1 5 r SAND GRAVEL BROWN MEDIUM 5 40 No AbovelBelow ft. SAND BROWN MEDIUM 40 70 Casing Diameter Weight Hole Diameter 2 in. to 57.7 ft. 3.65 lbs. /ft. 7 in. to 70 ft. 1 Open Hole from ft. to ft. Screen YES Make JOHNSON Type stainless steel Diameter Slot/Gauze Length Set Between 2 10 10 57.7 ft. and 67.7 ft. Static Water Level 57 ft. from Land surface Date Measured 12/21/2008 PUMPING LEVEL (below land surface) ft. after hrs. pumping g.p.m. Well Head Completion Pitless adapter manufacturer Model E -j Casing Protection Y 12 in. above grade 171 At -grade (Environmental Wells and Borings ONLY) REMARKS MW -E2 -009 Grouting Information Well Grouted? Yes Eel No Grout Material: Bentonite from to 58.7 ft. 6 bags Nearest Known Source of Contamination _feet _direction _type Well disinfected upon completion? Q Yes fl No Pump Not Installed Date Installed Manufacturer's name Model number_ HP_ Volts Length of drop Pipe 2. Capacity_g.p.m Type Material Abandoned Wells Does property have any not in use and not sealed well(s)? Yes No Variance Was a variance granted from the M DH for this well? El Yes a No Well Contractor Certification First Bedrock Aquifer Mark J Traut Wells, Inc. 1404 ANDERSON,M. Last Strat Depth to Bedrock ft. License Business Name Lic. Or Reg. No. Name of Driller County Well Index Online Report 769488 Printed 1 0/26/2009 HE- 01205 -07 1 of 1 10/26/2009 2:16 PM Well Log Report 769489 http: /mdh -agua. health. state .mn.us /cwi /well_log.asp ?weilid= 0000769489 Minnesota Unique Well No. MINNESOTA DEPARTMENT OF HEALTH County Dakota Entry Date 06/23/2009 769489 Quad WELL AND BORING Update Date 06/23/2009 Quad ID RECORD Received Date Minnesota Statutes Chapter 1031 Well Name UNIVERSITYOF MN MW -C2 -202 Well Depth Depth Completed Date Well Completed Township Range Dir Section Subsections Elevation ft. 147 ft. 147 ft. 01/22/2009 115 19 W 33 DDD Elevation Method Drilling Method Non specified Rotary Well Address Drilling Fluid 160TH ST &STATION TRL Well H ydrofractured Yes ri No ROSEMOUNT MN Bentonite From Ft. to Ft. Use Monitor well Geological Material Color Hardness From To CLAY BROWN MEDIUM 0 4 Casing Type Steel(blackorlowcarbon) Joint Threaded Drive Shoe? Yes SAND GRVL ROCKS BROWN SOFT 4 147 r. LIMESTONE TAN HARD 147 147 No Above/Below ft. Casing Diameter Weight Hole Diameter 2 in. to 137 ft. 3.65 lbs. /ft. 6 in. to 147 ft. Open Hole from ft. to ft. Screen YES Make JOHNSON Type stainless steel Diameter Slot/Gauze Length Set Between 2 10 10 137 ft. and 147 ft. Static Water Level 67 ft. from Land surface Date Measured 01/22/2009 PUMPING LEVEL (below land surface) ft. after hrs. pumping g.p.m. Well Head Completion Pitless adapter manufacturer Model Casing Protection 12 in. above grade At -grade (Environmental Wells and Borings ONLY) N O REMARKS Grouting Information Well Grouted? Yes No Grout Material: Bentonite from to 134 ft. Nearest Known Source of Contamination _feet _direction _type Well disinfected upon completion? O Yes No Pump 0 Not Installed Date Installed Manufacturer's name Model number_ HP_ Volts Length of drop Pipe _ft. Capacity_g.p.m Type Material Abandoned Wells Does property have any not in use and not sealed well(s)? 0 Yes No Variance Was a variance granted from the MDH for this well? 0 Yes No Well Contractor Certification First Bedrock Aquifer Mark J Traut Wells. Inc. 1404 STORKAMP,P. Last Strat Depth to Bedrock ft. License Business Name Lic. Or Reg. No. Name of Driller County Well Index Online Report 769489 Printed 10/26/2009 HE- 01205 -07 1 of 1 10/26/2009 2:15 PM Well Log Report 769490 http: /mdh -agua. health. state .mn.us /cwi /well_log.asp ?wellid= 0000769490 Minnesota Unique Well No. MINNESOTA DEPARTMENT OF HEALTH County Dakota WELL AND BORING Entry Date 06/23/2009 769490 Quad RECORD Update Date 06/23/2009 Quad ID Received Date Minnesota Statutes Chapter 1031 Well Name UNIVERSITYOF MN MW D3 007 Well Depth Depth Completed Date Well Completed Township Range Dir Section Subsections Elevation ft. 70 ft. 70 ft. 01/07/2009 114 19 W 3 BAB Elevation Method Drilling Method Other Well Address AKRON 164TH ST W Drilling Fluid Well Hydrofractured? 0 Yes 0 No ROSEMOUNT MN Water From Ft. to Ft. Use Monitor well Geological Material Color Hardness From To TOP SOIL BLACK MEDIUM 0 1 Casing Type Steel (black or low carbon) Joint Threaded Drive Shoe? Yes SILTY SAND BROWN MEDIUM 1 3 n No Above/Below ft. SAND GRAVEL BROWN MEDIUM 3 70 Casing Diameter Weight Hole Diameter 2 in, to 60 ft. 3.65 lbs. /ft. 7 in. to 70 ft. Open Hole from ft to ft. Screen YES Make JOHNSON Type stainless steel Diameter Slot/Gauze Length Set Between 2 10 10 60 ft. and 70 ft. Static Water Level 58 ft. from Land surface Date Measured 01/07/2009 PUMPING LEVEL (below land surface) ft. after hrs. pumping g.p.m. Well Head Completion Pitless adapter manufacturer Model Casing Protection 0 12 in. above grade C.1 At -grade (Environmental Wells and Borings ONLY) REMARKS MW -D3 -007 Grouting Information Well Grouted? O Yes 0 No Grout Material: Bentonite from to 54 ft. 4 bags Nearest Known Source of Contamination _feet _direction _type Well disinfected upon completion? 0 Yes 0 No Pump 0 Not Installed Date Installed Manufacturer's name Model number_ HP_ Volts Length of drop Pipe _ft. Capacity_g.p.m Type Material Abandoned Wells Does property have any not in use and not sealed well(s)? 0 Yes No Variance Was a variance granted from the M DH for this well? 0 Yes 0 No Well Contractor Certification First Bedrock Aquifer Mark J Traut Wells, Inc. 1404 ANDERSON,M. Last Strat Depth to Bedrock ft. License Business Name Lic. Or Reg. No. Name of Driller County Well Index Online Report 769490 Printed 10/26/2009 HE- 01205 -07 1 of 1 10/26/2009 2:16 PM Well Log Report 769493 http: /mdh -agua. health. state .mn.us /cwi /well_log.asp ?wellid= 0000769493 Minnesota Unique Well No. MINNESOTA DEPARTMENT OF HEALTH County Dakota WELL AND BORING Entry Date 06/23/2009 769493 Quad RECORD Update Date 06/23/2009 Quad ID Received Date Minnesota Statutes Chapter 1031 Well Name UNIVERSITY OF MN MW -C2 -002 Well Depth Depth Completed Date Well Completed Township Range Dir Section Subsections Elevation ft. 75 ft, 75 ft. 01/28/2009 115 19 W 33 DDD Elevation Method Drilling Method Other Well Address STATION TRL &160TH W Drilling Fluid Well Hydrofractured? 0 Yes L7 No ROSEMOUNT MN Water From Ft. to Ft. Use Monitor well Geological Material Color Hardness From To TOPSOIL BLACK MEDIUM 0 2 Casing Type Steel (black or low carbon) Joint Threaded Drive Shoe? Yes SILTY SAND BROWN MEDIUM 2 5 ['3 No Above/Below ft. SAND WITH GRAVEL BROWN MEDIUM 5 75 Casing Diameter Weight Hole Diameter 2 in. to 65 ft. 3.65 lbs. /ft. 7 in. to 75 ft. Open Hole from t to ft. Screen YES Make JOHNSON Type stainless steel Diameter Slot/Gauze Length Set Between 2 10 10 65 ft. and 75 ft. Static Water Level ft. from Date Measured PUMPING LEVEL (below land surface) ft. after hrs. pumping g.p.m. Well Head Completion Pitless adapter manufacturer Model Casing Protection Y CI 12 in. above grade [7 At -grade (Environmental Wells and Borings ONLY) REMARKS MW -C2 -002 Grouting Information Well Grouted? Yes El No Grout Material: Bentonite from to 62 ft. 5 bags Nearest Known Source of Contamination _feet direction _type Well disinfected upon completion? 0 Yes 0 No Pump 0 Not Installed Date Installed Manufacturer's name Model number_ HP_ Volts Length of drop Pipe _ft. Capacity_g.p.m Type Material Abandoned Wells Does property have any not in use and not sealed well(s)? f� Yes No Variance Was a variance granted from the MDH for this well? Yes No Well Contractor Certification First Bedrock Aquifer Mark J Traut Wells, Inc. 1404 ANDERSON M. Last Strat Depth to Bedrock ft. License Business Name Lic. Or Reg. No. Name of Driller County Well Index Online Report 769493 Printed 10/26/2009 HE- 01205 -07 1 of 1 10/26/2009 2:15 PM MINNESOTA MDH DEPARTMENT OF HEALTH Protecting, maintaining and improving the health of all Minnesotans April 2, 2012 Mr. Andrew Brotzler City Engineer City of Rosemount 2875 145 Street West Rosemount, Minnesota 55068 Dear Mr. Brotzler: I am writing this letter to provide the city of Rosemount (the City) with updated guidance documents regarding 1) "Wellhead Protection Issues and Strategies Related to Mining Activities" and 2) "Evaluating Proposed Stormwater Infiltration Projects in Vulnerable Wellhead Protection Areas." These documents have evolved since the Minnesota Department of Health (MDH) last discussed them with the City and we understand you are currently working on an ordinance pertaining to large -scale aggregate mining. MDH has no authority over local zoning or land use decisions and offers these guidance documents to you for reference in your decision process. It is the MDH perspective that the City should consider both the protection of its source water and the protection of the Prairie du Chien- Jordan regional aquifer. It is our understanding that some of the proposed mining activity and a resultant mint pit -lake will be located within a highly vulnerable portion of the City's drinking water supply management area DWSMA), as approved in the amended Part 1 report (March 18, 2011). A rating of high vulnerability indicates that waterborne contaminants could take only weeks to years to reach the aquifer, therefore great care should be taken in this portion of the DWSMA to prevent the release of contaminants during mining activities. The proposed mining activities will remove all of the unconsolidated material above the Prairie du Chien, which is a highly fractured bedrock that is hydraulically connected to the Jordan Aquifer in which the City's wells are completed. The resultant mine pit -lake could be a direct conduit for contamination into the aquifer and is located directly upgradient of City wells Rural Well 1 South (457167) and Rural Well 2 North (474335). We recognize the city's com.mitmcnts to providing sate and clean drinking water to its residents. Please contact me with any questions regarding these MDH guidance documents (651/201- 4658). Sincerely, Joy E. Loughry, Hydrologist Drinking Water Protection Section Environmental Health Division P.O. Box 64975 St. Paul, Minnesota 55164 -0975 JEL:kmc Enclosures General Information: 651 2(11 Toll -free: 888 345 08 2 3 TTY: 65I -2UI 5797 www.health.srare.mn.us Au equal opportunity employer M I N M E S O T A MDH DEPARTMENToF HEALTH Protecting, maintaining and improving the health of al l Minnesotans July 25, 2012 Mr. Andrew Brotzler, P.E. City Engineer City of Rosemount 2875 -145 Street West Rosemount, Minnesota 55608 Dear Mr. Brotzler: Subject: UMore Mining Permit Document Review It is our understanding that the City of Rosemount (the City) is currently reviewing the permit application for the planned UMore aggregate mine. We have reviewed some of the submitted documents and believe that there are deficiencies in the water quality monitoring strategy as proposed in the "Hydrogeologic Study and Water Monitoring Plan." In particular, it does not include provisions for evaluating changes in the water chemistry of the City wells that may result from the direct recharge from surface water into the aquifer. The mining activities as proposed will result in a mine -pit lake that will be hydraulically connected to the bedrock aquifer upgradient of the City wells. A portion of this lake will be located within a highly vulnerable portion of the City's current Drinking Water Supply Management Area (DWSMA). This lake will focus groundwater recharge into the bedrock aquifer that is used by the City and will have the potential to affect the water quality in the aquifer, particularly if the city constructs more water supply wells in this area. The City should be aware that the Minnesota Department of Health (MDH) may have to designate affected city wells as groundwater sources that are under the direct influence of surface water should changes in water quality reflect rapid surface water recharge to the aquifer. If this were to happen, the City may face additional expense in order to meet Federal surface water treatment regulations. The City is currently working on Part 2 of their wellhead protection plan. The proposed mining activities will need to be addressed in the section relating to the impact of land and water use changes. This is also an opportunity to incorporate measures into your plan that will aid in determining the risks to your water supply that this mining activity may pose. Adding specific measures to your plan that relate to characterizing or managing this potential source of contamination will qualify the City to be eligible for MDH Implementation Grant funding to help defray the cost of monitoring. General Information: 651- 201 -5000 Toll -free: 888 -345 -0823 TTY: 651 -201 -5797 www.health.state.mn.us An equal opportunity employer Mr. Andrew Brotzler Page 2 July 25, 2012 We are available to discuss our thoughts on the proposed water quality monitoring plan for UMore Park and the measures that we believe should be incorporated into the Part 2 portion of your wellhead protection plan. Please contact Joy Loughry of my unit at 651/201-4658 for any questions or discussion. We recognize the City's commitment to providing safe and clean drinking water to its residents and look forward to the opportunity to work with you towards that goal. Sincerely, 011 Bruce M. Olsen, Supervisor Source Water Protection Unit Environmental Health Division P.O. Box 64975 St. Paul, Minnesota 55164 -0975 BMO:JEL:kmc cc: Nancy Zeigler, P.E., WSB Associates Karen Voz, MDH Planner, St. Cloud District Office Joy Loughry, MDH Hydrologist, St. Paul Office Page 11 L x MEMORANDUM BG TO: Eric Zweber, City and Rosemount FROM: Dave Hume, LBG CC: Andy Brotzler, City and Rosemount; Nancy Zeigler, WSB DATE: July 28, 2012 LBG Review Comments (2 Review) UMore Large Scale Non Metallic Mineral Extraction Permit RE: Application Dakota Aggregates, LLC City of Rosemount, MN The purpose of this memorandum is to provide the City of Rosemount with Leggette, Brashears Graham, Inc.'s (LBG) comments on the above referenced permit application (AOP). This review includes the initial review comments from LBG's memo dated July 13, 2012, and more recent comments based on discussions with you and Nancy Zeigler in preparation for the July 24 working meeting with the Planning Commission, and comments or questions received at that meeting. These comments are on portions of the permit application that pertain to groundwater and include sections include the following sections: Section 2: Description of Operations (LBG reviewed only sections relevant to groundwater) Section 3: Hydrogeologic Study and Water Monitoring Plan UMore Mining Area Rosemount, MN June 12 2012 Prepared by Barr Engineering Section 4: SPCC Plan Dakota Aggregates Rosemount Facility June 16, 2012 Prepared by: (No comments from LBG at this time) LEGGETTE, BRASHEARS GRAHAM, INC. P age 12 Section 2: Hydrogeologic Study and Water Monitoring Plan 1. No. 53, p. 26, 2nd P: a. "Material will be excavated from the current elevations down to the elevations determined by actual quality, quantity, and depth of aggregate deposit, and..." b. State that the base of mining will be no less than 15 feet above the top of the bedrock surface as noted on Figure 5 in the monitoring plan. 2. No. 53, p. 27, 1st P: a. State how groundwater level will be determined to keep mining 2 feet above the water table. 3. No. 53, p. 27, 3rd P: a. Mineral extraction depths will be based on bedrock surface and keeping a buffer zone of undisturbed material that will not be less than 15 feet thick above bedrock. Therefore, depth of excavation below the water table will vary based on the configuration of the bedrock surface. Section 3: Hydrogeologic Study and Water Monitoring Plan 1. Include page numbers in document. 2. Add the general phasing plan shown on Figure 3 to all relevant figures similar to how it is illustrated on Figures 16 and 17. 3. Section 2.3.2 a. Indicate in text or Table 1 the long -term use or plans for the existing wells that are within the areas to be mined. Examples: long -term monitoring, or continued use until mining schedule requires proper abandonment, etc. 4. Section 2.3.6, 3 P: a. The plan must state that monitoring wells will be installed on the northern and northeastern boundary of the UMA in addition to the ones already proposed immediately downgradient of the lake. The additional wells will to address any concern or potential releases of contaminants in the dry mining areas. Show the locations of the new proposed wells on Figure 17. b. On the basis of the groundwater flow lines shown on Figure 17, the plan must state and show that a monitoring well will be installed in the Jordan aquifer hydraulically downgradient of the area where groundwater particles move downward into this aquifer. c. The last sentence in this paragraph states that wells are proposed along this downgradient edge (which is the northern and northeastern boundary), but no proposed wells along these boundaries are shown on Figure 17. 5. Section 2.3.8 a. The minimum distance between the base of the mine and bedrock is 15 feet based on Figure 5, not "10 to 20 feet" as stated here. LEGGETTE, BRASHEARS GRAHAM, INC. Page 13 b. Estimate the vertical or downward groundwater flow velocity through the 15 feet of outwash (the minimum amount that will remain based on Figure 5) below the bottom of the excavated lake and bedrock surface. 6. Section 3.1 a. Include a new figure or add to an existing figure (Figure 6 might be an appropriate place) the locations and reference name of the test borings in the UMA that penetrated the St. Peter Sandstone and /or Prairie du Chien bedrock and used as control points to contour the bedrock surface. Of particular interest, are the logs located in the area of the mining that will occur below the water table and encountered the Prairie du Chien. b. Provide the boring logs and ground surface elevations for the boring logs used to contour the bedrock surface. The logs do not have to be included in the final monitoring plan. 7. Section 3.4, 2 P: a. In addition to the horizontal flow velocity that is calculated in this section, provide the vertical gradient and estimate the vertical or downward groundwater flow velocity through the outwash, particularly the bottom portion that will remain below the excavated lake and bedrock surface. 8. Section 3.6: a. There are some questions on the modeling that would be most efficiently addressed by having Barr provide the groundwater flow modeling files, or arranging a working meeting that would focus specifically on modeling questions. The latter would be preferred. 9. Section 3.6.1, 2 P, 1 sentence: a. Revise "...from the southwest to the northwest..." to the "northeast..." b. Does Figure 11 represent groundwater flow conditions under the 2050 pumping conditions or more current? c. Is the water makup on -site production well pumping in the current and 2050 scenarios? What about City Wells No. 14 and 15? d. Provide a table or state in text what the pumping rates are for each of the wells in the simulations shown on Figure 11, 12, and 13 and also in the petroleum and pesticide release sceanrios. e. A figure showing the pathlines for 2014 (baseline) conditions in addition to 2050 would be helpful for comparison. f. Use the model results to detemine the flow velocity and travel time through the bottom portion of the lake to the bedrock surface under the 2050 pumping scenario. Assume the thickness of the undisturbed outwash material is 15 feet. 10. Section 3.6.2, 2 P, 2 sentence: a. Revise "stare" to "start". LEGGETTE, BRASHEARS GRAHAM, INC. Page 14 11. Section 3.7: a. Provide a figure in the plan that shows the conceptual hydrogeologic cross section through the downgradient monitoring wells showing the relationship between the screened intervals, water table, and the stratigraphic units (outwash and till). The cross section should be based geologic logs from test borings drilled closest to the proposed wells. The purpose of the cross section is to illustrate the screened intervals will be placed at proper depths with sufficient length to be representative of the groundwater conditions in and across the saturated thickness of the outwash. A second cross section should be created for the line of monitoring wells that are to be proposed along northern and eastern boundary of the UMA and hydraulically downgradient of the dry mining area. (See section 5.1 and Figure 17 comments.) 12. Section 4.1: a. Review and comment in this section on the proposed 2050 DWSMA created. It appears the entire UMA is within the DWSA for the 2050 pumping scenario. Show the 2014 DWSMA in addition the 2050. b. Address MDH April 2, 2012 letter on updated guidance documents regarding WHP strategies related to mining with the larger DWSMA. c. Reference MDH March 18, 2011 approval of 2010 WHP Plan and confirm vulnerability of the proposed 2050 DWSMA. 13. Section 5.1.1: a. This section states the groundwater monitoring system will initially consist of existing wells MW -E2 -209, MW -B1 -001, 208404, and MW- A3 -003, and that these wells will remain part of long -term monitoring program. New wells (RMW -1 through 4) will be installed upon approval of the permit. Text should clarify that the existing and proposed wells will also remain permanently through mining operations. b. Table 1 and Figure 4: Explain the duplicate well labels on Figure 4 for well nos. 207615, 207616, 208402, and 207617. Show monitoring wells with black triangle. c 3 bullet; and, 2 P, 1st sentence: Confirm reference to well no. 208404. d. Table 1: Well no. 208404 is not listed. e. Figure 4: Well no. 208404 is not shown on map. f. Figure 17: Well no. 208405 is shown on map, but not listed in text as a monitoring well. 14. Section 5.1.2.1, 1 P: a. Will existing well MW -B1 -001, and proposed wells RMW -2, and RMW -3 remain as a permanent wells even though they are not located above the till nor above an area to be mined? This paragraph and previous paragraph states these monitoring wells will be part of the long -term groundwater monitoring program, yet they well appear to be in the mining area according to Figure 17. Will these areas not be mined or the wells remain, relocated, or replaced? LEGGETTE, BRASHEARS GRAHAM, INC. Page 15 b. Statement that additional monitoring wells will installed along the northern and northeastern UMA boundary (i.e., downgradient of the dry mining area). c. More explanation should be provided on the depths of the proposed monitoring wells. Example: RMW -3 and RMW -4 are screened in the outwash below the till, and RW -1 and RW -2 are shallower wells where till is absent. Reference the conceptual cross sections showing the screened intervals and stratigraphic relationships. d. A conceptual cross section showing the monitoring well depths and screened intervals relative to the till and bedrock surface would be helpful to illustrate the relationships. Also, the representative model layer that each well will be screened should be shown or listed in Table 2. e. The pathlines for the 2050 pumping scenario show groundwater flowing from the excavated lake to the Jordan Aquifer relatively quickly between MW -B1 -001 and RMW -2. Based on this scenario, a Jordan monitoring well will have to be installed in this area, or outside of the mining area to the northeast before mining begins into the water table in the northeast portion excavated lake area. 15. Section 5.3: a. Include dinitrotoluene (DNT) and other related chemicals associated with gunpowder manufacturing process on sample list because of rail line that extends E -W along northern part of property line (Figure 2). These analyses can be limited to the proposed monitoring wells located hydraulically downgradient of the east -west rail line that crosses the northern portion of the UMA. 16. Section 7.1, 2 P: a. Remove "leachate" from 1 t sentence. b. The EDD deliverables and copies of water level measurements and laboratory reports should be submitted to City when received by Barr. 17. Table 1: a. Well No. 208404 is not listed. b. List the aquifer that each is screened. 18. Table 2: a. Include existing monitoring /observation wells listed in Section 5.5.1 and shown on Figure 17. b. Bedrock elevation at RMW -2 is approximately 825 feet MSL not 860 MSL feet based on the bedrock contour map on Figure 6. 19. Figure 6: a. Show reference name and location of boring used to contour bedrock surface. b. Show extent of St Peter Sandstone in the UMA. LEGGETTE, BRASHEARS GRAHAM, INC. P age 16 20. Figure 11: a. Illustrate model layers on the cross sections to show vertical flow between layers. 21. Figure 12: a. Include model layer no. for each particle trace color (see Figure 17). 22. Figure 13 a. Explain the difference in the groundwater travel times shown on Figure 13 compared to the times shown on the inset map on Figure 14. Figure 13 indicates a travel time of 10 to 20 years to Well Nos. 18 and Figure 14 shows 40 years. Likewise, the travel time from the northern part of the excavated lake to the northeastern corner of UMA on Figure 13 is 0 -5 years and on Figure 14 it is 25 years. 23. Figure 14: a. Include arrows and Xs on the map showing the pathlines for the pesticide release simulation. 24. Figure 17: a. Well no. 208405 is shown on map, but not listed in text as a monitoring well. b. Show locations of the monitoring wells located along the northern and northeastern boundary of the UMA, and the location of the proposed Jordan aquifer monitoring well. C:\Documents and Settings \dave.hume \Local Settings \Temporary Internet Files \Content.Outlook \GH46THSH \UMore GW monitoring plan review (7- 30- 12).docx LEGGETTE, BRASHEARS GRAHAM, INC. C ?1441 C O U N T Y July 30, 2012 Mr. Eric Zweber Senior Planner, City of Rosemount Physical Development Division 2875 145 Street West Lynn Thompson, Director Rosemount, MN 55068 4997 Dakota County Dear Eric, Westem Service Center 14955 Galaxie Avenue Apple Valley, MN 55124 Thank you for the opportunity to review and comment on the June, 2012, Large 952 891 7000 Scale Mineral Extraction Application from Dakota Aggregates to the City of Fax 952 Rosemount, as you requested in your June 28, 2012 letter. Comments from vaww.dakotacountv.us Dakota County Water Resources staff on the following documents are attached: Environmental Mgmt Dept Office of GIS Parks& Open Space UMORE Park Large Scale Non Metallic Mineral Extraction Permit Application, Surveyors Office June 2012; Transit Office "H dro eolo is Study and Water Monitoring Plan UMORE Minin Area Transportation Department Y g g Y g g Water Resources Department prepared by Barr Engineering on behalf of Dakota Aggregates, June 2012; "Environmental Contingency Plan, UMORE Mining Area," prepared by Barr Engineering on behalf of Dakota Aggregates, June 2012; Interim Use Permit Application for Aggregate Processing and Recycled Aggregate Production in the Ancillary Use Facility; and Annual Operating Permit Application for Dry /Wet Mining Sub -Phase 1A, planned to begin in 2013. Please contact Jill Trescott, Water Resources Supervisor (952)- 891 -7019 or jill.trescott @co.dakota.mn.us) or David Swenson, Director, Water Resources Department (952)- 891 -7554 or david.swensonPco.dakota.mn.us), if you have questions or would like to discuss these comments. Sincerely yours, Lynn T" hompson, Director J Physical Development Division Enclosure C: Commissioner Nancy Schouweiler, District 4 Brandt Richardson, County Administrator July 30, 2012 Water Resources Staff Comments: Dakota Aggregates' Mining Permit Application to the City of Rosemount, UMORE Mining Areas (UMA), June 2012 At the request of City of Rosemount staff, Dakota County Water Resources staff have reviewed Dakota Aggregate's June, 2012, application to the City for an interim use permit to conduct Tong -term mining activities in the UMORE Mining Area. The documents include the following: UMORE Park Large Scale Non Metallic Mineral Extraction Permit Application, June 2012; "Hydrogeologic Study and Water Monitoring Plan, UMORE Mining Area," prepared by Barr Engineering on behalf of Dakota Aggregates, June 2012; "Environmental Contingency Plan, UMORE Mining Area," prepared by Barr Engineering on behalf of Dakota Aggregates, June 2012; Interim Use Permit Application for Aggregate Processing and Recycled Aggregate Production in the Ancillary Use Facility; and Annual Operating Permit Application for Dry/Wet Mining Sub -Phase 1A, planned to begin in 2013. For the most part, the comments follow the outline of the Mineral Extraction Permit Application "Extraction Permit with comments on the other documents incorporated where appropriate. These comments are expressed in terms of recommended modifications to the Permit or Plan sections in question. Please contact Jill Trescott, Water Resources Supervisor (952- 891 -7019 or iill.trescott@co.dakota.mn.us) or David Swenson, Director, Water Resources Department (952- 891 -7554 or david.swenson @co.dakota.mn.us), for additional explanation or discussion. As requested by City of Rosemount staff, County staff have provided supplemental comments on the Final Environmental Impact Statement prepared by the University of Minnesota in October, 2010, for the UMA, at the end of this document. UMORE Park Large Scale Non Metallic Mineral Extraction Permit Application "Extraction Permit 6. Introduction and purpose of the proposed excavation The proposed operation will include clearing and grubbing, relocation of surface soils, and stockpiling of topsoil and other overburden. In the course of these operations, "chemical or debris contaminated soil" may be encountered. Such materials, including soil with contaminants below MPCA Soil Reference Values (SRVs), are regulated as "Industrial Waste" under Dakota County Ordinance No. 110. County staff recommend that the Extraction Permit specify that excavated material will be managed in accordance with applicable County Ordinances, as discussed further under #20 Potential Soil Contamination, below. Doing so will avoid improper hauling, relocation, or reuse of contaminated materials in violation of County Ordinances No. 110, Solid Waste Management, or No. 111, Hazardous Waste Management, and applicable State and federal regulations. The long -term effects of the mining that is proposed for below the water table (as deep as 75 feet beneath the static water table, or 145 feet beneath ground surface) on drinking water aquifers, recharge patterns, and groundwater flow to the Vermillion River are difficult to predict. It is unclear, from the Extraction Permit application and from City of Rosemount staff comments, whether the mining in the 1 Dry /Wet Mining phases will be conducted above the water table until the economic material has been removed from all the Dry/Wet Mining phases (Dry/Wet Mining phases 1 -5) before mining below the water table begins, or just Dry/Wet Mining phases 1 and 2. County staff request that the intended phasing be clarified in the Extraction Permit. Because of the long time frame for the proposed mining activities, County staff recommend that the Extraction Permit language provide the City with flexibility to modify the Permit conditions if future information justifies the modifications. With additional time, the City, the University, and the mine operator can collect and evaluate more detailed information regarding the depth to bedrock below the future lake, condition of the bedrock (particularly fractures), local groundwater flow patterns, and impacts from the mining related activities. The size and location of the proposed future lake in relation to the City of Rosemount's Drinking Water Source Management Area has the potential to make the City of Rosemount's water supply "groundwater under the direct influence of surface water," or to impact the City's water supply in other ways. If this happens, the City of Rosemount's future water supply treatment requirements will be significantly more expensive than what is currently needed for its groundwater sources. To support future City decision- making regarding mining activities' impacts to drinking water, comments below on #18 Groundwater Water Monitoring Plan include suggested modifications to the proposed monitoring and modeling activities. 15. Description of the Proposed Fill Activity A. Dry/Wet Mining Phases 1 -5 The discussion of fill appears to describe virgin sand material (clean, fine textured fill) to be used in areas that will be below water. County staff request that where the fine textured fill is to be placed (below water or above) be clarified. In addition, because of the lake's potential to recharge groundwater, County staff recommend that the Extraction Permit specify that only clean fill and topsoil can be used in reclaiming any surface areas that will drain toward the lake. 18. Groundwater Water Monitoring Plan (Hydrogeologic Study and Water Monitoring Plan prepared by Barr Engineering for Dakota Aggregates for the UMORE Mining Area, dated June 2012) County staff recommend that below -water table mining not be permitted until the mining and monitoring plans have been revised to reflect the fracture flow conditions that are likely present in the Prairie du Chien aquifer underlying the site. The current plans do not consider fracture flow; as a result, the actual groundwater flow velocities and directions in the bedrock could be significantly different than indicated by the modeling in the current Hydrogeologic Study. Additional data is needed before the City, the University, and the mine operator will be able to make informed decisions about the appropriate extent of below -water table mining. If additional data and modeling, based on the assumption of fracture flow, indicate that adequate groundwater protection can be provided during mining, then mining deeper and replacing the native gravel deposits with less porous sands, silts, and clays, could provide improved groundwater protection in the post- mining period. If adequate groundwater protection is problematic, then the below -water table mining should be done to a shallower extent than currently proposed. 2 County staff recommend that the Hydrogeologic Study be modified to include 1) additional borings, prior to beginning the below -water table mining phase, in the area of the planned lake to improve understanding of the underlying bedrock elevations; and 2) additional hydrologic testing or observations to evaluate the presence or absence of fracture flow. Hvdrogeologic Study, Section 3.6.2 Predictive Simulations Worst Case Scenario Release Evaluation County staff recommend that the analyses in this section be revised to reflect assumptions of fracture flow in the bedrock aquifers. Figure 12, for example, shows flow pathlines from the lake entering the Prairie du Chien aquifer immediately downgradient from the north end of the lake. In addition, the flow pathline from the lake to hypothetical Well 18 used for these analyses, and illustrated in Figures 14 and 15, does not appear to be fastest or shortest. County staff recommend verifying the model to see if a faster or shorter pathline can be found. Hvdrogeologic Study, Section 5.4 Monitoring Frequency, page 29 County staff recommend that the proposed monitoring frequency be re- evaluated based on 1) using the fastest observed flow rate rather than slowest to determine the monitoring frequency and 2) adding event triggers for additional or more frequent sampling. The method used in the current Hydrogeological Study is based on the goal of ensuring statistical independence of samples. However, the goal of monitoring stated in section 4.0 "is to provide timely detection of a release." County staff recommend that the monitoring frequency be recalculated to address that goal. In addition to revising the monitoring frequency based on flow rates, County staff recommend that event triggers (such as abnormal disturbance of lake -bed materials, excessive stormwater runoff, or potential contaminant releases) should be added to the monitoring plan. County staff also recommend that monitoring frequency and event triggers should increase as the mined depth gets closer to the bedrock. County staff additionally recommend the Hydrogeological Study be modified to include more monitoring wells than currently proposed, immediately adjacent to the downgradient side of the lake, because the number of bedrock wells in that direction does not appear sufficient to characterize changes in flow patterns or identify releases. 20. Potential Soil Contamination County staff recommend that the Extraction Permit specify that excavated soils and other overburden be managed in accordance with applicable County ordinances. As noted above, County Ordinance No. 110 regulates "chemical and debris contaminated soil" as "Industrial Waste." This includes soil with contaminants detected below SRVs. Because of the land's proposed future uses, residential SRVs apply to the UMA. If portions of the UMA are rezoned for industrial or commercial land use during the development process, then industrial SRVs would apply in those areas. Under County Ordinance No. 110: in general, contaminated soil may remain undisturbed if it meets the appropriate SRVs. For beneficial reuse, the County allows excavated, contaminated soils to be reused within the project area (i.e., within the UMA) if the soils meet appropriate SRVs and there is a protective barrier of clean soil or pavement over the reused soil. A timely property disclosure will be required for each location where contaminated soils are relocated. If contaminated soils are to be moved 3 once —for example, placed within a berm and then relocated again years in the future, separate property disclosures will be required for each relocation. In areas for which a property disclosure has been filed, if the contaminated soils are subsequently removed or remediated, an amended property disclosure may be filed, clearing the site. If soil exceeds SRVs, it should be removed from the site for legal disposal. If soil is imported to the site, it must be clean. 21. Environmental Contingency Plan (ECP prepared by Barr Engineering for Dakota Aggregates for the UMORE Mining Area, dated June 2012) The phase -by- phase, pre development inspection proposed in the ECP will be critical in ensuring that environmental problems from the past are investigated and appropriately remediated before each phase of activity proceeds. County staffs opinion is that some of these areas have been preliminarily evaluated, but have not been conclusively delineated. Environmental Contingency Plan: Asbestos Asbestos containing materials (ACM) in the soils are a particular concern for all of UMORE Park. The proposed pre development inspection by a licensed asbestos inspector and the annual worker training, described in the ECP, will be important in protecting worker safety and in remediating the UMA for post mining development. County staff recommend that the ECP specify that, on a phase -by -phase basis, the "footprints" of any GOW -era structures be identified and the soils in those areas sampled and analyzed for the presence of asbestos fibers, prior to site disturbing activities. Environmental Contingency Plan: Unsealed Wells County staff recommend that the ECP specify that the annual worker training include how to identify unsealed wells, so workers will respond appropriately if buried, unsealed wells are uncovered in the course of excavation. Environmental Contingency Plan: Arsenic Arsenic in shallow soils could also be of concern for UMORE Park. Sampling results from the recent UMORE East environmental investigation support the theory that arsenic -based herbicides were sprayed on the ground around many structures during the GOW era. In the September 23, 2010, letter from the University of Minnesota to Dakota County, responding to the County's comments on the draft EIS conducted for the UMA, Dr. Muscoplat indicated that complete "step -out" soil sampling would be conducted in the UMA in locations where arsenic above 9 mg /Kg was detected. County staff recommend that the ECP specify that, on a phase -by -phase basis, the "footprints" of any GOW -era structures be identified and soils in the perimeter around the former structure be sampled for arsenic at shallow depths, to be followed by "step -out" sampling in areas where arsenic above 9 mg /Kg is detected. Environmental Contingency Plan: Specific Areas of County Concern The pre development inspection, worker training, and the identification of the contingency items listed in the ECP will be extremely helpful in identifying other potential problems once excavation begins. However, some contaminants may not be readily identifiable. Contaminants of concern may be present 4 at levels high enough to pose a risk to human health and ecologic receptors but not be detectable by sight or smell. In areas that have been contaminated by past practices, the County's enforcement authority under Ordinance No. 110 generally comes into effect once the old wastes including contaminated soils have been disturbed and /or relocated. County staff have described specific areas in their supplemental comments regarding the EIS, at the end of this document. Environmental Contingency Plan: Comments on Specific Components 2.3 Identification of Contingency Items County staff recommend that "apparent fill soils" be added to the conditions or observations that may trigger a more complete assessment of an area, because of the possibility that the fill included materials that were contaminated elsewhere and relocated. 2.4 Contingency Process Item #7, Communication of Findings: the ECP should specify that the County must be contacted prior to the completion of a full assessment, in accordance with County Ordinance No. 110, Section 14.00. 2.5.1 Non hazardous Materials The ECP should specify that if non hazardous contaminated materials are encountered during excavation, County staff will be notified and the assessment and intermediate and final disposal of waste will be conducted in accordance with County Ordinance No. 110. 2.5.2 Hazardous Materials The ECP should specify that management of hazardous waste will be coordinated with the MPCA and Dakota County, and that all assessment and intermediate and final disposal of hazardous waste will be conducted in accordance with federal, state, and County regulations. 22. Response Action Plan The Response Action Plan process is generally appropriate as described. As noted above, any identified releases are subject to regulation under County Ordinance No. 110, and the procedures and requirements specified under County Ordinance No. 110, Section 14.00 should be followed, in addition to those of the MPCA. 23. Location of any and all existing wells and the size and depth thereof County staff recommend that the Extraction Permit specify that former farmsteads will be investigated to locate and have sealed any unsealed wells, as regulated by the Dakota County Delegated Well Program. 30. Stockpiling (Accessory Use) County staff recommend that the Extraction Permit specify that any contaminated materials to be stockpiled will be managed according to #20 Potential Soil Contamination, above. 5 32. Ancillary Use Facility The placement of the AUF in an area of lower aquifer vulnerability than the surrounding areas may be helpful in preventing groundwater contamination, but should not be relied upon. County staff recommend that the Extraction Permit specify the following: Vehicle and equipment maintenance involving petroleum products will be conducted on impermeable surfaces; Areas where pollutants are stored, dispensed, generated or managed will be managed through covered containment including impervious flooring and a weather resistant roof to prevent contact with precipitation. Runoff from the AUF will not be directed in the direction of the future lake. A Dakota County Hazardous Waste facility permit will be obtained and maintained for the generation of waste oils. 32. E Aggregate Processing and Recycled Aggregate Production Products (RAP) County staff recommend that the Extraction Permit specify that the RAP stockpiles be stored on an impermeable surface, and that runoff from this pile be collected and treated prior to discharge offsite, because of the potential presence of asphalt and contaminants including metals, PAHs, and DRO /GRO, County staff recommend that the Extraction Permit specify that 1) fines from wash water will be evaluated for contaminants of concern, including SVOCs, PAHs, metals, and total petroleum hydrocarbons; 2) material (fines) exceeding MPCA industrial SRVs must be disposed of at a licensed solid waste facility; and 3) fines with levels of contamination above residential SRVs but below industrial SRVs may be stockpiled on site but not allowed to be removed from the AUF facility (except for disposal at a licensed facility). 35. Appearance, Screening, and Berming County staff recommend that the Extraction Permit specify that any contaminated materials to be used for berm construction be managed according to #20 Potential Soil Contamination, above. 36. Hours of Operation Site security measures are not mentioned in the Extraction Permit. The City may want to consider including such measures, to limit access by unauthorized persons and to prevent illegal disposals. 44. Surface Water Protection Plan The City of Rosemount's current Comprehensive Surface Water Management Plan designates the UMA artificial lake as a receiving basin for stormwater. When the Surface Water Management Plan is next updated, County staff recommend the City not use the UMA artificial lake for infiltration, because of the proposed lake's potential impacts on the City's future drinking water supply, described in #6 Introduction above. 46. Drainage characteristics during extraction, erosion control County staff recommend that best management practices (BMPs) such as permanently vegetated buffers be employed around agricultural plots to prevent agricultural runoff and subsurface leaching from degrading the water quality of the new lake. 6 49. Topsoil County staff recommend that the Extraction Permit specify that topsoil must be managed as described in #20 Potential Soil Contamination, above. 51. Maintenance of Mining Vehicles County staff recommend that the Extraction Permit specify that 1) any vehicle maintenance activities involving petroleum fluids will be conducted on an impermeable surface and that 2) a spill kit with the equipment and supplies necessary to contain and clean up spills of fuels or other contaminants be available on fixed sources of pollutants and on all mobile equipment, diesel generators, and vehicles. 54. Site Reclamation, Rehabilitation, and Restoration County staff recommend that the Extraction Permit specify that 1) soils used for site reclamation must be managed as described in #20 Potential Soil Contamination, above; 2) contaminated materials will not be used in reclamation areas where stormwater drainage will flow into the new lake; and 3) soils imported to the site must be clean. Interim Use Permit Application for Aggregate Processing and Recycled Aggregate Production in the Ancillary Use Facility (AUF) and Annual Operating Permit Application for Dry /Wet Mining Sub -Phase 1A Comments regarding the Extraction Permit are applicable to the Interim Use Permit for Aggregate Processing and Recycled Aggregate Production in the AUF and to the Annual Operating Permit Application for Dry/Wet Mining Sub -Phase 1A. The permit applications appear to indicate that soils or other overburden material will not be evaluated for contamination until the eventual time of re- spreading. County staff recommend that the respective permits specify that soils will be evaluated for contamination before excavation, in order to avoid improper hauling, relocation, or reuse of contaminated materials in violation of County Ordinances No. 110, Solid Waste Management, or No. 111, Hazardous Waste Management, and applicable State and federal regulations. 7 Supplemental Comments on the Final Environmental Impact Statement, University of Minnesota UMORE Park Sand and Gravel Resources, October 2010 In addition to the Dakota Aggregates' mining permit application, City of Rosemount staff requested that County staff provide supplemental comments on the EIS prepared by the University of Minnesota in October, 2010, for the UMA. For the Extraction Permit review, County staff have particularly concentrated on the Ancillary Use Facility (AUF), because during the Environmental Impact Study (EIS) process, the proposed location of the AUF shifted. As a result, County staff comments about the EIS regarding the AUF area were limited. In addition, the AUF is the area in which land- disturbing activities are proposed to begin the soonest. Site of Concern (SOC) 1 in the EIS is no longer included in the UMA. SOCs 3 through 8 are in Empire Township, not within the City of Rosemount. SOC 2 is included in the discussion of the AUF. Ancillary Use Facility (AUF) Site 5616 Salvaged Material Storage Yard and 5288- Reinforced Steel Warehouse (Building 234 -T) Located in the northeast area of the AUF, building 234 -T was constructed for use during construction of the GOW facility. Building was in use from 1942 until 1946 for unspecified uses. The 1945 air photo of the building shows an estimated 3 -acre area of storage of unknown materials surrounding the building; an additional 9 -acre area adjacent to the storage yard is heavily disturbed and indicates unknown material storage, haul roads, stockpiles and areas of apparent excavation /filling. Recommendations: Exploratory excavations are urged for suspect areas visible on the 1945 air photograph, at density consistent with MPCA Sampling Guidance. Further evaluation, including sample collection and analysis, would be triggered by the identification of contingency items described in 2.3 of the ECP. Additional excavations may be necessary to determine the extent and magnitude of suspected disposals /releases. County staff recommend soil sample analysis for RCRA metals, semi volatile organic compounds SVOCs), petroleum hydrocarbons (DRO /GRO), and asbestos where indicated. Site 5612 Lumber Storage Originally covering 20- acres, approximately 10 -acres of the former GOW Lumber Storage facility is located in the northwest corner of the AUF. Operational details of this storage area facility are not available, but it appears from the 1945 aerial photograph of the area that lumber and other unspecified materials were stored in a grid pattern created by crushed limestone roadways. Fire protection lines did not extend to this area of the GOW. This lack of fire fighting infrastructure required the adoption of strict fire prevention strategies including vegetation and weed control. The use of arsenical herbicides is suspected have been used in this area owing to the flammable nature of the stored lumber. Recommendation: Exploratory excavations are urged for suspect areas visible on the 1945 air photograph, at density consistent with MPCA Sampling Guidance (approximately four per acre). No fewer than twenty surface soil samples are recommended, to be collected and analyzed for contaminants of concern including SVOCs (wood preservatives such as creosote and pentachlorophenol), RCRA metals, and asbestos where indicated. 8 Site 5678 -Heavy Gauge Rail Trackage Approximately %2 mile of heavy gauge rail trackage constructed in 1942 for the transportation of raw materials, equipment and finished products crosses the western portion of the AUF. Railroad ties were constructed of creosoted timbers. Arsenic -based herbicides may have been used to control vegetation. In the period air photograph, a loading /unloading and surface storage area is visible east of the intersection of the Heavy Gauge Rail Trackage and present -day County Road 46/48. Unknown materials are visible east of the tracks on a limestone working surface. Previous sampling of the Heavy Rail Trackage has identified elevated concentration of PAHs. Several test trenches were collected from this rail bed during the AUF Preliminary Subsurface investigation but no samples were analyzed from the shallow surface soil where contamination is most likely to be present. Recommendation: Exploratory excavations and sample collection are recommended along the former rail bed. Shallow soil samples are recommended every 100 lineal feet along the rail bed. A minimum of six additional shallow soil samples are recommended from the one -acre transfer /temporary storage surface visible on the 1945 air photograph. County staff recommend soil sample analysis for contaminants of concern including SVOCs, RCRA metals, and asbestos where indicated. 1945 Soil Disturbance Area Southeast Area of the AUF In the 1945 aerial photograph, this 9 -acre area located in the southeast corner of the AUF is heavily disturbed and supports haul roads, stockpiles and areas of apparent excavation and filling. A portion of this disturbance was investigated in the AUF Preliminary Subsurface Investigation and incidental debris, including concrete pier footings, was identified. Recommendations: Exploratory excavations are recommended in suspect areas, visible on the 1945 air photograph, at density consistent with MPCA Sampling Guidance. Further evaluation, including sample collection and analysis, would be triggered by the identification of contingency items described in 2.3 of the ECP. Additional excavations may be necessary to determine the extent and magnitude of suspected disposals /releases. County staff recommend soil sample analysis for contaminants of concern including RCRA metals, SVOCs, petroleum hydrocarbons (DRO /GRO), and asbestos where indicated. Agricultural Experiment Station (AES) Sites County staff recommend that past AES Agricultural Research Sites be investigated for shallow soil contamination from RCRA metals and recalcitrant pesticides. County staff recommend that the past AES Sewage Sludge Application Sites be investigated for shallow soil contamination from RCRA metals, perfluorochemicals, petroleum products, pesticides, and SVOCs. 9 resourceful. naturally. BARR engineering and environmental consultants August 21, 2012 Ms. Joy Loughry Hydrologist Drinking Water Protection Section Minnesota Department of Health P.O. Box 64975 St. Paul, MN 55164 -0975 Re: Response to April 2, 2012 Letter from Minnesota Department of Health on Proposed Mining in Rosemount Dear Ms. Loughry: Dakota Aggregates has been requested by the City of Rosemount to provide you with information clarifying the details, and in response to your April 2, 2012 letter to the City, regarding mining in the Rosemount Drinking Water Supply Management Area (DWSMA). As you know, Dakota Aggregates has proposed an aggregate mine in a portion of the UMore Park property in Rosemount and has applied for a mining permit from the City of Rosemount in compliance with City ordinances. The April 2, 2012 letter transmitted the updated MDH guidance documents related to mining activities and stormwater infiltration in wellhead protection areas and cautioned the City about the concerns of mining in high aquifer vulnerability areas. John Greer from our staff spoke with you on June 14, 2012 to clarify the intent of the letter. The following summarizes our understanding of the MDH position and addresses Department concerns which we understand primarily were that the MDH guidance and the City's wellhead protection plan be followed. Based on the content of the the April 2 letter, it appears that it was written before the MDH had the opportunity to review the proposed mine plan (including the Hydrogeologic Study and Water Monitoring Plan). It should be noted that the MDH guidance was included in developing the mining plan from its early stages, even before the EIS was completed. In addition, wellhead protection issues were one of the central factors used in developing the mine plan. Each of the items discussed in the guidance document is also specifically addressed in Section 4.1 of the Water Monitoring Plan (Attachment A). Therefore, not only is the guidance being followed, it was incorporated directly into the monitoring and operational plans. It was correctly noted in the April 2 letter that some of the area proposed to be part of the aggregate mine is in a portion of the City of Rosemount's DWSMA that has been classified as highly vulnerable to contamination. This is not surprising because sand and gravel mining is typically proposed in areas of high aquifer vulnerability because economically viable sand and gravel resources tend to have relatively high hydraulic conductivity. What is unique about this project is the amount of detailed geologic information that was collected and used to map the physical properties of the material at the site and how that information was used in the context of wellhead protection and MDH guidance. For example, the investigation data found that there are relatively large portions of the site that are located in very low permeability materials that have low aquifer vulnerability. Some site operations were, therefore, specifically located in areas of low Barr Engineering Co. 4700 West 77th Street, Suite 200, Minneapolis, MN 55435 952.832.2600 www.barr.com Ms. Joy Loughry August 21, 2012 Page 2 permeability materials to take advantage of the intrinsically protective nature of such areas in protecting water resources. The low permeability areas were also included in the groundwater study and flow modeling documented that these areas would not allow a contaminant release to reach the aquifer. This is why a low aquifer vulnerability area was specifically selected for placement of all permanent fuel storage and operational activities related to handling of chemicals that might pose a significant threat to groundwater water resources. This area is known as the ancillary use facility or AUF (Attachment B). Incidental and temporary fueling activities are proposed in areas of low to moderate aquifer vulnerability. The selection of these areas means that regardless of the DWSMA boundary, the physical ability of potential contaminants to reach groundwater is limited because it would have to migrate through a thick layer of very low permeability material. Finally, we would like to call your attention to an incorrect statement in the April 2 letter. In the second paragraph of the MDH letter it states that the "the proposed mining activities will remove all of the unconsolidated material above the Prairie du Chien, which is a highly fractured bedrock that is hydraulically connected to the Jordan Aquifer in which the City's wells are completed." As you are now aware, City of Rosemount ordinance requires that at least 15 feet of unconsolidated material will remain in place between the proposed base of the mine and the top of the Prairie du Chien. The vast majority of the mined area will have over 40 feet of separation between the excavation and the Prairie du Chien bedrock (Attachment C). Additional details on the geology and hydrology of the site can be found in the Groundwater Assessment Report and the Predictive Simulations reports available on the UMore Park Sand and Gravel resources page (www.umorepark.umn.edu /planning /sand /index.htm). If you have any questions please do not hesitate to call me at 952 832 2740. Sincerely, Jim Aiken, PG Sr. Hydrogeologist Vice President Cc: Mr. Eric Zweber, City of Rosemount Attachments: A Revised Section 4.1 from the Water Monitoring Plan B Figure 16 from Water Monitoring Plan C Figure 5 from Water Monitoring Plan P: \Mpls \23 MN \19\23191101 Dakota Aggregates UMA Permitti \Communications \MDH \Response to JLoughry 4 -2 -12 FINAL.docx Attachment A Section 4.1 from Water Monitoring Plan and MDH Guidance 4.0 Monitoring Strategy The goal of monitoring at the Site is to provide timely detection of a release so that actions can be taken to prevent impacts to groundwater and protect drinking water supplies. Because a portion of the UMA is located within a Well Head Protection Area (WHPA) and DWSMA, there are special operational and monitoring requirements that will be implemented. Because different types of operations occur in different portions of the site and groundwater flow velocities vary, slightly different monitoring strategies are required for other portions of the UMA as described below. 4.1 Monitoring in the Drinking Water Supply Management Area The WHPA and DWSMA in the vicinity of the UMA are shown on Figure 16. As shown, portions of the UMA are located within the WHPA and DWSMA. For several years, the MDH has identified issues of potential concern regarding mining activities related to aggregate mining within WHPAs. These are identified in a Wellhead Protection Issues Guidance Related to Mining Activities prepared by the Minnesota Department of Health, April 2012. The entire project has been designed following the recommendations included in the MDH guidance document. Each of the recommendations from the MDH and the response to the recommendation is summarized below. 1) Movement of disease organism into the aquifer within the time period they remain viable in groundwater: The United States Environmental Protection Agency (USEPA) states human pathogens may remain viable in groundwater for one to two years. At this time, there will not be onsite treatment of sewage and the Site will not have a source of disease organisms. If a septic system is added, it will only be used by the mining workers and will be contained within the ancillary use facility area. The groundwater excavation is not intended to be used as a process treatment or stormwater pond. Baseline and routine monitoring will include total coliform bacteria to assess background and long term presence of pathogens in the aquifer. The monitoring wells will also be used to determine if potential future City supply wells are under the influence of surface water as a result of the groundwater excavation. 1 P:\Mpls \23 MN \19 \23191101 Dakota Aggregates UMA Permitti \Communications \MDH\Exerpt Of Section 4.1.Docx 2) Contamination related to fuel and fuel breakdown products: Permanent fuel storage tanks will be located within the AUF which is an area of low aquifer vulnerability and is not located within the current DWSMA. Areas of low aquifer vulnerability as defined by MDH mean that the geologic materials do not allow rapid movement of potential contaminants to supply wells. The naturally protective character of the geology applies to the AUF regardless of whether the future DWSMA boundary expands to include the surface area of the AUF under future pumping scenarios. Furthermore, the fuel tanks will be above ground storage tanks that are relatively easy to visually inspect for evidence of leaks and will meet Dakota County and /or Minnesota Pollution Control Agency rules. Additionally, a spill prevention plan with appropriate emergency spill response procedures will be in place for the entire UMA operation including the mine floor and groundwater excavation area. Temporary fuel storage will be in areas of low to moderate aquifer vulnerability. As described in Section 3.6, worst -case modeling results indicate that there is very little risk of off -site impact to groundwater from a diesel fuel or pesticide release within the mine area. Any releases at the Site will be addressed in accordance with MPCA (or MDA for pesticides) rules and guidelines for a Limited Site Investigation and corrective measures will be implemented including additional monitoring and response activities a the site of the spill or release. These guidelines require that the spill or release be reported, and a subsurface investigation be conducted to determine the extent and magnitude of the release. If groundwater impacts are likely at least three wells will be installed in the area of the release. The wells are monitored to determine the presence of a plume and /or to assess the need for additional investigation and corrective measures. Corrective measures are specific to the details and location of a particular spill and will be implemented based on the data collected during investigation of the spill area. 3) Contamination related to storing equipment, wastes, and hazardous materials: No waste materials will be stored or processed in the DWSMA. All wastes generated will be processed in accordance with all applicable state and local requirements. Recycled bituminous materials, if managed in the UMA, will be within the AUF. No land spreading of animal manures, industrial, or municipal sludge will take place within the DWSMA. Small releases related to mobile equipment and generators are possible but will be managed by frequent inspection and surface water and groundwater monitoring will be conducted in the mine areas. 2 P:\Mpls \23 MN \19 \23191101 Dakota Aggregates UMA Permitti \Communications \MDH\Exerpt Of Section 4.1.Docx 4) Operation of a bituminous batch plant: No bituminous batch plant will be operated within the DWSMA. 5) Groundwater withdrawal related to mining operations: No dewatering is proposed for this project. A relatively minor amount of water will be withdrawn for make -up water related to washing and dust control. Appropriation permitting will be subject to MDNR regulations. 6) Wells in mining areas: A number of existing wells within the mining area are screened within the Quaternary deposits above the Jordan and PDC. These existing wells will be sealed in accordance with Dakota County ordinance as mining advances. Monitoring wells will be placed in the outwash upgradient and downgradient of mining areas to detect evidence of a potential release before it can reach the deeper aquifers. The wells will be located so that they will be screened at intervals that are most likely to detect evidence of contaminant migration (Figure 17A)Because vertical gradients are generally downward in the UMA, this means that the primary target of monitoring is the lower portion of the outwash above the PDC bedrock. A hypothetical release to surface water would potentially allow dissolved chemical constituents (e.g. petroleum) to migrate into the outwash aquifer. Because petroleum and pesticides are generally lighter than water, the earliest detection monitoring possible at the Site will be via surface water monitoring in the open water portion of the groundwater excavation. Dissolved constituents in the groundwater excavation that reach the surrounding the glacial aquifer would enter groundwater near the water table. They would then migrate laterally and downward under the influence of vertical gradients as shown in Figure 17B. Because the surface water will be mixed by mining and wind activity a hypothetical release would tend to disperse into the water body prior to entering groundwater. This means that a single surface water location point will be representative of water quality in the groundwater excavation, however, several locations are identified because the surface water monitoring will be conducted closest to the area in which the dredge is operating over time 7) Illegal dumping or other uses of mining areas: 3 P:\Mpls \23 MN \19 \23191101 Dakota Aggregates UMA Permitti \Communications \MDH\Exerpt Of Section 4.1.Docx Access to the mining area will be controlled by berming, locked gates at access points or other appropriate measures to prevent public access and potential use of the area for dumping or disposal. The mining area within the DWSMA will not be used for stockpiling or spreading of animal manure. The active mining area will not be utilized for recreational purposes. 8) Site reclamation: Appropriate Site reclamation plans have been developed that will address how future land use and surface water will be controlled to reduce direct infiltration of contaminants into the aquifer. 4 P:\Mpls\23 MN\19\23191 101 Dakota Aggregates UMA Permitti \Communications \MDH\Exerpt Of Section 4.1.Docx Attachment B Figure 16 from Water Monitoring Plan Showing the Areas of Low Aquifer Vulnerability L" o 0 0 73 LL L S Q 7 Q LL F— c§ O 3 i ca d ca Q RI CU O O c c 2 Z gi W CCQ ca_OQ� N m co Z 0L 2 0L m CD CO 0 LL Q 22 O 06 j o� .E c X .c Y md c c Li u p c o 2 a) Ic7) 41 s a cE ii ZJ m a� m co om c a) cz Qm00000 c/)Q o22ct o o c= .c Z w a, D Q N Li c J T H Q 0 i 1 I p I I RE ZaeM fasfl Pxw VWSMO USULJa;Paloid- eA;f9e�auln�i 1. Vaal. %PUe5 ueP\Pf 9L anOid\ueld6upoliuoW;alert Pue AprlS 6oloa6oipAH \SUoday \sdeW \VWfl IWa+OWD \s M\lpedaiowfl WloflUU -CI 0Z'90 Z10Z'000 SIDOM- �alood 108 Attachment C Figure 5 from the Water Monitoring Plan Showing Depth of Buffer Below Mined Area qb y l 145th St W Z. v a 7 t a E s b €t m 7 c w N c s 1 F3750\ m'�5� 6 b'r`a B v Way t -�s:‘;;414 r.. Jf� .1 1 l F3554 V ir f **...#7. 1 �148Ih 6it��1V •.t rr, I 1 r r!` Brenner Ct A 0 4 j I 1 r J k1 e0' ro 1 1" F3350 t y p I *208400 I 441909\ r 'p1 I t '1SOth`01 W 42 L 7 44 911. 1 101 1 PB -B2 a i •1 ,A 1 ,Mtb g tirk r I i �1V11� \''''"'',;,;i t a ltti'c 1 1 2 i1i f `tr1S'` 1 y' e r 1 yl {7'1 i0 1 1 1 1 1 1 ki: ,1i 'Cy?' A a I 4� 1 v 101»s p E1900 L F t PB -C2 t 506638 4. /MW- C2.202 208405 J1650 2oa�z v 4r* -sly, 3 0th St W 207605 207606. '207607. >s. ire t I" >.,4�,, '6* b t F 4 .1 w r Y4 u 4 r yy e E i. �y 6 e1)4x, m, r: J n:i,l 2 ca �h`=Y ;;Tarn CiB Q UMore Mining Area (UMA) Distance (9) QUMore Park Boundary rw -14.7 -20 O Figure 5 Underwater Mining Area ME 20.1 25 N II Prosource Boring (PDC) 025.1 -3o POST MINING DISTANCE BETWEEN Prosource Boring (STP) 030.1 35 OUTWASH AND PRAIRIE DU CHEIN Barr Well /Boring (PDC) 35.1 -40 0 500 1,000 2,00o Hydrogeologic Study and Water Monitoring Plan 40.1 80 Barr Well /Boring (STP) NI 80.1 120 Feet UMore Mining Area CWI Well (PDC) x '120 Rosemount, MN CWI Well (STP) Note: CWI well location was not confirmed in the field. Well location may not be accurate. BARB Based on boring log, boring appears to have been located on an erosional boundary of the S1. Peter Sandstone LEGGETTE, BRASHEARS GRAHAM, INC. PROFESSIONAL GROUNDWATER AND ENVIRONMENTAL ENGINEERING SERVICES 8 PINE TREE DRIVE SUITE 250 ST. PAUL, MN 55112 (651) 490-1405 FAX (651) 490 -1006 www.Ibgweb.com August 22, 2012 Ms. Joy Loughry Hydrologist Minnesota Department of Health Drinking Water Protection Section Environmental Health Division P.O. Box 64975 St. Paul, MN 55164 -0975 Re: Response to MDH and Dakota County UMore Mining Permit Document Review Comments (Source Water Protection Concerns) City of Rosemount Rosemount, Minnesota Dear Ms. Loughry: This correspondence is to follow up on the August 14, 2012 meeting between the City of Rosemount (City) and Minnesota Department of Health (MDH) staff. The purpose of the meeting was to discuss the MDH's and Dakota County Water Resource's (County) review comments on the June 2012 "Hydrogeologic Study and Water Monitoring Plan" (Monitoring Plan) prepared by Barr Engineering (Barr) for Dakota Aggregates UMore (Site) mining permit application. The City requested a meeting with MDH following receipt and review of the comments. The comments provided by the MDH and the County, and subsequently discussed during the meeting, relate specifically to the groundwater and surface water associated with the proposed mining activities and mine -pit lake that will be created in a portion of the City's Drinking Water Supply Management Area (DWSMA). The meeting was held at the City and the following were in attendance: City Staff Dwight Johnson, City Administrator; Kim Lindquist, Community Development Director; Andy Brotzler, City Engineer; and Eric Zweber, Senior Planner; WSB Associates Nancy Zeigler, Water Supply Engineer; and Pete Willenbring, Stormwater Management Engineer; Leggette, Brashears Graham, Inc. (LBG) Dave Hume, Hydrogeologist; and, MDH Staff Joy Loughry, Hydrogeologist; Ginny Yingling, Hydrogeologist; and Karen Voz, Principal Planner. LOUISIANA MISSOURI ILLINOIS SOUTH DAKOTA FLORIDA OHIO NEW JERSEY PENNSYLVANIA TEXAS MASSACHUSETTS WISCONSIN NEW YORK CONNECTICUT Ms. Joy Loughry 2 August 22, 2012 Two letters from the MDH and a letter from the County were received by the City. The letters are summarized below along with the City's response and our understanding of what was discussed and mutually agreed upon. April 2, 2012 MDH letter MDH Comments: This letter was prepared by Joy Loughry, Hydrogeologist with the MDH Drinking Water Protection Section. The letter emphasizes that mining activities and mine -pit lake will be located in a vulnerable portion of the DWSMA. The MDH included with the letter updated guidance documents regarding: 1) "Wellhead Protection Issues and Strategies Related to Mining Activities and 2) "Evaluating Proposed Stormwater Infiltration Projects in Vulnerable Wellhead Protection Areas." The letter also indicates that some of the proposed mine activities and resultant mine -pit lake will be located in vulnerable areas in portions of the City's DWSMA. City Response: The City has had discussions with the applicant during the permit application review process and has requested that the applicant address the mining activities as they relate to the MDH guidance documents and specifically the DWSMA vulnerability. The applicant's Monitoring Plan will address the specific activities and locations within the DWSMA taking into consideration the different vulnerabilities. The applicant will have a surface water and groundwater monitoring plan that will address concerns for potential impact to the unconsolidated and underlying bedrock aquifers focusing on areas of the DWSMA that are classified as highly vulnerable. The City requests that MDH supplement their letter concerning the fact that the entire area is not highly vulnerable. Barr Engineering has prepared a response letter on behalf of Dakota Aggregates that explains the high, moderate, and low vulnerability areas with the mining proposal, the location of the ancillary use facilities (AUF) over the low vulnerability area, and the use of the MDH guidance on mining activity within wellhead protection areas. As the City is amending Part 2 of the Wellhead Protection (WHP) Plan, City staff will work with MDH to develop strategies that address anticipated mining activities. July 25, 2012 MDH letter MDH Comments: This letter was prepared by Bruce Olson, Supervisor with the MDH Source Water Protection Unit and focuses on the mine -pit lake and the potential for groundwater that supplies the City wells to be designated as a source that is under the direct influence of surface water (GWUDI). The MDH identified deficiencies in the applicant's Monitoring Plan regarding monitoring for changes in groundwater chemistry as a result of the additional recharge into the aquifer from the mine -pit lake. The MDH indicates that the City should be aware that the MDH may have to designate any affected City wells as GWUDI if they meet the criteria for this designation. In addition, MDH staff indicated during the meeting that there may be influences from the mine -pit lake that may change the quality of groundwater that would result in additional treatment for cosmetic and /or aesthetic purposes. Ms. Joy Loughry 3 August 22, 2012 City Response: The City assumes the MDH is referring to the Federal Surface Water Treatment Rule (SWTR) (40 CFR 141) definition for GWUDI, which is: "Any water beneath the surface of the ground with significant occurrence of insects or other macroorganisms, algae, or large- diameter pathogens such as Giardia lamblia or Cryptosporidium, or significant and relatively rapid shifts in water characteristics such as turbidity, temperature, conductivity, or pH which closely correlate to climatological or surface water conditions." In general, GWUDI indicates that the groundwater source for a Public Water Supply System (PWS) receives direct recharge from surface water (i.e., river or lake) and could be considered at risk of contamination from pathogens such as Giardia lamblia. If these pathogens are found in groundwater supplied by the PWS, it may be classified as GWUDI and subject to the requirements of the SWTR rather than the Federal Groundwater Rule (GWR). PWS classified as GWUDI are more likely to have shallow wells located close to a surface water source where the distance and time of travel through the aquifer to the wells are such that the risk of pathogens being detected is high. Studies presented by Nelson (1996) showed the risk related to the microbial organisms is substantially reduced after traveling 200 feet through sand and gravel, and 500 feet in fractured bedrock. High risk conditions are also uncommon in wells greater than 200 feet deep.' The City's closest existing downgradient (Well No. 15) is located approximately 3 miles northeast of the proposed mine -pit lake, and the closest future downgradient well (Well No. 18) included in the Monitoring Plan is located 6,000 feet horizontally and 250 feet vertically from the proposed mine -pit lake. Based on this information, the City feels that GWUDI designation under the SWTR is highly unlikely because of the travel distance to the wells, well depths, and management of stormwater into the mine -pit lake. However, to monitor for this, the Monitoring Plan will include analysis of coliform bacteria, which is a common surrogate for the other pathogens. If this is detected, more involved testing can be completed to confirm the occurrence of other organisms. The City's amended Part 1 WHP Plan was approved by the MDH on March 18, 2010. The capture zones used to develop the WHP Area and DWSMA do not underlie surface waters that are considered hydraulically connected to the aquifers that contribute to the City wells. As a result, a composite or conjunctive delineation that encompasses both the groundwater contribution area and the drainage area of a surface water feature was not required. The City concurs with the MDH that once the mine -pit lake is created, the need for a conjunctive delineation should be re- evaluated. Presentation by Dennis Nelson, PhD, Former Groundwater Coordinator, Drinking Water Program, Oregon Health Division. Determination of Groundwater Under Direct Influence of Surface Water, Observations Regarding Hydraulic Connection, MPAs, and Particle Tracking. Presented at the AWWA, Bellevue, WA, May 3, 1996. 2. Gu Manual for Conducting Sanitary Surveys of Public Water Systems; Surface Water and Ground Water Under the Direct Influence (GWUDI), US Environmental Protection Agency, Office of Water (4607), EPA 815 -R- 99 -016, April 1999. Ms. Joy Loughry 4 August 22, 2012 July 30, 2012 County comments County Comments: The County commented on the Monitoring Plan focusing on the Prairie du Chien aquifer and the uncertainty associated with fractured bedrock and groundwater flow characteristics. The County's most significant comment has to do with revising the Monitoring Plan to reflect fracture flow conditions in the Prairie du Chien aquifer. MDH Response: MDH staff indicated their 2005 "Guidance for Delineating Wellhead Protection Areas in Fractured and Solution Weathered Bedrock in Minnesota" is used to delineate WHP areas for wells in fractured bedrock because of the uncertainly and difficulty in modeling these aquifers. MDH also indicated that additional testing and analysis requested by the County will likely not result in improved knowledge of the fractured bedrock flow patterns. City Response: The City concurs with the MDH that travel times and capture zones for wells that utilize fractured bedrock aquifers are very difficult to determine, and the amount of research that would be required to fully characterize fractures to a point where the uncertainty is minimized is not technically feasible. The City also agrees that numerical models based on flow in porous media cannot be used in most cases to simulate groundwater flow in fractured media. As a result of these issues and the uncertainty associated with fracture flow, the MDH developed the "Guidance for Delineating Wellhead Protection Areas in Fractured and Solution Weathered Bedrock in Minnesota" in 2005. The City has discussed this topic with the applicant and they are in the process of updating the Monitoring Plan with information that will address some of the uncertainty associated with fracture flow. This includes providing boring logs and bedrock control points that were used to define the elevation of the bedrock surface, providing groundwater travel times from the bottom of the mine -pit lake to the top of bedrock. Barr has confirmed that the groundwater modeling results used in the Monitoring Plan to select monitoring well locations is based on the City's projected 2050 annual pumping volume, and the associated capture zones and preliminary 2050 DWSMA were created by following the MDH's fracture flow guidance. The inconsistencies of current and previous travel time simulations that were brought to our attention by the MDH staff during the meeting will be addressed. Summary The City appreciates the review and comments provided by the MDH and County, and will continue to work with you and the applicant during the permit application review process to ensure the drinking water source that supplies the City's wells and other areas are protected from the mining activities and future mine -pit lake. The City looks forward to MDH's response and clarification of the letters and the issues discussed during the August 14, 2012 meeting. Ms. Joy Loughry 5 August 22, 2012 Please call me (651) 558 -9207, Nancy Zeigler of WSB at 763 287 -8316, or Eric Zweber of the City at 651- 322 -2052 if you have any questions regarding this matter. Sincerely, LEGGETTE, BRASHEARS GRAHAM, INC David S. Hume, PG Senior Associate Copy: Andy Brotzler, City Eric Zweber, City Kim Lindquist, City Dwight Johnson, City Nancy Zeigler, WSB Pete Willenbring, WSB Karen Voz, MDH Ginny Yingling, MDH Bruce Olson, MDH Steve Robertson, MDH S: \Tech \WSB UMore Rosemount \Umore GW Monitoring Plan \Letter to MDH (8- 22- 12).docx Dakota Aggregates August 22, 2012 Eric Zweber Senior Planner City of Rosemount Rosemount City Offices 2875 145 St. West Rosemount, MN 55068 RE: Responses to Comments to City and County Dear Mr. Zweber, Please find enclosed Responses to both the City of Rosemount and Dakota County in regards to the UMore Park permit application process in 2012. If you have any questions or concerns, please contact me. Sincerely, Patrick A. Bergin, PE, LEED AP Environmental Manager Dakota Aggregates 651 686 -4221 651 -238 -5333 (cell) 651 -688 -0124 (fax) pbergin @cemstone.com Dakota Aggregates 2025 Centre Pointe Blvd., Suite 300 Mendota Heights, MN 55120 P 651 286 -1313 F 651- 688 -0124 11 Response to City and LBG comments from Memorandum dated Section 2: Hydrogeologic Study and Water Monitoring Plan 1. No. 53, p. 26, 2nd P: a. "Material will be excavated from the current elevations down to the elevations determined by actual quality, quantity, and depth of aggregate deposit, and..." b. State that the base of mining will be no less than 15 feet above the top of the bedrock surface as noted on Figure 5 in the monitoring plan. Response: The recommended text will be inserted in the revised plan. The actual area where there is 15 feet of material between the base of the excavation and the top of bedrock is extremely small. Figure 5 will be revised to more clearly show the extent of area with less than 20 feet of glacial material above bedrock. 2. No. 53, p. 27, 1st P: a. State how groundwater level will be determined to keep mining 2 feet above the water table. Response: An annual GW map based on the annual GW monitoring reports will be used to determine the GW elevations annually. Small test excavations may be used to periodically spot check the water level. These test excavations will be backfilled with native material. 3. No. 53, p. 27, 3rd P: a. Mineral extraction depths will be based on bedrock surface and keeping a buffer zone of undisturbed material that will not be less than 15 feet thick above bedrock. Therefore, depth of excavation below the water table will vary based on the configuration of the bedrock surface. Response: Comment noted. The text will be modified to add this clarification. Section 3: Hydrogeologic Study and Water Monitoring Plan 1. Include page numbers in document. Response: Comment noted. The text will be modified accordingly. 2. Add the general phasing plan shown on Figure 3 to all relevant figures similar to how it is illustrated on Figures 16 and 17. Response: Comment noted. The figures will be modified accordingly. 3. Section 2.3.2 Page 12 a. Indicate in text or Table 1 the long -term use or plans for the existing wells that are within the areas to be mined. Examples: long -term monitoring, or continued use until mining schedule requires proper abandonment, etc. Response: Comment noted. The table will be modified accordingly to reflect the plans for the well and the installation /reinstallation and /or sealing date relative to phasing in the mine area. 4. Section 2.3.6, 3rd P: a. The plan must state that monitoring wells will be installed on the northern and northeastern boundary of the UMA in addition to the ones already proposed immediately downgradient of the lake. The additional wells will to address any concern or potential releases of contaminants in the dry mining areas. Show the locations of the new proposed wells on Figure 17. Response: Figure 17 has been revised. As discussed in our August 10 meeting, the text will be modified to clarify that the purpose of routine monitoring is to monitor those permanent features that have been identified as a monitoring target (e.g. the groundwater excavation). Based on this criteria, contingency monitoring is proposed in the northeast dry mining area instead of routine monitoring. This monitoring will be triggered by release events so that monitoring is focused directly on the area of the spill and in accordance with MPCA or Minnesota Department of Agriculture (MDA) guidance for investigating releases and implementing corrective measures. This approach will be far more effective than routine monitoring for the following reasons: 1. There are no distinct sources of contamination that would direct the optimimum placement of monitoring wells 2. The mining period in the North Dry Mining area is relatively brief and is estimated to occur for 15 years 3. If a spill was to occur in Dry mining, the spill will be reported to the MPCA/MDA as per the SPCC plan and will be cleaned up in the sub surface long before reaching the groundwater table. 4. If there is a spill, it will be cleaned up and addressed in accordance with MPCA rules that require investigation and implementing corrective action for any release over 5 gallons of petroleum. If there is presence of fuel in the soils after clean up, groundwater monitoring wells will be installed immediately downgradient of the release. Similar rules apply under MDA regulations for pesticide releases. 5. Mining is not in the water table in the dry mining area therefore there is a soil buffer to protect the groundwater, and time to install wells. 6. Much of the northern area is underlain by fine grained materials that slow groundwater movement. This is why the area is not proposed for deeper excavation. 7. Groundwater modeling for a spill into groundwater and demonstrated that it would have virtually no impact on off site groundwater supplies. This is based on a model assumptiosn that were extremely conservative to demonstrate that no matter what the magnitude of the spill, it would eventually disperse to steady state at or near the mine boundary. Page 13 8. This means that a more plausible release scenario that includes appropriate response action and source removal would have an even less noticeable impact b. On the basis of the groundwater flow lines shown on Figure 17, the plan must state and show that a monitoring well will be installed in the Jordan aquifer hydraulically downgradient of the area where groundwater particles move downward into this aquifer. Response: As we discussed the placement of a Jordan well would not be consistent with the goal of providing timely (within 4 to 6 years) release detection. As shown on Figure 17, a bedrock well would not detect evidence of a release for many years. Alternatively we agreed on placing an additional monitoring well RMW -6 located in the outwash above the bedrock and closer to the groundwater excavation area to intercept a release more quickly. c. The last sentence in this paragraph states that wells are proposed along this downgradient edge (which is the northern and northeastern boundary), but no proposed wells along these boundaries are shown on Figure 17. Response: This reference was intended to mean the groundwater excavation area, not the mining area. This will be clarified with the discussion of the new well described in the item above. 5. Section 2.3.8 a. The minimum distance between the base of the mine and bedrock is 15 feet based on Figure 5, not "10 to 20 feet" as stated here. Response: Comment noted; the text will be revised accordingly. b. Estimate the vertical or downward groundwater flow velocity through the 15 feet of outwash (the minimum amount that will remain based on Figure 5) below the bottom of the excavated lake and bedrock surface. Response: Discussion of this comment at the August 10, 2012 meeting between City of Rosemount staff, LBG staff, Dakota Aggregates, and Barr Engineering staff identified that the issue of concern is the groundwater travel time from the base of the proposed mine pit lake to the underlying Prairie du Chien Group bedrock beneath the proposed deepest portion of the mine pit lake. The groundwater model used for the contaminant release scenarios presented in the Hydrogeologic Study was used to address this comment. The groundwater model includes projected 2050 well locations and pumping rates previously discussed with City /LBG staff. A groundwater particle was started at the bottom of the lake in the proposed deepest portion of the mine pit lake. The starting location is shown on Figure 12A(new figures will be included as A, B, etc. in the report and included with this letter). Per the discussion at the August 10, 2012 meeting, no low conductance layer (i.e., a layer Page 14 of fine sand and silt that is less permeable than underlying sediments containing coarser sand) was assumed at the bottom of the mine pit lake. The particle flow path from the starting location in the deepest portion of the mine pit lake is shown in plan view on Figure 12B. As shown on Figure 12B, after 50 years (the maximum travel time in the simulation) the particle is still approximately 3500 feet from the proposed Well 18 location. Under the projected 2050 conditions simulated with the model, it would take between 4 and 5 years for water leaving the bottom of the mine pit lake in the deepest portion of the lake to reach the top of the Prairie du Chien Group (the uppermost bedrock). Figure 12C shows the particle flow path in cross section overlain on the groundwater model layering. The assumption that there would be no low conductance layer at the bottom of the mine pit lake is a very conservative assumption. Based on experience with other dredge mining operations, fines (i.e., fine sand and silt) would be expected to be continually washed out of the material removed from the mine pit and settle to the bottom of the mine pit lake. The fines would then form a low conductance layer. The low conductance layer would act to slow the movement of water through the bottom of the lake into the groundwater. Therefore, modeling the flow from the bottom of the mine pit lake into the underlying aquifer without a low conductance layer likely results in the modeled travel time being much shorter than is likely to occur. 6. Section 3.1 a. Include a new figure or add to an existing figure (Figure 6 might be an appropriate place) the locations and reference name of the test borings in the UMA that penetrated the St. Peter Sandstone and/or Prairie du Chien bedrock and used as control points to contour the bedrock surface. Of particular interest, are the logs located in the area of the mining that will occur below the water table and encountered the Prairie du Chien. Response: Comment noted; Figures 5 and 6 will be revised to include the locations of relevant test borings, pilot borings, and water supply well records indicate contact with bedrock. b. Provide the boring logs and ground surface elevations for the boring logs used to contour the bedrock surface. The logs do not have to be included in the final monitoring plan. Response: The bedrock surface contour was modified based on a the County Atlas from MGS. The boring logs have been sent to the City under separate cover. 7. Section 3.4, 2 P: a. In addition to the horizontal flow velocity that is calculated in this section, provide the vertical gradient and estimate the vertical or downward groundwater flow velocity through the outwash, particularly Pun e 1 5 the bottom portion that will remain below the excavated lake and bedrock surface. Response: Please see the response to comment 5 above. 8. Section 3.6: a. There are some questions on the modeling that would be most efficiently addressed by having Barr provide the groundwater flow modeling files, or arranging a working meeting that would focus specifically on modeling questions. The latter would be preferred. Response: Meeting was completed on August 10 2012. 9. Section 3.6.1, 2 P 1 sentence: a. Revise "...from the southwest to the northwest..." to the "northeast..." Response: Comment noted; text will be revised accordingly. b. Does Figure 11 represent groundwater flow conditions under the 2050 pumping conditions or more current? Response: Current conditions c. Is the water makup on -site production well pumping in the current and 2050 scenarios? What about City Wells No. 14 and 15? Response: City Wells 14 and 15 are pumping and included in the 2050 scenario and Well 14 is included in the current conditions scenario.The water makeup and on -site production well were not included in the in the 2050 scenario since mining is assumed to be completed so they would not be needed at that time. Regardless, the effective pumping rates of these wells are so low that their impact on the overall modeled results is negligible. This is because the average annual pumping rates from the production rate is very low (7.6 gpm) particularly relative to the City wells which would typically pump at several hundred gpm. Because the wash process is closed loop, there is only a need for a relatively small amount of make -up water to fill and top off the ciruculation ponds. The make up well will draw water from the open water groundwater excavation so that the net pumping effects are distributed over a large area, making the effect on groundwater resources far less than a pumping well. d. Provide a table or state in text what the pumping rates are for each of the wells in the simulations shown on Figure 11, 12, and 13 and also in the petroleum and pesticide release sceanrios. Response: Figure 11 is based on current (i.e., 2008) pumping rates, Figures 12 and 13 are 2050 pumping rates. The petroleum and pesticide release scenarious are based on the 2050 pumping scenario. The current scenario pumping rates are included in the Groundwater Assessement Report and the 2050 rates for new wells were provided by the Page 16 City. The pumping rates are shown on Table 3 which is attached. The report figures and tables will be revised to reflect the modeled scenarios and pumping rates. e. A figure showing the pathlines for 2014 (baseline) conditions in addition to 2050 would be helpful for comparison. Response: As discussed in our meeting the 2050 pumping is more conservative of the two simulations. Flow paths for 2014 differ in that less water goes under the till and flow is dominanted by the refinery wells to the northeast. f Use the model results to detemine the flow velocity and travel time through the bottom portion of the lake to the bedrock surface under the 2050 pumping scenario. Assume the thickness of the undisturbed outwash material is 15 feet. Response: Please see response to comment number 5 above. 10. Section 3.6.2, 2 P 2 sentence: a. Revise "stare" to "start". Response: Comment noted; text will be revised accordingly 11. Section 3.7: a. Provide a figure in the plan that shows the conceptual hydrogeologic cross section through the downgradient monitoring wells showing the relationship between the screened intervals, water table, and the stratigraphic units (outwash and till). The cross section should be based geologic logs from test borings drilled closest to the proposed wells. The purpose of the cross section is to illustrate the screened intervals will be placed at proper depths with sufficient length to be representative of the groundwater conditions in and across the saturated thickness of the outwash. A second cross section should be created for the line of monitoring wells that are to be proposed along northern and eastern boundary of the UMA and hydraulically downgradient of the dry mining area. (See section 5.1 and Figure 17 comments.) Response: Comment noted; a new Figure 17B has been prepared to show the connection of flow paths and the relative position of the proposed monitoring wells. Text of the report will be revised accordingly 12. Section 4.1: a. Review and comment in this section on the proposed 2050 DWSMA created. It appears the entire UMA is within the DWSA for the 2050 pumping scenario. Show the 2014 DWSMA in addition the 2050. Response: Comment noted; text will be revised accordingly. A revised Figure 16 that shows both the current Rosemount DWSMA and the projected 2050 DWSMA in the vicinity of the UMA is attached. The 2050 DWSMA is the most conservative representation because it includes the maximum pumping from the City water supply wells. Pagel 7 b. Address MDH April 2, 2012 letter on updated guidance documents regarding WHP strategies related to mining with the larger DWSMA. Response: Task completed, text of response letter has been sent to City under separate cover. c. Reference MDH March 18, 2011 approval of 2010 WHP Plan and confirm vulnerability of the proposed 2050 DWSMA. Response: Comment noted; text will be revised accordingly to describe the physical reality of the low vulnerability areas within the DWSMA and point out other examples of activities that are commonly located in the DWSMA (e.g. gas stations) that present potential sources of contamination. 13. Section 5.1.1: a. This section states the groundwater monitoring system will initially consist of existing wells MW-E2 -209, MW -B1 -001, 208404, and MW- A3 -003, and that these wells will remain part of long -term monitoring program. New wells (RMW -1 through 4) will be installed upon approval of the permit. Text should clarify that the existing and proposed wells will also remain permanently through mining operations. Response: The text and tables will be modified to clarify the schedule for each well. b. Table 1 and Figure 4: Explain the duplicate well labels on Figure 4 for well nos. 207615, 207616, 208402, and 207617. Show monitoring wells with black triangle. Response: The well lables and symbols will be corrected on Figure 4 3 bullet; and, 2 P, 1st sentence: Confirm reference to well no. 208404. Response: This reference is correct, but is not shown on Figure 4. It is located near the Beef complex several hundred feet outside of the UMA c. Table 1: Well no. 208404 is not listed. Response: The well is not within or within 300 feet of the UMA. d. Figure 4: Well no. 208404 is not shown on map. Response: See 13 b above. e. Figure 17: Well no. 20840.5 is shown on map, but not listed in text as a monitoring well. Page 1 8 Response: The well lables and symbols will be corrected on Figure 17. 14. Section 5.1.2.1, 1 P: a. Will existing well MW -B1 -001, and proposed wells RMW -2, and RMW -3 remain as a permanent wells even though they are not located above the till nor above an area to be mined? This paragraph and previous paragraph states these monitoring wells will be part of the long- term groundwater monitoring program, yet they well appear to be in the mining area according to Figure 17. Will these areas not be mined or the wells remain, relocated, or replaced? Response: The text and tables wil be clarified regarding the phasing of the wells relative to mining. In general the wells will be located in areas that are not mined if possible. However, all monitoring wells will be installed immediately or no less than two years prior to mining in the wet near the proposed phase. The updated Table 2 describes the anticipated installation date of the proposed monitoring wells. b. Statement that additional monitoring wells will installed along the northern and northeastern UMA boundary (i.e., downgradient of the dry mining area). Response: See 4 above. c. More explanation should be provided on the depths of the proposed monitoring wells. Example: RMW -3 and RMW-4 are screened in the outwash below the till, and RW -1 and RW -2 are shallower wells where till is absent. Reference the conceptual cross sections showing the screened intervals and stratigraphic relationships. Response: Comment noted; figure and text will be revised accordingly d. A conceptual cross section showing the monitoring well depths and screened intervals relative to the till and bedrock surface would be helpful to illustrate the relationships. Also, the representative model layer that each well will be screened should be shown or listed in Table 2. Response: Comment noted; figure and table will be revised accordingly e. The pathlines for the 2050 pumping scenario show groundwater flowing from the excavated lake to the Jordan Aquifer relatively quickly between MW -B1 -001 and RMW -2. Based on this scenario, a Jordan monitoring well will have to be installed in this area, or outside of the mining area to the northeast before mining begins into the water table in the northeast portion excavated lake area. Response: See 4 above. 15. Section 5.3: Page 19 a. Include dinitrotoluene (DNT) and other related chemicals associated with gunpowder manufacturing process on sample list because of rail line that extends E -W along northern part of property line (Figure 2). These analyses can be limited to the proposed monitoring wells located hydraulically downgradient of the east -west rail line that crosses the northern portion of the UMA. Response: DNT will be added to the list of parameters. 16. Section 7.1, 2„d P: a. Remove "leachate" frome sentence. b. The EDD deliverables and copies of water level measurements and laboratory reports should be submitted to City when received by Barr. Response: As discussed we will make the suggested changes to the text. 17. Table 1: a. Well No. 208404 is not listed. b. List the aquifer that each is screened. Response: As discussed we will make the suggested changes to the text amd tables. 18. Table 2: a. Include existing monitoring /observation wells listed in Section 5.5.1 and shown on Figure 17. Response: Corrected as noted. b. Bedrock elevation at RMW-2 is approximately 825 feet MSL not 860 MSL feet based on the bedrock contour map on Figure 6. Response: Corrected as noted. 19. Figure 6: a. Show reference name and location of boring used to contour bedrock surface. Response: As noted, will be modifed. b. Show extent of St Peter Sandstone in the UMA. Response: As discussed, the map will show the extent of bedrock. Figure 11: c. Illustrate model layers on the cross sections to show vertical flow between layers. Page 110 Response: As noted, will be modifed. 20. Figure 12: a. Include model layer no. for each particle trace color (see Figure 17). Response: A revised Figure 12 (renumbered as Figure 12A) showing the model layer number for each particle trace color is attached. 21. Figure 13 a. Explain the difference in the groundwater travel times shown on Figure 13 compared to the times shown on the inset map on Figure 14. Figure 13 indicates a travel time of 10 to 20 years to Well Nos. 18 and Figure 14 shows 40 years. Likewise, the travel time from the northern part of the excavated lake to the northeastern corner of UMA on Figure 13 is 0 -5 years and on Figure 14 it is 25 years. Response: The inset maps on Figures 14 and 15 are labeled incorrectly. The arrows shown on the flow paths in the inset maps are not placed at 5 -year time of travel intervals. Rather the arrows were intended to show flow direction. Revised Figures 14 and 15 with the arrows removed from the inset maps are attached. 22. Figure 14: a. Include arrows and Xs on the map showing the pathlines for the pesticide release simulation. Response: See the response to comment 21 immediately above. 23. Figure 17: a. Well no. 208405 is shown on map, but not listed in text as a monitoring well. b. Show locations of the monitoring wells located along the northern and northeastern boundary of the UMA, and the location of the proposed Jordan aquifer monitoring well. Response: See previous response on these items (4, 13, 17) above. 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Table 3 Modeled Rosemount Municipal Well Pumping Rates UMore Mining Area Dakota County, MN 2050 Modeling Well 2008 2008 Model 2050 Projected Scenarios Unique Capacity Pumpage Pumping Rates Pumpage Pumping Rates Well Number (gpm) (Mgal /yr) (m3 /day) (Mgal /yr) (m /day) RR1 457167 400 21.9 227.0 RR2 474335 400 27.5 285.3 7 112212 1200 171.7 1780.8 242.3 2,512.8 8 509060 1000 87.5 907.5 201.9 2,094.0 9 554248 1600 159.9 1657.9 323.0 3,350.4 12 706804 1300 226.1 2345.2 262.5 2,722.2 14 722623 1200 215.8 2238.7 242.3 2,512.8 15 753663 1200 242.3 2,512.8 16 1000 242.3 2,513.0 17 1000 242.3 2,513.0 18 1000 242.3 2,513.0 19 1000 201.9 2,094.0 20 1000 201.9 2,094.0 21 1000 201.9 2,094.0 22 1000 201.9 2,094.0 23 1000 201.9 2,094.0 24 1000 201.9 2,094.0 Total 910.4 9442.4 3,452.5 35,808.1 a Well capacities are based on the City of Rosemount's projected pumping capacities at future wells (WSB, 2007) Page 1 of 1 \barr.com \projects \Mpls \23 MN \19 \23191101 Dakota Aggregates UMA Permitti \WorkFiles \GW Monitoring Plan \Response to Comments \Model_Pumping_Rates.xlsx Table 4 Analytical Parameters, Methods and Reporting Limits Hydrogeologic Study and Water Monitoring Plan UMore Mining Area Rosemount, Minnesota Method (EPA Method MN MDH Human MPCA unless noted Detection Reporting EPA Health -Based Value DWIGW Parameter CAS Number Matrix otherwise) Limit Limit Test Unit MCLs Guidance Table Summary Table General Chemistry (Braun) Nitrate Nitrite as N N +N Water /Liquid SM 4500 NO3 F 0.015 0.020 mg /L 10 Nitrogen, Total Kjeldahl TKN Water /Liquid EPA 351.2 0.15 0.50 mg /L Nitrogen, Total TN Water /Liquid Calculation 0.50 0.50 mg /L Phosphorus, Total 7723 -14 -0 Water /Liquid 3661 0.0028 0.010 mg/L General Chemistry (Legend) Alkalinity, Bicarbonate as CaCO3 BALKA Water /Liquid SM 2320 B -97 N/A 20 mg/L Chloride 16887-00-6 Water/Liquid_ 9056A 0.0029 0.10 mg/L 250SWDR Nitrate as N NITA Water/Liquid_ 9056A 0.02 0.10 mg/L 10 10 HRLMCL 10 MCL Nitrate Nitrite as N N +N Water/Liquid Calc./9056A 0.03 0.20 mg/L 10 Sulfate 14808 -79 -8 Water/Liquid 9056A 0.024 0.10 mg /L 250 SWDR Solids, Total Dissolved TDS Water/Liquid SM 2540 C -97 N/A 10 mg /L 500 SWDR Microbiology (Pace) Total Coliform I TOOL I Water /Liquid 1 SM 9222 B-97 I N/A I 1 1 CFU 0 (5) 0 (5) Metals Arsenic 7440 -38-2 Water/Liquid 6010B 1.1 10 ug/L 10 10 MCL Calcium 7440 -70-2 Water/Liquid 6010B 30 1000 ug/L Iron 7439 -89-6 Water/Liquid 60108 3.8 50 ug/L 300 SDWR Lead 7439 -92 -1 Water/Liquid 60106 0.42 3.0 ug/L 15 TT(7) NA Magnesium 7439-95-4 Water/Liquid 601013 2.1 1000 ug/L Potassium 7440 -09 -7 Water /Liquid 6010B 1.6 1000 ug /L Sodium 7440 -23 -5 Water /Liquid 6010B 5.3 1000 ug /L Mecury Mercury I 7439 -97 -6 I Water /Liquid I 7470A I 0000037 r 0.00020 f mg /L 1 2 I I 2 MCL Semi volatile 2,4- dinitrotoluene 121 -14 -2 Water /Liquid 8270C I 0.45 I 10 ug /L 0.5 2,6- dinitrotoluene 606 -20 -2 Water /Liquid 8270C 0.53 10 ug /L 0.5 Organochlorine Pesticides (Legend) 4,4 -DDD 72 -54 -8 Water /Liquid 8081A 0.031 0.40 ug /L 1 HRL93 1 HRL93 4,4" -DDE 72 -55-9 Water/Liquid 8081A 0.031 0.40 ug/L 1 HRL93 1 HRL93 4,4" -DDT 50 -29-3 Water/Liquid 8081A 0.031 0.40 ug/L 1 HRL93 1 HRL93 a- Chlordane 5103 -71 -9 Water/Liquid 8081A 0.032 0.40 ug/L Aldrin 309 -00-2 Water/Liquid 8081A 0.033 0.40 ug/L 0.02 HBV97 alpha -BHC 319-84-6 Water/Liquid 8081A 0.028 0.40 ug/L 0.06 HBV97 beta -BHC 319 -85-7 Water/Liquid 8081A 0.031 0.40 ug /L 0.2 HBV97 delta -BHC 319 -86-8 Water/Liquid 8081A 0.030 0.40 ug /L Dieldrin 60 -57 -1 Water /Liquid 8081A 0.031 0.40 ug /L 0.006 HRLO8 (1) 0.006 HRL09 Endosulfan I 959 -98-8 Water /Liquid 8081A 0.032 0.40 ug /L Endosulfan II 33213-85 -9 Water /Liquid 8081A 0.032 0.40 ug /L Endosulfan sulfate 1031 -07 -8 Water/Liquid 8081A 0.031 0,40 ug /L Endrin 72-20-8 Water /Liquid 8081A 0.033 0.40 ug /L 2 2 HBV97 Enddn aldehyde 7421 -93-4 Water /Liquid 8081A 0.040 0,40 ug/L Endrin ketone 53494-70-5 Water /Liquid 8081A 0.031 0.40 ug/L gamma -BHC (Lindane) 58 -89-9 Water /Liquid 8081A 0.029 0.40 ug/L 0.2 0.2 HBV97 gamma Chlordane 5566 -34 -7 Water/Liquid 8081A 0.032 0.40 ug/L 2 2 MCL Heptachlor 76-44-8 Water/Liquid 8081A 0.031 0.40 ug/L 0.4 0.08 HRL93 0.08 HRL93 Heptachlor epoxide 1024 -57 -3 Water /Liquid 8081A 0.031 0.40 ug/L 0.2 0.04 HRL93 0.04 HRL93 Methoxychlor 72 -43-5 Water /Liquid 8081A 0.029 0.40 ug/L 40 40 MCL Toxaphene 8001 -35 -2 Water /Liquid 8081A 0.29 1.0 ug/L 3 0.3 HRL93 0.3 HRL93 Organochlorine Pesticides (Braun) 4,4" -DDD 72 -54 -8 Water /Liquid 80818 0.027 0.25 ug /L 1 HRL93 1 HRL93 4,4" -DDE 72 -55-9 Water /Liquid 808113 0.027 0.25 ug/L 1 HRL93 1 HRL93 4,4' -DDT 50 -29-3 Water /Liquid 8081B 0.030 s 0.25 ug/L 1 HRL93 1 HRL93 a- Chlordane 5103 -71 -9 Water /Liquid 80816 0.027 0.25 ug/L Aldrin 309 -00-2 Water /Liquid 8081B 0.029 0.25 ug/L 0.02 HBV97 alpha -BHC 319-84-6 Water/Liquid 8081B 0.029 0.25 ug/L 0.06 HBV97 beta -BHC 319-85-7 Water /Liquid 80818 0.028 0.25 ug/L 0.2 HBV97 delta -BHC 319 -86 -8 Water/Liquid 8081B 0.024 0.25 ug/L Dieldrin 60 -57 -1 Water/Liquid 8081B 0.027 0.25 ug /L 0.006 HRL08 (1) 0.006 HRLO9 Endosulfan I 959 -98 -8 Water /Liquid 80818 0.027 0.25 ug/L Endosulfan II 33213 -65-9 Water /Liquid 8081B 0.038 0.25 ug/L Endosulfan sulfate 1031 -07 -8 Water /Liquid 8081B 0.029 0.25 ug/L Endrin 72 -20 -8 Water /Liquid 80818 0.027 0.25 ug/L 2 2 HBV97 Endrin aldehyde 7421 -93-4 Water/Liquid 8081B 0.030 0.25 ug/L Endrin ketone 53494 -70-5 Water/Liquid 80816 0.034 0.25 ug/L gamma -BHC (Lindane) 58 -89-9 Water/Liquid 8081B 0.028 0.25 ug/L 0.2 0.2 HBV97 gamma Chlordane 5566 -34 -7 Water/Liquid 8081B 0.027 0.25 ug/L 2 2 MCL Heptachlor 76 -44-8 Water/Liquid 8081B 0.033 0.25 ug/L 0.4 0.08 HRL93 0.08 HRL93 Heptachlor epoxide 1024 -57 -3 Water/Liquid 8081B 0.028 0.25 ug/L 0.2 0.04 HRL93 0.04 HRL93 Methoxychlor 72 -43-5 Water/Liquid 80818 0.022 0.25 ug/L 40 40 MCL Toxaphene 8001-35-2 Water/Liquid 80818 1.0 5.0 ug/L 3 0.3 HRL93 0.3 HRL93 \\bam.com \projects\Mpls\23 MN \19\23191101 Dakota Aggregates UMA Permitti \WorkFiles \GW Monitoring Plan \Response to Comments\Additional Comment Response\Table 4 SAP_Legend 8- 20-12criteria DRAFT.xls 1 of 3 Table 4 Analytical Parameters, Methods and Reporting Limits Hydrogeologic Study and Water Monitoring Plan UMore Mining Area Rosemount, Minnesota Method (E' =A Method MN MDH Human MPCA unless not d Detection Reporting EPA Health -Based Value DW /GW Parameter CAS Number Matrix otherwise Limit Limit Test Unit MCLs Guidance Table Summary Table 'MDA List 1 Pesticides (Braun) EPTC 759 -94-4 Water /Liquid 8270D 0.16 0.50 ug/L 200 HRL93 200 HRL93 Propachlor 1918-16-7 Water/Liquid 8270D 0.21 0.50 ug/L 90 HRL93 90 HRL93 Ethalfluralin 55283-68 -6 Water/Liquid 82700 0.2 0.50 ug/L Deisopropylatrazine 1007 -28-9 Water/Liquid 82700 0.18 0.50 ug/L Trifuralin 1582 -09 -8 Water /Liquid 82700 0.16 0.50 ug/L 5 HBV95 Desethylatrazine 6190-65-4 Water /Liquid 8270D 0.1 0.50 ug/L Phorate 298 -02 -2 Water /Liquid 8270D 0.14 0.50 ug /L 1 HBV95 Prometon 1610 -18-0 Water /Liquid 8270D 0.086 0.50 ug /L 100 HRL93 100 HRL93 Simazine 122 -34-9 Water /Liquid 8270D 0.16 0.50 ug/L 4 4 HRLMCL 4 HRLO9 Atrazine 1912 24 9 Water/Liquid 8270D 0.12 0.50 ug/L 3 (6) 3 HRLMCL 3 MCL Propazine 139 -40-2 Water/Liquid 8270D 0.18 0.50 ug /L 10 HBV95 Terbufos 13071-79-9 Water/Liquid 8270D 0.13 0.50 ug /L 0.2 HBV95 Fonofos 944 -22 -9 Water/Liquid 8270D 0.16 0.50 ug /L 10 HBV95 Triallate 2303 -17 -5 Water /Liquid 8270D 0.13 0.50 ug /L 9 HBV95 Metribuzin 21087-64-9 Water /Liquid 8270D 0.17 0.50 ug /L 10 HBV10 Dimethenamid 87674-68 -8 Water /Liquid 8270D 0.14 0.50 ug/L 40 HBV99 Acetochlor 34256-82 -1 Water/Liquid 8270D 0.12 0.50 ug/L 9 HRLO8 (1) 9 HRLO9 Alachlor 15972-60-8 Water/Liquid 82700 0.083 0.50 ug/L 2 5 HRLO8 (1) 5 HRLO9 Cyanazine 21725-46-2 Water/Liquid 82700 0.17 0.50 ug/L 1 HRLO8 (1) 1 HRLO9 Metolachlor 51218-45-2 Water /Liquid 82700 0.059 0.50 ug/L 300 HRL11 (1) 300 HBV09 Chlorpyrifos 2921 -88-2 Water /Liquid 82700 0.15 0.50 ug/L 20 HBV95 Pendimethalin 40487 -42 -1 Water /Liquid 82700 0.079 0.50 ug /L 90 HBV95 MDA Llst 2 Pesticides (Braun) Dicamba 1918 00 9 Water /Liquid 82700 0.16 i 0.50 ug/L 200 HRL93 200 HRL93 M.P.C.A. 94 -74-6 Water/Liquid 8270D 0.13 0.30 ug/L 3 HRL93 3 HRL93 2,40 94 -75-7 Water/Liquid 8270D 0.22 0.50 ug/L 70 70 HRL93 70 HRL93 Triclopyr 55335 -06 -3 Water/Liquid 82700 0.10 0.50 ug/L 300 HBV99 Pentachlorophenol 87 -86-5 Water/Liquid 8270D 0.18 0.50 ug/L 1 1 HRLMCL 1 MCL 2,4,5 -T.P. 93 -72 -1 Water/Liquid 8270D 0.13 0.50 ug/L 50 50 HRLMCL 50 HRL09 /MCL 2,4,5 -T 93 -76-5 Water/Liquid 8270D 0.069 0.50 ug/L 70 HRL93 70 HRL93 Dinoseb 88 -85-7 Water/Liquid 8270D 0.097 0.50 ug /L 7 7 HBV97 2,4 -D.B. 94 -82-6 Water/Uquid 8270D 0.11 0.50 ug /L 60 HBV95 Bentazon 25057 -89-0 Water/Liquid 8270D 0.12 0.50 ug/L 200 HBV98 Picloram 1918 -02 -1 Water/Liquid 8270D 0.079 0.50 ug /L 500 500 HRL93 500 HRL93 VOCs Water /Liquid 1,1,1,2 Tetrachloroethane 630 Water/Liquid 8260B 0.29 1.0 ug /L 70 HRL93 70 HRL93 1,1,1- Trichloroethane 71 -55-6 Water/Liquid 82608 0.16 1.0 ug/L 200 9000 HRLO8 (1) 9000 HRLO9 1,1,2,2 Tetrachloroethane 79 -34 -5 Water /Liquid 8260B 0.16 1.0 ug /L 2 HRL94 2 HRL93 1,1,2- Trichloroethane 79 -00 -5 Water /Liquid 8260B 0.19 1.0 ug /L 5 3 HRL93 3 HRL93 1,1,2- Trichlorotrifluoroethane 76 -13-1 Water /Liquid 82608 0.25 1.0 ug /L 200000 HRL93 200000 HRL93 1,1- Dichloroethane 75-34-3 Water/Liquid 82606 0.15 1.0 ug /L 100 RAA09 (1) 100 RAA09 1,1- Dichloroethene 75 -35-4 Water/Liquid 82606 0.24 1.0 ug /L 7 200 HRL11 (1) 200 HBV09 1,1- Dichloropropene 563 -58-6 Water/Liquid 82608 0.14 1.0 ug/L 1,2,3- Trichlorobenzene 87-61-6 Water/Liquid 82606 0.35 5.0 ug /L 1,2,3- Trichloropropane 96 -18-4 Water/Liquid 82606 0.22 2.5 ug /L 0.003 HBV10 1,2,4- Trichlorobenzene 120 -82 -1 Water/Liquid 82606 0.30 5.0 ug /L 70 4 HBV11 (1) 70 MCL 1,2,4 Trimethylbenzene 95-63 -6 Water/Liquid 82606 0.072 1.0 ug /L 100 RAA10 100 RAA10 1,2- Dibromo-3- chloropropane 96 -12 -8 Water /Liquid 8260B 0.40 5.0 ug /L 0.2 0.2 MCL 1,2- Dibromoethane (EDB) 106-93-4 Water /Liquid 82608 0.15 2.5 ug /L 0.05 0.004 HRL93 0.004 HRL93 1,2- Dichlorobenzene 95 -50-1 Water /Liquid 8260B 0.12 1.0 ug /L 600 600 HRL93 600 HRL93 1,2 Dichloroethane 107 06 2 Water /Liquid 8260B 0.26 1.0 ug /L 5 gV12 (f) 4 HRL93 1,2- Dichloropropane 78-87-5 Water /Liquid 82606 0.19 1.0 ug /L 5 5 HRL94 5 HRL93 1,3,5 Trimethylbenzene 108 -67-8 Water /Liquid 82606 0.11 1.0 ug /L 100 HRLO8 100 HRLO9 1,3- Dichlorobenzene 541 -73-1 Water/Liquid 82606 0.15 1.0 ug/L 600 LHA 1,3- Dichloropropane 142 -28-9 Water/Liquid 8260B 0.16 1.0 ug /L 1,4- Dichlorobenzene 106 -46-7 Water/Liquid 82606 0.081 1.0 ug /L 75 10 HRL94 10 HRL93 2,2- Dichloropropane 594 -20-7 Water /Liquid 8260B 0.66 5.0 ug /L 2- Butanone 78 -93 -3 Water /Liquid 82606 0.65 20 ug /L 4000 HRL94 4000 HRL93 2- Chlorotoluene 95 -49-8 Water /Liquid 82608 0.081 1.0 ug /L 100 LHA 4- Chlorotoluene 106 -43-4 Water /Liquid 82608 0.11 1.0 ug /L 100 LHA Acetone 67-64 -1 Water /Liquid 8260B 3.8 20 ug /L 4000 HRL11 (1) 4000 HBV10 Ally! chloride 107-05-1 Water /Liquid 826013 051 5.0 ug/L 30 HRL94 30 HRL93 Benzene 71 -43-2 Water /Liquid 8260B 0.071 1.0 ug /L 5 2 HRLO8 (1) 2 HRLO9 Bromobenzene 108 -86-1 Water /Liquid 8260B 0.082 1.0 ug /L Bromochloromethane 74 -97 -5 Water /Liquid 82608 0.20 1.0 ug /L 90 LHA Bromodichloromethane 75 27 4 Water /Liquid 8260B 0.23 1.0 ug /L 80 (2) 6 HRL93 6 HRL93 (4) Bromoform 75 -25-2 Water /Liquid 82606 0.26 5.0 ug /L 80 (2) 40 HRL93 40 HRL93 (4) Bromomethane 74-83-9 Water/Liquid 82608 0.32 5.0 ug/L 10 HRL93 10 HRL93 Carbon tetrachloride 56 -23-5 Water/Liquid 82606 0.15 1.0 ug/L 5 IIIIIIIBV12 (1) 1 HBV10 Chlorobenzene 108-90-7 Water/Liquid 82608 0.20 1.0 ug/L 100 100 HRL93 100 HRL93 Chloroethane 75 -00-3 Water/Liquid 82606 0.27 2.5 ug/L .guru, RAA08 (3) \bam.com \projects \Mpls\23 MN \19\23191101 Dakota Aggregates UMA Pennitti \WorkFiles \GW Monitoring Plan\Response to Comments\Additional Comment Response \Table 4 SAP Legend 8 20- 12criteria DRAFT.xls 2 of 3 Table 4 Analytical Parameters, Methods and Reporting Limits Hydrogeologic Study and Water Monitoring Plan UMore Mining Area Rosemount, Minnesota Method (EPA Method MN MDH Human MPCA unless noted Detection Reporting EPA Health -Based Value DWIGW Parameter CAS Number Matrix otherwise) Limit Limit Test Unit MCLs Guidance Table Summary Table Chloroform 67 -66 -3 Water /Liquid 82606 0.15 1.0 ug /L 80 (2) 30 HRLO8 (1) 30 HRLO9 (4) Chloromethane 74 -87 -3 Water /Liquid 82608 0.24 2.5 ug/L 30 LHA cis -1,2- Dichloroethene 158 -59 -2 Water /Liquid 82608 0.12 1.0 ug/L 70 50 HRLO8 (1) 50 HRLO9 cis -1,3- Dichloropropene 10061 -01 -5 Water/Liquid 8260B 0.18 1.0 ug/L Dibromochloromethane 124-48-1 Water/Liquid 8260B 0.26 2.5 ug/L 80 (2) 10 HRL93 10 HRL93 (4) Dibromomethane 74 -95-3 Water/Liquid 82608 0.24 2.5 ug/L Dichlorodifluoromethane 75 -71 -8 Water /Liquid 82608 0.25 5.0 ug /L 700 HRL11 (1) 700 HBV09 Dichlorofluoromethane 75 -43-4 Water/Liquid 82608 0.21 1.0 ug/L ND RAA09 RAA09 (3) Ethyl ether 60 -29-7 Water/Liquid 8260B 0.27 5.0 ug/L 200 RAA10 (1) 200 RAA10 Ethylbenzene 100-41-4 Water/Liquid 82608 0.28 1.0 ug/L 700 50 HRL11 50 HBV10 Hexachlorobutadiene 87 -68-3 Water/Liquid 8260B 0.42 10 ug /L 1 HRL93 1 HRL93 Isopropylbenzene 98 -82 -8 Water/Liquid 8260B 0.12 1.0 ug/L 300 HRL93 300 HRL93 (2) m,p- Xylene 108 -38-3 Water/Liquid 82606 0.57 2.0 ug /L 106 -42 -3 Methyl isobutyl ketone 108-10-1 Water /Liquid 82608 0.40 5.0 ug /L 300 HRL94 300 HRL93 Methyl tert-butyl ether 1634-04 -4 Water/Liquid 82608 0.16 1.0 ug/L 70 HBV00 Methylene chloride 75 -09-2 Water/Liquid 82608 0.85 5.0 ug/L 5 5 HRLMCL 5 MCL Naphthalene 91 -20 -3 Water /Liquid 8260B 0.30 5.0 ug /L 70 HBV11 (1) 300 HRL93 n- Butylbenzene 104 -51 -8 Water /Liquid 8260B 0.15 2.5 ug/L n- Propylbenzene 103-65-1 Water /Liquid 82608 0.094 1.0 ug/L o- Xylene 95-47-6 Water /Liquid 8280B 0.19 1.0 ug/L p- Isopropyltoluene 99 -87-6 Water /Liquid 8260B 0.14 2.5 ug/L sec Butylbenzene 135-98-8 Water /Liquid 8260B 0.11 1.0 ug/L Styrene 100 -42 -5 Water/Liquid 8260B 0.21 1.0 ug/L 100 100 MCL tert- Butylbenzene 98-06-6 Water /Liquid 8260B 0.091 1.0 ug/L Tetrachloroethene 127 -18 -4 Water /Liquid 82608 0.28 1.0 ug/L 5 5 HRLMCL 5 HRLO9 Tetrahydrofuran 109 -99-9 Water /Liquid 8260B 0.75 20 ug/L 100 HRL Toluene 108-88.3 Water/Liquid 8260B 0.10 1.0 ug/L 1000 200 HRL11 200 HBV09 trans -1,2- Dichloroethene 156-60-5 Water/Liquid 8260B 0.056 1.0 ug/L 100 100 HRL93 trans -1,3- Dichloropropene 10061-02-6 Water /Liquid 82608 0.14 1.0 ug/L Trichloroethene 79 -01-6 Water /Liquid 82608 0.18 1.0 ug/L 5 5 HRLMCL 5 HRLO9 Trichlorofuoromethane 75-69-4 Water /Liquid 82608 0.29 1.0 ug/L 2000 HRL93 2000 HRL93 Vinyl chloride 75 -01-4 Water /Liquid 82606 0.21 1.0 ug /L 2 0.2 HRLO8 (1) 0.2 HRLO9 Diesel Range Organics Diesel Range Organics (C10 -C28) I DRO i Water /Liquid I WI DRO l 20 I 100 I ug /L I I 200 HBV99 (11) Notes: CFU Colony Forming Units EPA MCLs (2) 1998 Final Rule for Disinfectants and Disinfection By- products: The total for trihalomethanes is 0.08 mg/L. (5) No more than 5.0% samples total coliform- positive in a month. (For water systems that collect fewer than 40 routine samples per month, no more than one sample can be total colifonn- positive per month.) Every sample that has total coliform must be analyzed for either fecal coliforms or E. coli if two consecutive TC- positive samples, and one is also positive for E.coli fecal coliforms, system has an acute MCL violation. (6) Under review. (7) Copper action level at 1.3 mg /L, Lead action level at 0.015 mg /L TT Treatment technique. MN MDH Human Health -Based Values Table (1) Value is representative of the lowest exposure duration published in the Minnesota Department of Health Values Guidance Table. DCP Value shown is 1,3- dichloropropene in the MDH criterion, however, the laboratory reports cis and trans isomers individually. XYL Value shown is for the sum of the mixed o,m and p xylene isomers. MPCA DWIGW Summary Table (2) While a HRL was promulgated for this chemical, due to research that has become available since the HRLs were promulgated, the MDH no longer recommends the HRL value. (3) Consult with MDH. (4) THM (Total Halo Methanes) total for all THMs combined can not exceed 80 ug /L. 1998 Final Rule for Disinfectants and Disinfectant By- Products. (11) TPH value is based on pyrene as a surrogate (MDH memo 10/8/99). \\barr.00m projects \Mpls\23 MN \19\23191101 Dakota Aggregates UMA Per itti \WorkFiles\GW Monitoring Plan \Response to Comments\Additional Comment Response \Table 4 SAP_Legend 8- 20-12criteria DRAFT.xls 3 of 3 Table 5 Sample Preservation and Holding Times Hydrogeologic Study and Water Monitoring Plan UMore Mining Area Rosemount, Minnesota Parameter Preservative /Container Type EPA Recommended Volume Holding Time Water Metals HNO to pH <2; 6 months Cool to 6 °C, plastic (250 ml) Mercury 28 days Cool to 6 °C, VOCs HCI to pH <2, glass (set of 3 -40 ml 14 days vials) SVOC Cool to 6 °C, glass (1000 ml) 14 days Total Coliform Cool to 6 °C, sterile (100 ml), sodium 6 hours from collection (membrane filtration) thiosulfate Total Phosphorus (Total Kjeldahl Nitrogen and H to pH <2; 28 days Nitrate Nitrite as N, if Cool to 6 °C, plastic (250 ml) needed) CI, SO 28 days; Chloride, Sulfate, Nitrate Cool to 6 °C, plastic (60 ml) NO NO as N 48 Nitrite as N hours Bicarbonate Alkalinity as Cool to 6 °C, plastic (1000 ml) Bicarb. AIk.= 14 days; CaCO TDS TDS 7 days Cool to 6 °C, HCI to pH <2, glass (1- 7 days to extraction; DRO Silica Gel liter amber) 47 days collection to analysis Pesticides Cool to 6 °C, glass (1- liter) 7 days to extraction; 40 days to analysis \barr.com \projects \Mpls \23 MN \19 \23191101 Dakota Aggregates UMA PermittiAWorkFiles \GW Monitoring Plan \Response to Comments \Additional Comment Response \Table 5.doc 1111 N iaoth sn 41„;,54,114r. L< a 'S i/ 1W r 6 it 8 r t r 'se""' \d^ 1 S' A „,0 d 6t' i F 142 Ave t 1 r Bayhe ....e A- 1F 1 14 ,I E a `b fh I Biscay V'o cc. 4 2 ,,,b. 4s- y{ f,7 r jt.: 4 x a .Y� 'k i �e"ry v ?im 1. y 148th St W 1 '9 i� ttt""" iiiiii I E A o o. s 1, 7'''‘i ti es 1 r(k g 10,111: ,4 t y S 1 x• i r tor( t_ii..,, MW 62 202 ylw/. -7X4WE 20805. 4 ^rte 7e!�*1-.",(74 -ao n. 5_ PDC C2= 208402 w n •m s 1 1 4 s a ...._..,.n,.e.e, I Imaaerv:i/009 A.= Ezlxess (Twin Figure 4 O UMore Mining Area (UMA) 0 UMore Park Boundary WELLS WITHIN 300 FEET OF PERMIT AREA Permit Area 300' Buffer O Hydrogeologic Study and Water Water Monitoring Plan Wells (County Well Index) UMore Mining Area A Existing Well, Monitoring Well Location Rosemount, MN 1,000 500 0 1,000 Feet Dakota Count', Barr, County Ve James Hill n W&I data ts from the Dakota Water Management System(WE.MAN). MN County BARR Index, and from Bart a� -4,,,, a s a o„.-3'•'‘' IC l', x ilia' 9 Q Beech S 1455, St W F3750\ z n H. E ..iyne Miy U F 3550' ��,t 14 .t S! W 1 1, 3' BrennerCt, 1 I X oX d r F3350 *208400 I 7F t: 441909 150th 7.. S t 1 1' I 1 I 1 50th S F 1 ,i'af,.' °0 g tdai PVC* .IJ 4 -i iv, f �.101181 j I PB -B2 I _W6'a_ 1 k +t j \1 I t 1 `1 a f 1 y 1 1 I 1 1 t otAti1 tt1 I 1 1 1 I I k I 1 1 t 6 ti 1 E f,. RQ 1 r 11= r, 1 1 ag„ t' Li MD Z t g PB-C2 �xtr .5066 x n M W-C2 -202 2 08405 t v^t o t t m 20840 ,L�.- 207605 E i. 207606 207607 .4� ifij 1 L/ w 4 9 1. v 7t N o w m 1 S.S -'CI' bi' aeni A Express Q UMore Mining Area (UMA) Distance (fl) QUMore Park Boundary -14.7 -20 O Figure 5 Underwater Mining Area 20.1 25 N Prosource Boring (PDC) =25.1 -3o POST MINING DISTANCE BETWEEN Prosource Boring (STP) 030.1 -35 OUTWASH AND PRAIRIE DU CHEIN Barr Well/Boring (PDC) ®35.1 -40 0 500 1.000 2,00o Hydrogeologic Study and 40.1 80 Water Monitoring Plan Barr Well/Boring (STP) Ng 80.1 120 Feet UMore Mining Area CWI Well (PDC) MI >120 Rosemount, MN CWI Well (STP) Note: CWI well location was not confirmed in the field. well location may not be accurate. BARR Based on boring log, boring appears to have been located on an erosional boundary of the St. Peter Sandstone ar_ 3 'i0 H7asa g20 I< 850 Faso LL m i T F7550 e .�yl` H3450. '7750 J7750• 208400 441909• 8�0 a go aa19n�� j ,,PH-B2 A i r \\\*NN's.....s................:00_, 6 /207615 101119 Isi i I ka EHoo/ 506638v:2 I r ,i' 1. r'; 2034 2084 207606• 20760' FD ,X cbb o0 Ima. -ry'. 0 Aer Is prey UMore Mining Area (UMA) UMore Park Boundary Figure 6 Bedrock Contour A CWI Well (PDC) LOCAL BEDROCK TOPOGRAPHY CWI Well (STP) Hydrogeologic Study and Barr Well /Boring (PDC) Water Monitoring Plan 0 1,500 3,000 UMore Mining Area Barr Well /Boring (STP) I Rosemount, MN Feet Prosource Boring (PDC) Prosource Boring (STP) Note. Data that was determined to be an outlier was removed from the data set. BAR R CWI well location was not confirmed in the field. Well location may not be accurate. Based on boring log, boring appears to have been located on an erosional boundary of the St Peter Sandstone Source. 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'e 2 o I /2 a ny k it. 2 m 7 L 1.0 k 2 0 U Z ƒ in 0 z E\ R n ou m cr§ 5 s 4 1. b§ E\ 1 2$\ CC zz +6 e= Io o/ z 0.2 D 0 Et 7 u c:, S e cc o i CO 0 E Q e 3 Q ZI �4 22 7 i A� a w)� Q. o August 22, 2012 Response to Comments from Dakota County The County comments are reproduced below. Barr's responses are highlighted in yellow and follow after the comments. Dakota Aggregates comments are reproduced in Red Font. Water Resources Staff Comments: Dakota Aggregates' Mining Permit Application to the City of Rosemount, UMORE Mining Areas (UMA), June 2012 At the request of City of Rosemount staff, Dakota County Water Resources staff have reviewed Dakota Aggregate's June, 2012, application to the City for an interim use permit to conduct long -term mining activities in the UMORE Mining Area. The documents include the following: UMORE Park Large Scale Non Metallic Mineral Extraction Permit Application, June 2012; "Hydrogeologic Study and Water Monitoring Plan, UMORE Mining Area," prepared by Barr Engineering on behalf of Dakota Aggregates, June 2012; "Environmental Contingency Plan, UMORE Mining Area," prepared by Barr Engineering on behalf of Dakota Aggregates, June 2012; Interim Use Permit Application for Aggregate Processing and Recycled Aggregate Production in the Ancillary Use Facility; and Annual Operating Permit Application for Dry /Wet Mining Sub -Phase 1A, planned to begin in 2013. For the most part, the comments follow the outline of the Mineral Extraction Permit Application "Extraction Permit with comments on the other documents incorporated where appropriate. These comments are expressed in terms of recommended modifications to the Permit or Plan sections in question. Please contact Jill Trescott, Water Resources Supervisor (952- 891 -7019 or iill.trescott @co.dakota.mn.us) or David Swenson, Director, Water Resources Department (952- 891 -7554 or david.swenson @co.dakota.mn.us), for additional explanation or discussion. As requested by City of Rosemount staff, County staff have provided supplemental comments on the Final Environmental Impact Statement prepared by the University of Minnesota in October, 2010, for the UMA, at the end of this document. UMORE Park Large Scale Non Metallic Mineral Extraction Permit Application "Extraction Permit 6. Introduction and purpose of the proposed excavation The proposed operation will include clearing and grubbing, relocation of surface soils, and stockpiling of topsoil and other overburden. In the course of these operations, "chemical or debris contaminated soil" may be encountered. Such materials, including soil with contaminants below MPCA Soil Reference Values (SRVs), are regulated as "Industrial Waste" under Dakota County Ordinance No. 110. County staff recommend that the Extraction Permit specify that excavated material will be managed in accordance with applicable County Ordinances, as discussed further under #20 Potential Soil Contamination, below. Doing so will avoid improper hauling, relocation, or reuse of contaminated 1 materials in violation of County Ordinances No. 110, Solid Waste Management, or No. 111, Hazardous Waste Management, and applicable State and federal regulations. The long -term effects of the mining that is proposed for below the water table (as deep as 75 feet beneath the static water table, or 145 feet beneath ground surface) on drinking water aquifers, recharge patterns, and groundwater flow to the Vermillion River are difficult to predict. It is unclear, from the Extraction Permit application and from City of Rosemount staff comments, whether the mining in the Dry /Wet Mining phases will be conducted above the water table until the economic material has been removed from all the Dry /Wet Mining phases (Dry/Wet Mining phases 1 -5) before mining below the water table begins, or just Dry /Wet Mining phases 1 and 2. County staff request that the intended phasing be clarified in the Extraction Permit. Item 57 entitled Phasing Standards in the "Extraction Permit" states that Dry/Wet Mining activities will occur in two phases. Initially, Dry /Wet Mining activities will occur from the existing grade to not closer than 2 feet from the water table in phases 1A through 28. Once the overburden material has been relocated, stock piled or utilized for berm construction, mining activities will be initiated by the use of loaders, screens, crushers and conveyors and aggregate material will be transferred to the AUF for material processing. Once it has been determined that mining activities in Dry /Wet Mining Phase 1A have approached the water table but not closer than two feet above the water table, mining activities in 1A will halt and mining will be initiated in Dry /Wet Mining Phase 18. This will be the phasing sequence through Dry /Wet Mining Phase 28. The second stage of the Dry/ Wet mining operation will occur once mining activities have terminated in Dry /Wet Mining Phase 28. A dredge, draglines, backhoes and other equipment capable of extracting material under water will be setup in Dry /Wet Mining sub- phase 1AA and will extract aggregate material below the water table to the approximate contours which are depicted on the End Use Reclamation Plan which will be conveyed to the AUF for material processing. Once the mining has expired in sub- phase 1AA, dredging /mining operations will move sequentially to Dry /Wet Mining sub -phase 188 then to sub- phase 2AA with the final Dry/Wet mining sub -phase 588 estimated to be complete by 2037. In other words the first 4 phases (1A -28) which is approximately 80 acres will be mined above the water table. Once these first four phases are complete 2 feet above the water table, mining will revert back to the completed 1A phase which now that mining will occur in the water will be referred to as 1AA and a dredge will be in place to mine into the water table. All other Dry /Wet mining phases will (other than IA -28) be mined out by use of a dredge in sequential order. Because of the long time frame for the proposed mining activities, County staff recommend that the Extraction Permit language provide the City with flexibility to modify the Permit conditions if future 2 information justifies the modifications. With additional time, the City, the University, and the mine operator can collect and evaluate more detailed information regarding the depth to bedrock below the future lake, condition of the bedrock (particularly fractures), local groundwater flow patterns, and impacts from the mining related activities. The size and location of the proposed future lake in relation to the City of Rosemount's Drinking Water Source Management Area has the potential to make the City of Rosemount's water supply "groundwater under the direct influence of surface water," or to impact the City's water supply in other ways. If this happens, the City of Rosemount's future water supply treatment requirements will be significantly more expensive than what is currently needed for its groundwater sources. The separation distance and depth between the groundwater excavation and the City's potential future wells make surface water influence highly unlikely because it would require biological contaminants (algae, insect parts, etc) to travel long distances through fine pores of sand and rock that essentially filter these materials long before they would reach the water supply wells. Regardless, the lake will be a primary focus of routine monitoring throughout the life of the mine. The monitoring will include baseline sampling for total coliform bacteria as an indicator of ambient biological activity in the aquifer prior to mining. To support future City decision making regarding mining activities' impacts to drinking water, comments below on #18 Groundwater Water Monitoring Plan include suggested modifications to the proposed monitoring and modeling activities. 15. Description of the Proposed Fill Activity A. Dry /Wet Mining Phases 1 -5 The discussion of fill appears to describe virgin sand material (clean, fine textured fill) to be used in areas that will be below water. County staff request that where the fine textured fill is to be placed (below water or above) be clarified. Virgin sand material will be placed around and in the lake. In addition, because of the lake's potential to recharge groundwater, County staff recommend that the Extraction Permit specify that only clean fill and topsoil can be used in reclaiming any surface areas that will drain toward the lake. 18. Groundwater Water Monitoring Plan (Hydrogeologic Study and Water Monitoring Plan prepared by Barr Engineering for Dakota Aggregates for the UMORE Mining Area, dated June 2012) County staff recommend that below -water table mining not be permitted until the mining and monitoring plans have been revised to reflect the fracture flow conditions that are likely present in the Prairie du Chien aquifer underlying the site. The current plans do not consider fracture flow; as a result, the actual groundwater flow velocities and directions in the bedrock could be significantly different than indicated by the modeling in the current Hydrogeologic Study. As a preliminary matter, it is important to note that the Prairie du Chien is not the only unit that groundwater would move through on its way to a hypothetical well. Mixing and dispersion in both the lake itself and the glacial material would significantly diminish the likelihood of contaminants from the lake reaching a supply well. Contaminant transport modeling has indicated that even an unlimited and an infinite source of contamination would be attenuated to a low steady state 3 concentration by the time it moves past the boundary of the mining area. This means the release would be below that is well below applicable drinking water standards while still far away from the potential water supply wells in question. The Prairie du Chien dolostone has very little primary (grain to grain) porosity because it is primarily a cemented carbonate crystalline rock without significant pore space that allow intergranular flow. Fracture permeability is a well recognized characteristic of this aquifer and the permeability of the unit has been adjusted to account for higher groundwater flows in the formation. Fracture flow has been incorporated into the plans and is implicit in the model through calibration. There is no indication from the groundwater data or the observation well data used to calibrate the model that there are explicit fracture features that would require additional investigation or modeling effort. Although explicit fracture flow models do exist, these models are not used unless more straightforward modeling methods fail to match observed conditions. To date, no evidence of such deficiencies was raised during review by the professional practioners of modeling at State agencies and the general public during the EIS. The groundwater model used as a basis for the work at the site is the Metro Model II, state of the art, three dimensional flow model constructed for the Metropolitan Council. This model has been widely used and has been widely accepted as a useful tool for studying groundwater in the region. The calibration methods used for that model are the same as those used for the site except that the site model is much more refined and tuned to the specific groundwater conditions observed at UMore Park. Additional data is needed before the City, the University, and the mine operator will be able to make informed decisions about the appropriate extent of below -water table mining. If additional data and modeling, based on the assumption of fracture flow, indicate that adequate groundwater protection can be provided during mining, then mining deeper and replacing the native gravel deposits with Tess porous sands, silts, and clays, could provide improved groundwater protection in the post- mining period. If adequate groundwater protection is problematic, then the below -water table mining should be done to a shallower extent than currently proposed. Not all of the mine is being excavated below the water table and the majority of the below -water area is relatively shallow. Only those areas that appear to possess adequate aggregate quality are proposed for below -water mining and only a relatively small portion of that area is proposed for deeper excavation. The deeper excavation areas have a minimum buffer requirement, and the modeling performed to demonstrate that the mine is protective of groundwater incorporates allowance for fracture flow. Further, the mining plan already includes replacement of native materials into the excavation. Therefore, it appears that the information has already been incorporated into the plan, and the protective actions suggested above have already become part of the mining plan. Therefore, additional data collection is unnecessary. County staff recommend that the Hydrogeologic Study be modified to include 1) additional borings, prior to beginning the below -water table mining phase, in the area of the planned lake to improve 4 understanding of the underlying bedrock elevations; and 2) additional hydrologic testing or observations to evaluate the presence or absence of fracture flow. As stated above, fracture flow is the presumptive means by which flow in the rock has been characterized. Therefore testing for its absence is unnecessary. Hydrogeologic Study, Section 3.6.2 Predictive Simulations Worst Case Scenario Release Evaluation County staff recommend that the analyses in this section be revised to reflect assumptions of fracture flow in the bedrock aquifers. Figure 12, for example, shows flow pathlines from the lake entering the Prairie du Chien aquifer immediately downgradient from the north end of the lake. In addition, the flow pathline from the lake to hypothetical Well 18 used for these analyses, and illustrated in Figures 14 and 15, does not appear to be fastest or shortest. County staff recommend verifying the model to see if a faster or shorter pathline can be found. First it is important to note that the reason that these pathlines that move downward into the Prairie du Chien is because groundwater flow is blocked and slowed significantly in this area by fine grained, low permeability layers in the glacial deposits. Travel times in this area are up to several decades longer than in other areas of the glacial materials bordering the lake. The selection of pathlines was intended to be representative, given that the nature of a contaminant in the aquifer is a plume rather than a particle. Although it may or may not be the fastest conceivable flow path, the selected path it is among the fastest of the particle paths included in the simulation relative to Well 18. It is important to note that the model was intended to be conservative (worst case scenario), but must also be physically realistic. Adding layers and layers of conservative assumptions is not a useful means of assessing contaminant transport A release in the lake would be mixed and diluted so that it would substantially be decreased before moving into the aquifer. In addition, the source of a release would be from a finite source, such as a storage tank assuming as continuous (e.g. infinite in time source). These factors make the modeled simulation very protective and along with using fast travel time are very conservative assumptions. Hydrogeologic Study, Section 5.4 Monitoring Frequency, page 29 County staff recommend that the proposed monitoring frequency be re- evaluated based on 1) using the fastest observed flow rate rather than slowest to determine the monitoring frequency and 2) adding event triggers for additional or more frequent sampling. The method used in the current Hydrogeological Study is based on the goal of ensuring statistical independence of samples. However, the goal of monitoring stated in section 4.0 "is to provide timely detection of a release." County staff recommend that the monitoring frequency be recalculated to address that goal. The monitoring network has been established based on detecting a potential release prior to reaching the bedrock, which means less than 4 to 6 years which is rapid on the scale of groundwater movement, particularly in glacial materials. According to ASTM D 6312, statistical independence of samples is a requirement for generating valid data for groundwater monitoring. Increasing the sampling frequency would not enhance the ability to detect a release or discern it from background conditions. 5 Assuming no degradation or attenuation, a contaminant plume moving in groundwater would move in a direction that is the sum of the average linear velocity along multiple flow paths. A single flow path model is therefore not a realistic means of assessing contaminant transport or establishing monitoring frequency. In addition to revising the monitoring frequency based on flow rates, County staff recommend that event triggers (such as abnormal disturbance of lake -bed materials, excessive stormwater runoff, or potential contaminant releases) should be added to the monitoring plan. County staff also recommend that monitoring frequency and event triggers should increase as the mined depth gets closer to the bedrock. A potential contaminant release is addressed in the SPCC plan, and would require monitoring on a frequency that is consistent with MDA or MPCA response requirements. The other events (disturbance of lake sediments and excessive stormwater runoff) are difficult to envision in the context of a presumed impact to groundwater quality or rate given that the lake is not intended to be a stormwater pond and the lake bed materials consist of native materials that are already in the aquifer. None of these conditions or the mining itself can significantly change the overall rate of groundwater movement in the aquifer which is the basis of the sampling frequency. County staff additionally recommend the Hydrogeological Study be modified to include more monitoring wells than currently proposed, immediately adjacent to the downgradient side of the lake, because the number of bedrock wells in that direction does not appear sufficient to characterize changes in flow patterns or identify releases. Bedrock wells would not offer timely monitoring because the first evidence of a release would appear in the glacial deposits, not the bedrock. Also, given that a potential release would be dispersed widely in the lake itself before reaching the glacial deposits the concentrations would be detectable over a wide areas and the well does not have be located immediately downgradient of a potential release point to provide early detection. Once in the aquifer, the release would then disperse to a lesser degree but still increase the likelihood that even a single well located near the centerline of the lake could monitor most of the lake area. Therefore if only one well is arguably sufficient to detect a release based on the physical processes involved, then it does not follow that multiple wells are insufficient. 20. Potential Soil Contamination County staff recommend that the Extraction Permit specify that excavated soils and other overburden be managed in accordance with applicable County ordinances. As noted above, County Ordinance No. 110 regulates "chemical and debris contaminated soil" as "Industrial Waste." This includes soil with contaminants detected below SRVs. All applicable federal, state and county rules will be followed in managing soil materials. Soil excavated during the project with impacts that exceed Tier I SRVs will disposed at an off -site landfill licensed to accept the waste. Management of soil with concentrations of potential contaminants below the Tier I SRVs will be performed in accordance with MPCA guidance for unregulated fill. Because of the land's proposed future uses, residential SRVs apply to the UMA. If portions of the UMA are rezoned for industrial or commercial land use during the development process, then industrial SRVs would apply in those areas. 6 Under County Ordinance No. 110: in general, contaminated soil may remain undisturbed if it meets the appropriate SRVs. For beneficial reuse, the County allows excavated, contaminated soils to be reused within the project area (i.e., within the UMA) if the soils meet appropriate SRVs and there is a protective barrier of clean soil or pavement over the reused soil. A timely property disclosure will be required for each location where contaminated soils are relocated. If contaminated soils are to be moved once for example, placed within a berm and then relocated again years in the future, separate property disclosures will be required for each relocation. In areas for which a property disclosure has been filed, if the contaminated soils are subsequently removed or remediated, an amended property disclosure may be filed, clearing the site. If soil exceeds SRVs, it should be removed from the site for legal disposal. If soil is imported to the site, it must be clean. The process for addressing these issues will follow established procedures and requirements of applicable law. 21. Environmental Contingency Plan (ECP prepared by Barr Engineering for Dakota Aggregates for the UMORE Mining Area, dated June 2012) The phase -by- phase, pre development inspection proposed in the ECP will be critical in ensuring that environmental problems from the past are investigated and appropriately remediated before each phase of activity proceeds. County staff's opinion is that some of these areas have been preliminarily evaluated, but have not been conclusively delineated. Comment noted. Dakota Aggregates will implement the pre development process outlined in the ECP, which is designed to identify the presence of environmental conditions that may require response action. Environmental Contingency Plan: Asbestos Asbestos containing materials (ACM) in the soils are a particular concern for all of UMORE Park. The proposed pre development inspection by a licensed asbestos inspector and the annual worker training, described in the ECP, will be important in protecting worker safety and in remediating the UMA for post mining development. County staff recommend that the ECP specify that, on a phase -by -phase basis, the "footprints" of any GOW -era structures be identified and the soils in those areas sampled and analyzed for the presence of asbestos fibers, prior to site disturbing activities. The ECP will be modified to specify that all identified former GOW structures will be evaluated for potential asbestos containing materials (ACM). If visible ACM is encountered, Dakota Aggregates will implement the site -wide asbestos Emission Control Plan Referenced in the ECP. Environmental Contingency Plan: Unsealed Wells County staff recommend that the ECP specify that the annual worker training include how to identify unsealed wells, so workers will respond appropriately if buried, unsealed wells are uncovered in the course of excavation. The ECP will specify that the required training will include identification of unsealed wells. Environmental Contingency Plan: Arsenic 7 Arsenic in shallow soils could also be of concern for UMORE Park. Sampling results from the recent UMORE East environmental investigation support the theory that arsenic -based herbicides were sprayed on the ground around many structures during the GOW era. The UMore East area, which was the subject of the UMore East Remedial Investigation (Barr, 2012) is very different from the UMA in that it was largely unused during the GOW era. As part of the Focused Site Inspection (USACE, 2009), the Phase 11 Environmental Investigation of SOCs 1 -3 and 6 -8 (Barr, 2009), the Supplemental Site Inspection (SOC 4) /Remedial Investigation (SOC 5) (Barr, 2010), and the Auxiliary Use Facility investigation (Barr, 2010), only three of 94 soil samples collected and analyzed during these investigations indicated the presence of arsenic above the Tier I SRV of 9 mg /kg. None of these samples are located in the currently proposed mining area. One of those samples was collected in the DNT storage area (SOC 5) and contained 9.2 mg /kg. The other two samples were collected in SOC 3 (an area of surficial debris) and contained 9.2 and 9.8 mg /kg of arsenic. Both SOC 3 and S005 are located south of the current mining area and in the future, will be the subject of a response action prior to mining activities. In the September 23, 2010, letter from the University of Minnesota to Dakota County, responding to the County's comments on the draft EIS conducted for the UMA, Dr. Muscoplat indicated that complete "step -out" soil sampling would be conducted in the UMA in locations where arsenic above 9 mg /Kg was detected. County staff recommend that the ECP specify that, on a phase -by -phase basis, the "footprints" of any GOW -era structures be identified and soils in the perimeter around the former structure be sampled for arsenic at shallow depths, to be followed by "step -out" sampling in areas where arsenic above 9 mg /Kg is detected. See response to prior comment regarding step out sampling in areas where arsenic or other compounds were identified in past testing at levels exceeding Tier SRVs. The procedures set forth in the ECP will be followed with respect to evaluation of structures and building footprints present in the project area. Environmental Contingency Plan: Specific Areas of County Concern The pre development inspection, worker training, and the identification of the contingency items listed in the ECP will be extremely helpful in identifying other potential problems once excavation begins. However, some contaminants may not be readily identifiable. Contaminants of concern may be present at levels high enough to pose a risk to human health and ecologic receptors but not be detectable by sight or smell. In areas that have been contaminated by past practices, the County's enforcement authority under Ordinance No. 110 generally comes into effect once the old wastes including contaminated soils have been disturbed and /or relocated. County staff have described specific areas in their supplemental comments regarding the EIS, at the end of this document. Comment noted. Environmental Contingency Plan: Comments on Specific Components 2.3 Identification of Contingency Items 8 County staff recommend that "apparent fill soils" be added to the conditions or observations that may trigger a more complete assessment of an area, because of the possibility that the fill included materials that were contaminated elsewhere and relocated. The term "apparent fill soils" will be added to the ECP. Apparent fill soils are those that are identifiable by inclusion of visually noticeable materials that are of solely anthropomorphic origin. 2.4 Contingency Process Item #7, Communication of Findings: the ECP should specify that the County must be contacted prior to the completion of a full assessment, in accordance with County Ordinance No. 110, Section 14.00. The ECP will be modified to indicate that City of Rosemount and Dakota County staff will be copied on communications with the MPCA regarding implementation of the Contingency Process outlined in this section of the ECP. 2.5.1 Non hazardous Materials The ECP should specify that if non hazardous contaminated materials are encountered during excavation, County staff will be notified and the assessment and intermediate and final disposal of waste will be conducted in accordance with County Ordinance No. 110. The procedures set forth in this section of the ECP will be followed with respect to any non hazardous contaminated material encountered during project. Any non hazardous contaminated material exceeding Tier I SRVs will be removed and disposed at a facility licensed to accept the waste. Management of soil with concentrations of potential contaminants below the Tier I SRVs will be performed in accordance with MPCA guidance for unregulated fill and Dakota County Ordinance No. 110. 2.5.2 Hazardous Materials The ECP should specify that management of hazardous waste will be coordinated with the MPCA and Dakota County, and that all assessment and intermediate and final disposal of hazardous waste will be conducted in accordance with federal, state, and County regulations. The ECP will be modified to state that applicable federal, state and local regulations will be followed in addressing any Hazardous Waste encountered during the project. Comment noted. 22. Response Action Plan The Response Action Plan process is generally appropriate as described. As noted above, any identified releases are subject to regulation under County Ordinance No. 110, and the procedures and requirements specified under County Ordinance No. 110, Section 14.00 should be followed, in addition to those of the MPCA. Comment noted. 23. Location of any and all existing wells and the size and depth thereof County staff recommend that the Extraction Permit specify that former farmsteads will be investigated to locate and have sealed any unsealed wells, as regulated by the Dakota County Delegated Well Program. 9 All known sealed or unsealed wells will be investigated prior to mining. 30. Stockpiling (Accessory Use) County staff recommend that the Extraction Permit specify that any contaminated materials to be stockpiled will be managed according to #20 Potential Soil Contamination, above. Comment noted. 32. Ancillary Use Facility The placement of the AUF in an area of lower aquifer vulnerability than the surrounding areas may be helpful in preventing groundwater contamination, but should not be relied upon. County staff recommend that the Extraction Permit specify the following: Vehicle and equipment maintenance involving petroleum products will be conducted on impermeable surfaces; The Environmental Protection Agency and Minnesota Pollution Control Agency include gravel roads (compacted Class 5 surface) within their definitions of impervious surfaces. HydroCAD software also considers a curve number of 96 to be a reasonable estimate for gravel surfaces. The design parameter used for the stormwater calculations within the Ancillary Use Facility for compacted Class 5 was a 98, the same as that for concrete. Any vehicle maintenance involving petroleum products occurring within the AUF will therefore be performed on concrete, asphalt, or a compacted Class 5 surface. Areas where pollutants are stored, dispensed, generated or managed will be managed through covered containment including impervious flooring and a weather resistant roof to prevent contact with precipitation. DA concurs. Runoff from the AUF will not be directed in the direction of the future lake. All runoff from the AUF will be directed to and contained within the AUF storm water basin located in the northeastern portion of the AUF. A Dakota County Hazardous Waste facility permit will be obtained and maintained for the generation of waste oils. DA Concurs. 32. E Aggregate Processing and Recycled Aggregate Production Products (RAP) County staff recommend that the Extraction Permit specify that the RAP stockpiles be stored on an impermeable surface, and that runoff from this pile be collected and treated prior to discharge offsite, because of the potential presence of asphalt and contaminants including metals, PAHs, and DRO /GRO, 10 The RAP stockpiles will be stored on a compacted Class 5 surface. A sediment basin will collect the stormwater from the AUF and the dry basin will not allow runoff to leave the site in a 100 -year storm event. County staff recommend that the Extraction Permit specify that 1) fines from wash water will be evaluated for contaminants of concern, including SVOCs, PAHs, metals, and total petroleum hydrocarbons; 2) material (fines) exceeding MPCA industrial SRVs must be disposed of at a licensed solid waste facility; and 3) fines with levels of contamination above residential SRVs but below industrial SRVs may be stockpiled on site but not allowed to be removed from the AUF facility (except for disposal at a licensed facility). Sampling of the fines from the wash water in the Aggregate Processing Facility will not be necessary since this water is used only for the washing of virgin material. 35. Appearance, Screening, and Berming County staff recommend that the Extraction Permit specify that any contaminated materials to be used for berm construction be managed according to #20 Potential Soil Contamination, above. 36. Hours of Operation Site security measures are not mentioned in the Extraction Permit. The City may want to consider including such measures, to limit access by unauthorized persons and to prevent illegal disposals. 44. Surface Water Protection Plan The City of Rosemount's current Comprehensive Surface Water Management Plan designates the UMA artificial lake as a receiving basin for stormwater. When the Surface Water Management Plan is next updated, County staff recommend the City not use the UMA artificial lake for infiltration, because of the proposed lake's potential impacts on the City's future drinking water supply, described in #6 Introduction above. 46. Drainage characteristics during extraction, erosion control County staff recommend that best management practices (BMPs) such as permanently vegetated buffers be employed around agricultural plots to prevent agricultural runoff and subsurface leaching from degrading the water quality of the new lake. DA Concurs. 49. Topsoil County staff recommend that the Extraction Permit specify that topsoil must be managed as described in #20 Potential Soil Contamination, above. 51. Maintenance of Mining Vehicles County staff recommend that the Extraction Permit specify that 1) any vehicle maintenance activities involving petroleum fluids will be conducted on an impermeable surface and that 2) a spill kit with the equipment and supplies necessary to contain and clean up spills of fuels or other contaminants be available on fixed sources of pollutants and on all mobile equipment, diesel generators, and vehicles. 11 Fueling and spill kit information is covered in the SPCC and DA will adhere to MPCA rules regarding fueling and Spill Kit guidance. 54. Site Reclamation, Rehabilitation, and Restoration County staff recommend that the Extraction Permit specify that 1) soils used for site reclamation must be managed as described in #20 Potential Soil Contamination, above; 2) contaminated materials will not be used in reclamation areas where stormwater drainage will flow into the new lake; and 3) soils imported to the site must be clean. Interim Use Permit Application for Aggregate Processing and Recycled Aggregate Production in the Ancillary Use Facility (AUF) and Annual Operating Permit Application for Dry /Wet Mining Sub -Phase 1A Comments regarding the Extraction Permit are applicable to the Interim Use Permit for Aggregate Processing and Recycled Aggregate Production in the AUF and to the Annual Operating Permit Application for Dry /Wet Mining Sub -Phase 1A. The permit applications appear to indicate that soils or other overburden material will not be evaluated for contamination until the eventual time of re- spreading. Soil materials that are not from an area associated with a land use or source material that could have been a source for release are assumed to be essentially natural soils unless there is detectable visual or olfactory evidence to the contrary. The ECP describes detailed procedures that will be followed to detect and respond to environmental conditions including potentially impacted soils. County staff recommend that the respective permits specify that soils will be evaluated for contamination before excavation, in order to avoid improper hauling, relocation, or reuse of contaminated materials in violation of County Ordinances No. 110, Solid Waste Management, or No. 111, Hazardous Waste Management, and applicable State and federal regulations. 12 Supplemental Comments on the Final Environmental Impact Statement, University of Minnesota UMORE Park Sand and Gravel Resources, October 2010 In addition to the Dakota Aggregates' mining permit application, City of Rosemount staff requested that County staff provide supplemental comments on the EIS prepared by the University of Minnesota in October, 2010, for the UMA. For the Extraction Permit review, County staff have particularly concentrated on the Ancillary Use Facility (AUF), because during the Environmental Impact Study (EIS) process, the proposed location of the AUF shifted. As a result, County staff comments about the EIS regarding the AUF area were limited. In addition, the AUF is the area in which land- disturbing activities are proposed to begin the soonest. Site of Concern (SOC) 1 in the EIS is no longer included in the UMA. SOCs 3 through 8 are in Empire Township, not within the City of Rosemount. SOC 2 is included in the discussion of the AUF. In addition to SOC 2, several additional areas were investigated within the AUF and adjacent areas as cited above. Ancillary Use Facility (AUF) Site 5616 Salvaged Material Storage Yard and 5288 Reinforced Steel Warehouse (Building 234 -T) Located in the northeast area of the AUF, building 234 -T was constructed for use during construction of the GOW facility. Building was in use from 1942 until 1946 for unspecified uses. The 1945 air photo of the building shows an estimated 3 -acre area of storage of unknown materials surrounding the building; an additional 9 -acre area adjacent to the storage yard is heavily disturbed and indicates unknown material storage, haul roads, stockpiles and areas of apparent excavation /filling. It does not appear that filling occurred in this area. Test trenches indicated what appear to be native soil materials. Recommendations: Exploratory excavations are urged for suspect areas visible on the 1945 air photograph, at density consistent with MPCA Sampling Guidance. Further evaluation, including sample collection and analysis, would be triggered by the identification of contingency items described in 2.3 of the ECP. Additional excavations may be necessary to determine the extent and magnitude of suspected disposals /releases. County staff recommend soil sample analysis for RCRA metals, semi volatile organic compounds (SVOCs), petroleum hydrocarbons (DRO /GRO), and asbestos where indicated. Additional test trenches were added north of SOC 2 at the County's request during the UMA and AUF soil investigations. The results did not indicate the presence of potential contaminants. Site 5612 Lumber Storage Originally covering 20- acres, approximately 10 -acres of the former GOW Lumber Storage facility is located in the northwest corner of the AUF. Operational details of this storage area facility are not available, but it appears from the 1945 aerial photograph of the area that lumber and other unspecified materials were stored in a grid pattern created by crushed limestone roadways. Fire protection lines did not extend to this area of the GOW. This lack of fire fighting infrastructure required the adoption of 13 strict fire prevention strategies including vegetation and weed control. The use of arsenical herbicides is suspected have been used in this area owing to the flammable nature of the stored lumber. Recommendation: Exploratory excavations are urged for suspect areas visible on the 1945 air photograph, at density consistent with MPCA Sampling Guidance (approximately four per acre). No fewer than twenty surface soil samples are recommended, to be collected and analyzed for contaminants of concern including SVOCs (wood preservatives such as creosote and pentachlorophenol), RCRA metals, and asbestos where indicated. As described above, the presumed use of arsenical herbicides is not supported by sampling data. This area was investigated during the UMA soil investigation and no evidence of contamination was encountered. Therefore no further investigation is proposed. Site 5678 -Heavy Gauge Rail Trackage Approximately %2 mile of heavy gauge rail trackage constructed in 1942 for the transportation of raw materials, equipment and finished products crosses the western portion of the AUF. Railroad ties were constructed of creosoted timbers. Arsenic -based herbicides may have been used to control vegetation. In the period air photograph, a loading /unloading and surface storage area is visible east of the intersection of the Heavy Gauge Rail Trackage and present -day County Road 46/48. Unknown materials are visible east of the tracks on a limestone working surface. Previous sampling of the Heavy Rail Trackage has identified elevated concentration of PAHs. Several test trenches were collected from this rail bed during the AUF Preliminary Subsurface Investigation but no samples were analyzed from the shallow surface soil where contamination is most likely to be present. Recommendation: Exploratory excavations and sample collection are recommended along the former rail bed. Shallow soil samples are recommended every 100 lineal feet along the rail bed. A minimum of six additional shallow soil samples are recommended from the one -acre transfer /temporary storage surface visible on the 1945 air photograph. County staff recommend soil sample analysis for contaminants of concern including SVOCs, RCRA metals, and asbestos where indicated. This area was investigated during the supplemental AUF soil investigation. No evidence of contamination was encountered and no additional sampling is proposed. 1945 Soil Disturbance Area Southeast Area of the AUF In the 1945 aerial photograph, this 9 -acre area located in the southeast corner of the AUF is heavily disturbed and supports haul roads, stockpiles and areas of apparent excavation and filling. A portion of this disturbance was investigated in the AUF Preliminary Subsurface Investigation and incidental debris, including concrete pier footings, was identified. Recommendations: Exploratory excavations are recommended in suspect areas, visible on the 1945 air photograph, at density consistent with MPCA Sampling Guidance. Further evaluation, including sample collection and analysis, would be triggered by the identification of contingency items described in 2.3 of the ECP. Additional excavations may be necessary to determine the extent and magnitude of suspected 14 disposals /releases. County staff recommend soil sample analysis for contaminants of concern including RCRA metals, SVOCs, petroleum hydrocarbons (DRO /GRO), and asbestos where indicated. Any areas requiring excavation to support the ancillary activities will be sampled for contaminants of concern to avoid inadvertent handling of potentially impacted soils. Agricultural Experiment Station (AES) Sites County staff recommend that past AES Agricultural Research Sites be investigated for shallow soil contamination from RCRA metals and recalcitrant pesticides. County staff recommend that the past AES Sewage Sludge Application Sites be investigated for shallow soil contamination from RCRA metals, perfluorochemicals, petroleum products, pesticides, and SVOCs. Comment noted. 15 4 ROSEMO PUBLIC WORKS MEMORANDUM DATE: August 22, 2012 TO: Eric Zweber, Planner CC: Kim Lindquist, Community Development Director Andrew Brotzler, Director of Public Works /City Engineer Chris Watson, Management Analyst Kathie Hanson, Planning Department Secretary FROM: Phil Olson, Assistant City Engineer RE: Umore Aggregate Permit: Stormwater Review SUBMITTAL: On June 28, 2012, the Umore Park Large Scale Non Metallic Mineral Extraction Permit Application, Interim Use Permit Application, and Annual Operating Permit Engineering were submitted for review. The engineering department offers the following comments. STORMWATER MANAGEMENT COMMENTS: 1. The site is required to handle the proposed conveyance of runoff from areas outside of the property as shown in the City's Stormwater Management Plan. The timing of when the site will be required to accommodate this drainage is not currently known. 2. The proposed berm along Biscayne Avenue will obstruct the stormwater overflow routes and proposed discharge points to the site. The proposed stormwater inflow locations were identified in the EIS comments for inclusion in the Stormwater Management Plan. The site is required to handle the stormwater overflow conveyance from the business park to the west as shown in the Stormwater Management Plan. 3. The proposed berms along CSAH 46, Akron Avenue, and CSAH 42 appear to impact the roadway drainage patterns. Grading within the Dakota County right -of -way or grading with impacts the drainage of these roadways is required to be permitted through Dakota County. 4. Stormwater management calculations are required to be submitted for the haul road on the north end of the site. 5. The existing drainage patters in some areas of the northern mine buffer area currently flow the south. The construction of a berm on the south side of the buffer area will restrict these drainage patterns. Additional piping or ponding is required to maintain these drainage patterns or retain the stormwater. Additional submittals are required to address this issue. AUXILIARY USE FACILITY (AUF) COMMENTS: 6. The stormwater management calculations including retention, treatment, and infiltration are required to be submitted for the AUF. The City requires treatment to NURP standards. The stormwater conveyance system design calculations at the AUF are also required to be submitted for review. 7. Drainage and utility easements are required over the stormwater ponds in the AUF. The stormwater ponds and infiltration basins are required to be naturally vegetated. 8. The stormwater management calculations for each phase of the AUF are required to be provided to verifv the appropriate size sediment basin and stormwater storage volume. 9. The interim reclamation plan and the final reclamation plan are required to be shown on Sheet 3.00 and Sheet 4.00. 10. The lowest floor elevation of the proposed buildings is required to be shown on the plans. The City's freeboard requirements will be verified with the building permit. SECTION 4 SPCC PLAN 11. The asphalt plant area spill direction should be verified on page 11. It appears that the spills would be directed to the north to the sediment basin. 12. The containment plan for the asphalt plant indicates that an earthen berm is proposed. The containment plan for the asphalt plan and maintenance garage will be reviewed with the Interim Use Permit. SECTION 6 ENVIRONMENTAL CONTINGENCY PLAN (ECP) 13. 2.4 Contingency Process. The City is required to be included on the Initial Contact list. 14. 2.5.4 Buried Debris and Asbestos Containing Materials The reference to section 3.2.1 is unclear. Please verify this reference is correct. SECTION 7 ENGINEERING MINE OPERATION PLAN SHEETS 15. Sheet 1.04 Site Information Existing Drainage The listing of off -site drainage culverts appears to be incomplete. The existing culverts and drainage pipes on Biscayne Avenue, CSAH 46, CSAH 42, and the perimeter of the site are required to be shown on the plans. 16. Sheet 1.05 Site Information Proposed Drainage The drainage patterns should be verified in the AUF. Directional flows are required to be shown on the plan. 17. Sheet 1.05 Erosion Sediment Control Details The sediment basin skimmer should be consistent with the City of Rosemount details. The skimmer detail is required to be added to the plans. 18. Sheet 1.07 Aggregate Plant Ancillary Facilities- Access Road, Site Operations Interim /End Reclamation Plan A City access permit is required for access Ni to Biscayne Avenue. SECTION 7 LARGE SCALE MINERAL EXTRACTION PLAN 19. All of the MCES sanitary sewer lines are required to be shown on the plans. A plan is required to be submitted showing the removal or abandonment of the existing sanitary sewer line through the north end of the property. Should you have any questions or comments regarding the items listed above, please contact me at 651 322 -2015. O c7C Oa fr 4 D r'o G-Vav dC- fie, ll'\ i r, o +T o Q a"-• Co f T �f `f Th-e_ h; o 2 S< W owl a u s- 5 &M. flee. t —C4; c a� 1 1 Z, Iv16sr'- hd ate`) (e✓ ,l f3So c.,rt, L4 ,J 5 Received Aft AUG 232012 City of Rosemount Planning Commission 2875 145 Street West Rosemount, MN 55068 Planning Commission: I am unable to make the public hearing but did want to voice my concerns. I have been a local resident all of my life which is 60+ years. Over the years watching and hearing all the concerns and the things going on at this site was never dull. My husband worked at Technical Ordinance, a business on that site, and his memories are NOT pretty. History of that ground assures me that it is all very polluted and should first undergo an extensive clean up before any work or even consideration of work has begun. Including but not limited to the contaminated dirt that was hauled in. This cleanup expense should be covered by the University and Dakota Aggregates, LLC. If you do decide to allow them to start the mining, etc. before a thorough clean up, please make sure that you have in writing and signed by all that any contamination to ground, air or water will be cleaned up and restored at their expense. The potential to contaminate the ground water or water table is very real. That needs to have a high level of protection for the residents of Rosemount. Your first priority and consideration should be for the health and welfare of the citizens of Rosemount. Thank you for listening, Ruth Pryor 4 14755 Bloomfield Circle Rosemount, MN 55068 Received AUG 23 2012 City of Rosemount August 22, 2012 4 LIE City of Rosemount AU K 2 3 Planning Commission S da 2875 145 St. W _Qv Rosemount, MN 55068 A '0D Re: Dakota Aggregates, LLC August 28, 2012 Hearing Dear Planning Commission: In the event I cannot attend the meeting on 8/28/12 I would like the committee to address some concerns regarding the mining of aggregate so closely to a densely populated neighborhood. After the city paid over one million to put in whistle free train crossings how much noise will be produced by the mining? What is an acceptable decibel level if you were standing at County 42 and 145 St? In the event too much noise is produced how will the city address future concerns when noise is greater than stated by Dakota Aggregates? How is truck traffic going to be routed? Will my family be able to sit on the deck and enjoy the outdoors without noise pollution? Another concern is constant dirt residue in the air. Already when the field is tilled twice yearly my deck, deck furniture, windows, and siding are coated with dirt. How and who is going to clean up the constant mess? Will my family be able to eat on the deck without removing daily coatings of dirt before we can use our deck? How much tax revenue does the city stand to capture by allowing this mining at my expense? Is the city going to compromise the comfort of my home living to benefit financially? Thank you for addressing my concerns. Sincerely, 5 aun Nelson 14388 Bentley Way Rosemount, MN 55068