HomeMy WebLinkAbout2.a. Dakota Aggregates Discussion 4 ROSEMO EXECUTIVE SUMMARY
PLANNING COMMISSION
Planning Commission Work Session: September 11, 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. 2.a.
ATTACHMENTS: Location Map; Phasing Map; Large Scale
Mineral Extraction Permit Application;
Annual Operating Permit Application;
Aggregate Processing Interim Use Permit APPROVED BY:
Application; Hydrogeologic Study and
Water Monitoring Plan; Excerpt of the
August 28 Planning Commission
Minutes; Resident Letters
RECOMMENDED ACTION: Discussion.
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 this Planning Commission work session is to review the resident and Planning
Commissioner concerns raised at the August 28 meeting and discuss potential permit conditions to
address those concerns. The Planning Commission will continue the Public Hearing on September 25 and
it is anticipated that Staff will prepare a formal recommendation and permit conditions for action at that
meeting.
August 28 Planning Commission Meeting and Public Hearing
During the Public Hearing at the August 28 Planning Commission meeting, five residents testified
regarding drinking water protection, dust, traffic and noise. Additionally, the City received three letters
from residents expressing concerns about the same issues; drinking water protection, dust, traffic and
noise. Staff has attached to this Executive Summary an excerpt of the August 28 Planning Commission
minutes and the three resident letters. The following sections of the Executive Summary will describe how
the proposed mining application addresses drinking water protection, dust, traffic and noise, as well as a
discussion of hours of operation which has a large affect on the traffic and noise issues.
Hydrogeologic Study and Water Monitoring Plan
Barr Engineering has revised the groundwater monitoring plan based on staff comments. The biggest
change to the plan is the addition of a fifth down gradient monitoring well, RMW -6, in dry mining phase
9A to monitor the groundwater from the northwest corner of the lake that is modeled to enter bedrock in
a short horizontal distance. The revised groundwater monitoring plan includes a total of five down
gradient monitoring wells, two up gradient monitoring wells, and three surface water monitoring locations
within the lake. Within 180 days of the permit issuance, five monitoring wells will be established (RMW -3,
RMW -4, RMW -5S, RMW -5D, and existing monitoring well MW -B1 -001) and monitoring will begin.
Monitoring well RMW -1 will be installed before existing well MW -B1 -001 would be sealed and abandoned
when dry mining Phase 6A is permitted. Monitoring wells RWM -2 and RMW -6 will be installed at least
two years before wet /dry mining Phase 5A is permitted. Staff is supportive of the number, location, and
timing of the monitoring wells, but the last item that staff needs to review and confirm is the
location /depth of the screening interval of the monitoring wells. Staff wants to ensure that the well is
testing the water at a depth that would lead eventually to the potential City wells 16, 17, and 18. To assist
in that review, staff has requested that Figure 17B be revised to show the actual screening interval of
monitoring wells RMW -1, RMW -2, RMW -3, RMW -4, and RMW -6.
Staff recommends four revisions to the groundwater monitoring plan, which clarify staff's understanding
of the intended plan First, revise the description of the bituminous patch plant within the drinking water
supply management area (DWSMA) on pages 20 and 21. There is information on the design of the
asphalt plant in the spill prevention plan that can be added to this description. Second, revise Table 2 to
describe that the existing monitoring wells MW -C2 -002 and MW -C2 -202 will be abandoned and sealed
within 180 days of permit issuance. Third, revise Figure 17A to show that monitoring well RMW -3 will be
installed within 180 days of permit issuance. Fourth, revise Figure 17B to show the actual screened
interval for monitoring wells RMW -1, RMW -2, RMW -3, RMW -4, and RMW -6.
Hours of Operation
Dakota Aggregates has proposed 24 hour, 7 day a week operation for the aggregate processing and the
mining of wet /dry mining phase 1A. The Large Scale Mineral Extraction (LSME) Ordinance states for
aggregate processing and mining allows an additional 5 Sunday exception:
"Hours of Operation: The hours of operation shall be limited to 7 a.m. to 7 p.m. Monday through
Saturday unless special permission is granted by the City Council within the interim use permit.
The extra hours of operation may be conditioned on more restrictive performance standards to
address the adverse impacts caused by the extra hours. The Community Development Director
may authorize Sunday operation from 8 a.m. to 5 p.m. on no more than five (5) Sundays annually
provided the operator notifies the Community Development Director no less than 72 hours before
a Sunday operation."
This language allows the City to grant additional hours, but the City is not required to do so.
During discussions with Dakota Aggregates during the Ordinance writing, they stated that it is important
they have the ability to operate during evenings and weekends because many contracts, particularly for
public agencies such as the Minnesota Department of Transportation (MnDOT) or the Metropolitan
Airports Commission (MAC), require nighttime or weekend construction. Additionally, Dakota
Aggregates has stated that wet mining with dredges is slower and quieter than traditional dry mining. They
request the additional hours for the wet mining to make up for the slower operation.
Since the minin proposed in wet /dry minin phase 1A in 2013 will be all dry mining and will be
conducted by loaders, screens, conveyors and hauling, staff is not supportive of 24 hour /7 day a week
operation for phase 1A. Staff recommends that phase 1A operates per the Ordinance standards for 2013.
Given that the entire mining operation is new, Dakota Aggregates can request additional hours in future
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after the city has experienced the mining activity and determined the noise impacts associated with the
work. Staff does not support the operation of the aggregate processing equipment, such as the crusher,
sorting and stockpiling equipment, longer than the 7 to 7 duration, but staff can support specific 24 hour
hauling operations. Hauling would be considered if the applicant submits a plan showing how the loading
of truck and haul routes can be accomplished without the trucks backing up or unloading and that Dakota
Aggregates has a contract that requires construction after the normal 7 a.m. to 7 p.m. operation..
Dust
Dust in the mining operation is proposed to be addressed in five ways: setbacks, berming and landscaping,
limiting the amount of area open, the ability to temporarily cease operations during high wind events, and
the use of watering trucks. First, Dakota Aggregates has proposed a mining buffer on the south side of
County Road 42 that is a minimum of 1,000 feet from Enclave residents and 1,600 feet from Bloomfield
residents to provide separation from the mine and existing residents. Second, either the existing stand of
trees will be maintained and intensified or a berm at least 10 feet tall will be constructed and landscaped to
provide additional wind breaks between the mine and residents. Third, Dakota Aggregates cannot have
any single area open greater than 80 acres, which is significantly smaller than the mining operations in
neighboring Apple Valley, Lakeville, and Empire Township, to assist in limiting the amount of dust that
can be picked up by the wind. Fourth, the Ordinance allows the Community Development Director to
stop the operation of the mine when a High Wind Advisory is issued by the National Weather Service.
Fifth, Dakota Aggregates will have a water truck on site to be used to wet the haul routes to limit the dust
raised during the hauling operations.
Additionally, staff is recommending a condition that if trucks are installed with protective equipment, like
covers over the truck beds, then the equipment must be used. Dakota Aggregates has stated that most of
their trucks do not have covers, but over the life of the mining operations, equipment installed on trucks
may change.
Traffic
Traffic from the mining operation will be directed to either County Road 42 or County 46. County Road
42 would only be used for the first 15 years of operation of dry mining phases 1 through 7. The first of
those phases would direct traffic to Akron Avenue and County Road 42, while the latter phases (possibly
phases 5 through 7) would access County Road 42 at Biscayne Avenue. Staff has included a condition that
if Biscayne Avenue is used, Dakota Aggregates and /or the University would contribute 50% of the cost of
signal lights for the Biscayne Avenue and County Road 42 intersection. Once dry mining phases 1
through 7 are completed, no mining traffic will access County Road 42.
County Road 46 will be the primary access for the majority of mining traffic. County Road 46 already has
significant mining traffic from the mining operations located in Apple Valley, Lakeville, and Empire
Township.
Dakota County has provided a letter to the Planning Commission stating that County Road 42 and County
Road 46 are planned to be 10 ton haul routes in the future, but currently are posted as 9 ton axle weight
restrictions. Staff has included a condition that trucks must be loaded in accordance with the posted
weight restrictions on the public haul roads.
Noise
Noise is addressed primarily through two manners, distance and hours of operation. The mining
operation will be a minimum of 1,000 feet from the Enclave neighborhood and 1,600 feet from the
Bloomfield neighborhood. The ancillary use facility (AUF), including the crusher at the aggregate
processing area and the future concrete and asphalt production facilities are located along County Road 46
and are at least 4,500 feet from any residents living north of County Road 42. Dakota Aggregates has
requested ancillary uses be permitted for 24 hours a day, 7 days a week operation. As previously described,
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staff is recommending that the 7 a.m. to 7 p.m., Monday through Saturday limitation be observed for all
operations except loading and hauling for construction contracts that require hours beyond the 7 to 7
limitation.
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 issues discussed in this Executive
Summary:
1. Mining in Wet /Dry Mining Phase 1A shall be limited to 7 a.m. to 7 p.m. Monday through
Saturday. The Community Development Director may authorize Sunday operation from 8 a.m. to
5 p.m. on no more than five (5) Sundays in 2013 provided the operator notifies the Community
Development Director no less than 72 hours before a Sunday operation.
2. Crushing, screening, washing, and stockpiling at the aggregate processing facility shall be limited to
7 a.m. to 7 p.m. Monday through Saturday. Loading and hauling at the aggregate processing
facility may occur 24 hours a day, 7 days a week provided the loading and hauling does not allow
trucks to back up or unload and the hauling conducted is for a construction contract requiring
construction outside the normal 7 a.m. to 7 p.m. operational hours. The applicant must submit a
haul road plan which depicts the conditions above for staff review and approval.
3. Revise the Groundwater Monitoring Plan to describe the bituminous batch plant within the
drinking water supply management area (DWSMA) on pages 20 and 21; revise Table 2 to describe
that the existing monitoring wells MW -C2 -002 and MW -C2 -202 will be abandoned and sealed
within 180 days of permit issuance; revise Figure 17A to show that monitoring well RMW -3 will be
installed within 180 days of permit issuance; and revise Figure 17B to show the actual screened
interval for monitoring wells RMW -1, RMW -2, RMW -3, RMW -4, and RMW -6.
4. Protection equipment that is installed on hauling trucks, such as covers for the truck beds, shall be
used while traveling on public roads. Non -use will be considered a violation of the permit
condition.
5. Trucks may not be loaded heavier that the public haul roads posted weight restrictions.
6. 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.
7. Execution of a 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.
8. A City Grading Permit is required for the construction of the haul route from Dry Mining Phase 1
to Akron Avenue.
9. Access permits are required for any access route connection to a public roadway from the
jurisdictional agency in control of the public roadway.
10. Engineered designs for any reclamation steeper than a 3 to 1 slope must be submitted and
approved before the reclamation can occur.
11. 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.
12. 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.
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13. 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 in operation. A knox
box or similar devise shall be installed to provide emergency personal access to the key for the
lock.
14. Provide an End Use Grading Plan for the Ancillary Use Facility (AUF) area.
15. 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.
16. The Casting Yard may not operate beyond December 31, 2022.
17. Conformance with the City Engineer's Memorandum dated August 22.
18. The Environmental Contingency Plan must receive Minnesota Pollution Control Agency approval
before any grading or mining can occur.
19. Add the City of Rosemount and Dakota County Environmental Management to the immediate
contact list if containments or hazardous materials are discovered.
20. 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.
21. Compliance with Dakota County Ordinances No. 110 and 111, as well as all other applicable
Federal, Minnesota, Dakota County, and Rosemount regulations.
RECOMMENDATION
Provide feedback on the Dakota Aggregates proposal and potential permit conditions.
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Dakota Aggregates
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1
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:
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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.
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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
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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 /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)
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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 1AA -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 1AA -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
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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.
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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
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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,
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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)
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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.
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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)
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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
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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:
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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
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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:
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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:
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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. Staffing 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 -11 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 1/2 1 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 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 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. 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/Diy 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 IA through 2B.
Dry/Wet Mining sub -phase lA 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 IA 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 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 1A 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 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 1BB 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)
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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)
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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 +1- 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 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
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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. The mining operation is part of the long term master plan.
29) Washing/Wash Plant- a machine which sand and gravel s conveyed into, separated by size,
washed, dewatered, and then sent to stockpiles for load out.
34
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 lA 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 1 A 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 1A -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 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 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.
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
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 lA 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
Hydrogeologic Study and Water Monitoring
Plan
UMore Mining Area
Dakota County, Minnesota
Prepared for
Dakota Aggregates, LLC
August 2012
BARR
Hydrogeologic Study and Water Monitoring
Plan
UMore Mining Area
Rosemount, Minnesota
Prepared for
Dakota Aggregates, LLC
August 2012
4700 West 77 Street
Minneapolis, MN 55435 -4803
Phone: (952) 832 -2600
BARR Fax (952) 832 -2601
11.1111.11111111.
Hydrogeologic Study and Water Monitoring Plan
UMore Mining Area
Rosemount, Minnesota
Prepared for
Dakota Aggregates
August 2012
Table of Contents
1.0 Introduction 1
1.1 Purpose 1
1.2 Background and Setting 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 7
2.3.7 g) Measures That Will Be Taken to Avoid, Prevent, Contain, and Detect Potential
Releases 8
2.3.8 h) Depth to Prairie du Chien Aquifer and Determine the Appropriate Separation
between the Mining Activity and Bedrock 8
2.3.9 i) Other Information as the City May Require 8
3.0 Hydrogeologic Setting 10
3.1 Geologic Setting 10
3.1.1 Paleozoic Deposits 10
3.1.2 Quaternary Deposits 11
3.2 Hydrogeologic Setting 11
3.3 Hydrostratigraphy 12
3.4 Aquifer Characteristics 13
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3.5 Conceptual Flow Model 13
3.6 Groundwater Flow Model 14
3.6.1 Predictive Simulations Flow Directions 14
3.6.2 Predictive Simulations Worst Case Scenario Release Evaluation 15
3.6.2.1 Diesel Fuel Release into Groundwater 16
3.6.2.2 Pesticide Tank Rupture into Groundwater Excavation (Mine -Pit Lake) 17
3.7 Monitoring Zones 17
4.0 Monitoring Strategy 19
4.1 Monitoring in the Drinking Water Supply Management Area 19
4.2 Monitoring Other Areas and Protection of Sensitive Receptors 22
4.2.1 Upgradient Monitoring 22
4.2.2 Ancillary Use Facility 22
4.2.3 Drinking Water Supply Wells 22
5.0 Water Monitoring Network 24
5.1 Monitoring Wells 24
5.1.1 Monitoring Well Locations 24
5.1.2 Well Construction 25
5.1.3 Well Monitoring Intervals 25
5.1.4 Baseline Monitoring and Statistical Analysis 26
5.1.5 Monitoring Parameters 26
5.2 Surface Water 27
5.3 Monitoring Parameters 27
5.3.1 Monitoring Parameters Not Included in UMA Groundwater Monitoring 27
5.4 Monitoring Frequency 28
5.5 Sample Collection 29
5.6 Response Actions 29
6.0 Laboratory Analysis 30
6.1 Laboratory Procedures 30
6.2 Laboratory Instrument Calibration 30
6.3 Laboratory Quality Assurance 30
6.4 Laboratory Corrective Action 31
7.0 Reporting and Schedule 34
7.1 Reports 34
7.2 Well Construction and Other Data 34
7.3 Schedule 34
8.0 References 35
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List of Tables
Table 1 Existing Water Wells within 300 feet
Table 2 Monitoring Well Construction Details
Table 3 Modeled Rosemount Municipal Well Pumping Rates
Table 4 Analytical Parameters, Methods and Reporting Limits
Table 5 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 12A Particle Traces from Approximate Lake Boundary 2050 Pumping Conditions
Figure 12B Particle Traces from the Proposed Lake Bottom 2050 Pumping Conditions
Figure 12C Cross Section View of Particle Traces from Pit Lake Bottom 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 17A Proposed Monitoring Well Locations
Figure 17B Conceptual Monitoring Well Configuration
Figure 18 Surface Water Monitoring Locations
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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 (City), Minnesota (Figure 1).
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. This Plan also
provides information for the establishment of a release detection monitoring program. The program
will:
Provide timely detection of a potential release of petroleum or hazardous substances into
water or into groundwater. For the purposes of monitoring timely means within 4 to 6 years
of a previously unknown release into groundwater or within 1 year of a known release (e.g. to
surface water or as part of spill response).
Conduct baseline monitoring at each network location to establish existing or background
water quality conditions from those of mining operations.
Establish a detection monitoring network of sampling locations and wells that is positioned to
achieve timely detection and along likely flow paths from currently known or anticipated
source areas during routine sampling.
Routine detection monitoring network is established based on known or anticipated source
areas such as the groundwater excavation area.
The monitoring network may be expanded as required to address specific spill or operational
areas that may be identified in the future if potential sources become apparent or as required
by other regulatory agencies if a release occurs into soil or groundwater.
1.2 Background and Setting
The proposed mining area and AUF are part of the UMore Mining Area (UMA), 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
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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.
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 1I effort. Dinitrotoluene (DNT), aniline, oleum, dibutyl phthalate (DBP), and
diphenylamine (DPA) were imported for use in the smokeless gunpowder manufacturing process.
None of these processes were located at the Site. Other potential constituents related to the former
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GOW include metals, herbicides, asbestos, and volatile and semi volatile organic compounds. 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 three Phase 1 Environmental Site Assessments (Peer, 2006; Barr, 2009a; Barr,
2010a) and were the subject of environmental investigations (Barr, 2009b; Barr, 2009c; Barr, 2010b)
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, 2010b). 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
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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. For the dry mining areas, the mining excavation will
be no closer than 2 feet above the groundwater table. This separation distance will be determined
based on annual groundwater monitoring and other measurements in the field (i.e., small test pits to
spot check water levels). 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 5,000 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 /portable 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
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mobile equipment or the underwater electric dredge and 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 an oil 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.
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The results of 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 to no less than 15 feet 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 for these existing wells is included in Table 1. Wells within the mine area that are
not used for monitoring will be decommissioned in accordance with Dakota County Well Ordinance
114 prior to mining near the well location.
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 silt and sand.
2.3.5 e) Description of Impacts of Proposed Fill Activity
No fill activity is proposed for the groundwater excavation areas except native silt and sand.
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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 plan provides a groundwater monitoring plan that will detect a release in groundwater at the
water table (adjacent to the groundwater excavation) within a few years of the release even though, it
may take many decades before it can reach City pumping wells. The groundwater at the site moves
very slowly and the monitoring wells are positioned for early detection of releases. Monitoring wells
proposed along the downgradient edge of the below -water mining area (this area has also been called
the mine -pit lake or groundwater excavation in various documents) so that evidence of a release from
within this area would need migrate to the groundwater monitoring network prior to reaching the
uppermost bedrock.
In addition to routine monitoring, contingency monitoring will be required as part of a release
response triggered by the SPCC plan and as required by the Minnesota Pollution Control Agency
(MPCA) or Minnesota Department of Agriculture (MDA). Contingency actions will be the primary
type of monitoring in the portions of the mine that will be completed above the groundwater table.
This is because an effective monitoring network requires a discrete source or sensitive area (such as
the groundwater lake). Since no such area currently exists in the northern portion the mining area,
and there will be significant thickness of unsaturated materials to serve as a protective buffer,
contingency monitoring will be the most effective means of responding to, and cleaning up a
potential release. Random placement of wells in this area prior to mining will not result in an
effective network because there is little chance that they would be located in an appropriate position
to monitor the release.
If a spill occurs, the appropriate agency will be notified according to state statute which will begin a
mandated process of investigation and corrective action in accordance with rules and guidance
established by the MPCA and /or MDA. The process will include a limited site investigation
consisting of soil sampling at the base of the excavation. If groundwater is impacted (e.g. if spill
response could not remove the release and /or the release was into the lake) at least three groundwater
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monitoring wells will be installed in the immediate vicinity of the release to characterize water
quality and ensure that the spill does not migrate with groundwater. Additional wells may be required
and a corrective measures evaluation will determine what actions are appropriate to reduce
concentrations to mandated levels. These actions may include for example, groundwater extraction,
sparging, or enhanced methods of natural attenuation as approved by the appropriate regulatory
agency. Required contingency monitoring will become part of this plan for the duration that such
monitoring is required.
This monitoring plan also 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.
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 base of the mine and underlying bedrock varies from
about 15 to over 120 feet. The minimum distance between the base of the mined area and the
bedrock will be maintained at no less than 15 feet. Only a small portion of the groundwater lake will
reach this depth. Under current conditions, the travel time in groundwater from the center of the lake
to bedrock is generally in excess of 10 years. Travel times in groundwater from the deepest part of
the lake are on the order of several years. Under future maximum pumping conditions with additional
City supply wells the travel times decrease but are still relatively slow, on the order of 6 years from
mid -lake to 1 to 2 years from the base of the lake. This is a very conservative estimate because it
assumes that at the time the pumping wells are operational there is still a minimum of 15 feet
between the open water and the top of the bedrock. The base of the lake will have been filled with
reclaimed native fines as a result of natural sedimentation by that time.
2.3.9 i) Other Information as the City May Require
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 and are presented in the plan:
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1. Locations of potential future City 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.
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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
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;
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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.
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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).
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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 -5
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 /day, porosity of 0.25, and horizontal gradient of 0.003.
For hydraulic conductivity of 1.6 feet /day, the flow rate would be 0.02 feet /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
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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). Figure 11 provides cross sections of flow under current pumping
conditions oriented along the major east -west axis of flow in the model.
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 results of the 2050
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.
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.
The groundwater model was used to simulate the groundwater flow field with the projected 2050
well locations and pumping rates provided by the City. Pumping rates used in the model are shown in
Table 3. No low conductance layer (i.e., a layer 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
modeled groundwater flow field was then used to evaluate horizontal and vertical flow from the
bottom of the mine pit lake. 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. 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.
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Under the projected 2050 pumping 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 (note that the Prairie du Chien
Group is in model layer 5).
The assumption that there would be no low conductance layer at the bottom of the mine pit lake is a
very conservative assumption. Native 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 forming 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 would likely result in the modeled travel time being much shorter than is likely to occur.
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, 2010c).
The AUF is an area of low aquifer vulnerability that is not within the current Rosemount DWSMA,
although it is within the projected 2050 DWSMA. In an area of low aquifer vulnerability the travel
time from the surface to the aquifer is several decades to a century due to the presence of a
significant thickness of low permeability material between the surface and the top of the aquifer.
Thus, contaminants from a release at the surface in an area of low aquifer vulnerability are unlikely
to reach the aquifer because the low permeability of the underlying materials do not allow the
contaminants to migrate any appreciable vertical 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, continuous 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 12A and 13, the groundwater flow model indicates that when
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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 to 1,000 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 MPNEID (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
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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 UMore
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 MPNE1D (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
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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 clay till makes it impractical
to monitor the groundwater quality in this area. However it's this low permeability that prevents a
potential release of petroleum or hazardous substances to migrate any appreciable distance before it
can be removed or remediated; thus, the aquifer is classified as having "low aquifer vulnerability,"
according to the MDH.
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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 current Rosemount DWSMA and projected 2050 DWSMA in the vicinity of the UMA are shown
on Figure 16. The current Rosemount DWSMA was approved by MDH on March 18, 2010 (MDH,
2010). 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 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. 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.
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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 a diesel fuel or pesticide release within the mining area would
degrade below risk levels before reaching down gradient receptors (i.e. City wells).
Any releases at the Site will be addressed in accordance with MPCA (or MDA for pesticides)
rules and guidelines for a Limited Site Investigation. Corrective measures will be implemented
including additional monitoring and response activities at 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 D WSMA. 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.
4) Operation of a bituminous batch plant:
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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 applicable
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:
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
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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
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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.
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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 Monitoring Well Locations
The UMA groundwater monitoring system will include routine sampling and analysis events to
determine if the Site is impacting local groundwater. The proposed monitoring well network is shown
on Figure 17A and described in Table 2. The groundwater monitoring system at the UMA will
include existing monitoring wells constructed at UMore Park. The monitoring well network will
consist of the following wells:
RMW -1 (Downgradient) This well is intended to monitor northern portion of the mine area
RMW -2 (Downgradient) This well is intended to monitor the northern mine area and
groundwater moving out of the northern end of the below -water mining area.
RMW -3 (Downgradient) This well is intended to monitor the central mining area and
groundwater moving out of the below -water mining area.
RMW -4 (Downgradient) This well is intended to monitor the southern mining area and
groundwater moving out of the below -water mining area.
RMW -5S (Upgradient) This is an upgradient well used to quantify ambient groundwater
conditions moving onto the site from the west near the water table.
RMW -5D (Upgradient) This is an upgradient well used to quantify ambient groundwater
conditions moving onto the site from the west near the middle portion of the outwash aquifer.
RMW -6 (Downgradient) This well is intended to monitor the north central mine area and
groundwater moving out of the north central below -water mining area. Modeling in this area
indicates that flow is more vertically downward than in other areas due to a wall of low
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permeability till. In order to achieve timely detection, this well is located very close to the
below -water mining area.
MW-B1-001 (Downgradient) This is an existing well in the northern mine area,
MW -C2 -202 (Upgradient) Existing well in the southern mine area.
MW -C2 -002 (Upgradient) This is a water level only water table well in the southern area
nested with C202 that will be used for measuring vertical gradients.
208404 This is a domestic well associated with the University of Minnesota North Beef
Farm. Because this well is relatively far from the mining area and 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 17A. These monitoring wells will be a
part of the long -term groundwater monitoring program associated with the UMA. Well construction
details including the anticipated installation schedule are provided in Table 2.
5.1.2 Well Construction
All new wells will be constructed in accordance with Minnesota Well Code and Dakota County Well
Ordinance 114 for monitoring wells. All wells will be equipped with ten foot -long screens. Unless
otherwise prohibited by Well Code, black steel with a stainless steel riser 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.
5.1.3 Well Monitoring Intervals
In order to provide timely detection all wells are or will be completed in the outwash aquifer within
Quaternary deposits. This is because particle tracking simulations indicated that travel times into the
bedrock are on the order of decades. The shallower outwash wells provide timely detection because
they will be positioned along the average flow path between the below -water mining area and the
bedrock. This location is shown conceptually in Figure 17B.
Well RMW -1 is located along the northern border of the mine area and will be installed as a
replacement to MW -B1 -001 when that well will be decommissioned prior to mining in that area. The
well will monitor groundwater conditions in the lower portion of the outwash above the St. Peter
Sandstone which is the uppermost bedrock in the northern mining area, located downgradient of the
groundwater excavation (Figure 17A) are positioned along an extension of the glacial till that will
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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 17A 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).
5.1.4 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 4 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.
5.1.5 Monitoring Parameters
The monitoring well network will be sampled and analyzed for the parameters in Table 4. 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, pesticides and DNT
to create a baseline to verify that past operations have not resulted in a release of pesticides or
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gunpowder constituents to groundwater. These parameters may be sampled on a reduced frequency if
baseline monitoring indicates that these are not detected in groundwater.
Table 5 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.
5.2 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 4. In addition, general water chemistry parameters, agricultural chemicals and DNT
are also included to detect changes in water quality that may be associated with historic or current
land use (i.e., farming, manufacturing of smokeless gunpowder).
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
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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.
With the exception of DNT, semi volatile organic compounds SVOCs) will not be included. 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. In addition, the e low permeable clay till below the
AUF will confine the potential release of SVOCs to the source area and will not allow migration out
of the AUF.
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 /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.
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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.
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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 4. 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:
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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.
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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
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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.
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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 samples will also be submitted in Barr's EQuIS
format. The water level measurements, EDDs and laboratory reports will be submitted to the City
upon receipt from the lab.
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.
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8.0 References
Barr Engineering, 2009a. Phase II Work Plan, Sites of Concern 1 -3 and 6 -8, 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, 2009c. Supplemental Site Inspection (SOC 4) /Remedial Investigation (SOC 5) Report,
UMore Mining Area, Dakota County, Minnesota.
Barr Engineering, 2009d. Groundwater Assessment Report, Resource Document for Environmental
Impact Statement, UMore Mining Area, Dakota County, Minnesota
Barr Engineering, 2009e. Sampling and Analysis Plan, Phase II Investigation Work Plan, Sites of
Concern 1 -3 and 6 -8, UMore Mining Area, Dakota County, Minnesota.
Barr Engineering, 2010a. Limited Phase 1 Environmental Site Assessment, Ancillary Use Facility (AUF),
UMore Mining Area, Dakota County, Minnesota.
Barr Engineering, 2010b. Technical Memorandum Preliminary Subsurface Investigation Results
Ancillary Use Facility (AUF), UMore Mining Area, Dakota County, Minnesota.
Barr Engineering, 2010c. Predictive Simulations to Assess Potential Effect of Mining Activities on
Groundwater, Resource Document for Environmental Impact Statement, UMore Mining Area,
Dakota County, Minnesota
Minnesota Department of Health, 2010. Letter to Mr. Andrew Brotzler from Stephen W. Robertson,
March 18, 2010.
Minnesota Geological Survey (MGS), 1990. Geologic Atlas, Dakota County, Minnesota.
MGS, 2007. Surficial Geology of the Twin Cities Metropolitan Area, Minnesota.
MGS, 2012. County Well Index, update March 26, 2012.
Mossier J.H., 2008. Paleozoic Stratigraphic Nomenclature for Minnesota. Minnesota Geological Survey
Report of Investigations 65.
Neville, C.J., 2004. MPNEID- Analytical Solution for One Dimensional Solute Transport with
Multiprocess Nonequilibrium, Ver. 4.1, S.S. Papadopulos Associates, Inc.
Peer, 2006. Phase I Environmental Site Assessment, UMore Park, Rosemount, Minnesota, Prepared for
the University of Minnesota by Peer Environmental and Engineering Resources, Inc.
ProSource Technologies, Inc., 2008. Geological Assessment, UMore Park, Rosemount and Empire
Township, Minnesota.
\barr.com \projects \Mpls \23 MN \19\23191101 Dakota Aggregates UMA PermittiAWorkFiles \GW Monitoring PlanADakota Agg UMA GWMP 35
Final 083012.doc
USEPA, 2007. EPA On -line Tools for Site Assessment Calculation: Effective Solubility Calculator,
http: /www.epa.gov /athens/learn2model/part-twolonsite/es.htm
\barr.comAprojects\Mpls \23 MN \19 \23191101 Dakota Aggregates UMA PennittiAWorkFiles \GW Monitoring Plan \Dakota Agg UMA GWMP 36
Final 083012.doc
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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
WeII 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 \Tables \Table 3 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 DW /GW
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 I
Phosphorus, Total 7723 -14 -0 Water /Liquid 365.1 0.0028 0.010 mg /L I
General Chemistry (Legend)
Alkalinity, Bicarbonate as CaCO3 BALKA Water /Liquid SM 2320 B -97 N/A 20 mg /L
Chloride 16837 -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 I 500 SWDR
Microbiology (Pace)
Total Coliform 1 TCOL Water /Liquid 1 SM 9222 B -97 1 N/A 1 J CFU 1 0 (5) 1 0 (5)
Metals*
Arsenic 7440 -38 -2 Water /Liquid 6010B 1.1 10 ug /L 10 10 MCL
Calcium 7440 -70 -2 Water /Liquid 60108 30 1000 ug /L
Iron 7439 -89-6 Water/Liquid 60108 3.8 50 ug /L 300SDWR
Lead 7439 -92 -1 Water/Liquid 60108 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 6010B 1.6 1000 ug /L
Sodium 7440 -23 -5 Water /Liquid 60106 5.3 1000 ug /L 1
Mecury
Mercury 1 74 :9 -97 -6 i Water /Liquid 1 7470A 0.000037 I 0.00020 1 mg/L 1 2 I I 2 MCL
Semi volatile
2,4- dinitrotoluene 121 -14 -2 Water /Liquid 82700 0.45 10 I ug /L 0.5
2,6- dinitrotoluene 603 -20 -2 Water /Liquid 8270C 0.53 10 1 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 r 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 HRL08 (1) 0.006 HRLO9
Endosulfan 1 959 -98 -8 Water /Liquid 8081A 0.032 0.40 ug /L
Endosulfan II 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 1 0.29 1.0 ug /L 3 0.3 HRL93 I 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 80818 0.027 0.25 ug /L 1 HRL93 1 HRL93
4,4' -DDT 50-29 -3 Water /Liquid 80818 0.030 0.25 ug/L HRL93 1 HRL93
a- Chlordane 5103 -71 -9 Water /Liquid 8081B 0.027 0.25 ug /L
Aldrin 309 -00-2 Water /Liquid 80818 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 HRL09
Endosulfan I 959 -98 -8 Water /Liquid 808113 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 80818 0.029 0.25 ug /L
Endrin 72 -20-8 _Water /Liquid 8081B 0.027 0.25 ug /L 2 2 H8V97
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 80818 0.028 0.25 ug /L 0.2 0.2 HBV97
gamma Chlordane 5566 -34 -7 Water/Liquid 80818 0.027 0.25 ug/L 2 2 MCL
Heptachlor 76 -44 -8 Water/Liquid 80818 0.033 0.25 ug/L 0.4 0.08 HRL93 0.08 HRL93
Heptachlor epoxide 1024 -57 -3 Water/Liquid 80818 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 I 80818 1.0 I 5.0 ug/L 3 0.3 HRL93 1 0.3 HRL93
\barr.com\projects \Mpls\23 MN \19\23191101 Dakota Aggregates UMA Permitti \WorkFiles \GW Monitoring Plan \Tables \Table 4 SAP Legend 8.20- 12_criteria 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 Meth, .l MN MOH Human MPCA
unless noted Detect, n Reporting EPA Health -Based Value DWIGW
Parameter CAS Number Matrix otherwise) Lima. Limit Test Unit MCLs Guidance Table Summary Table
MDA List 1 Pesticides (Braun)
EPTC 759 -94 -4 Water /Liquid 1 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 55233-68-6 Water /Liquid 82700 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 6270D 0.12 0.50 ug/L 3 (6) 3 HRLMCL 3 MCL
Propazine 139-40-2 Water/Liquid 8270 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 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 HRLO8 (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 82700 0.15 0.50 ug /L 20 HBV95
Pendimethalin 40487 -42 -1 Water /Liquid 8270D 0.079 0.50 ug /L 90 HBV95
MDA Liet 2 Pesticides (Braun)
Dicamba 1918 Water/Liquid 82700 0.16 0.50 ug/L 200 HRL93 200 HRL93
M.P.C.A. 94-74-6 Water/Liquid 82700 0.13 0.30 ug/L 3 HRL93 3 HRL93
2.4-0 94 -75-7 Water/Liquid 82700 0.22 0.50 ug/L 70 70 HRL93 70 HRL93
J
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 82700 0.13 0.50 ug/L 50 50 HRLMCL 50 HRL09 /MCL
2,4,5 -T 93 -76-5 Water /Liquid 82700 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 1 82606 0.29 i 1.0 ug /L 70 HRL93 70 HRL93
1,1,1- Trichloroethane 71 -55-6 Water /Liquid 8260B 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 8260B 0.25 1.0 ug /L 200000 HRL93 200000 HRL93
1,1- Dichloroethane 75 -34 -3 Water /Liquid 8260B 0.15 1.0 ug /L 100 RAA09 (1) 100 RAA09
1,1- Dichloroethene 75-35-4 Water/Liquid 8260B 0.24 1.0 ug /L 7 200 HRL11 (1) 200 HBV09
1,1- Dichloropropene 563-58-6 Water /Liquid 8260B 0.14 1.0 ug /L
1,2,3- Trichlorobenzene 87 -61-6 Water/Liquid 8260B 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
1,2,4- 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 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 8260B 0.16 1.0 ug /L
1,4- Dichlorobenzene 106 -46 -7 Water /Liquid 8260B 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 8260B 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 82608 3.8 20 ug /L 4000 HRL11 (1) 4000 HBV10
Altyt 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 82608 0.082 I 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 82608 0.23 1.0 ug/L 80 (2) 6 HRL93 6 HRL93 (4)
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 82608 0.32 5.0 ug/L 10 HRL93 10 HRL93
Carbon tetrachloride 56 -23-5 Water/Liquid 82608 0.15 1.0 ug/L 5 1 HBV12 (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 8260B 0.27 1 2.5 ug /L NgBAgQ9a,„ RAA08 (3)
\barr.com projects \Mpls\23 MN \19123191101 Dakota Aggregates UMA Pennitti \WorkFiles \GW Monitoring Plan\Tables \Table 4 SAP Legend 8- 20- 12_criteria 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 6; Water /Liquid 8260B 0 15 1.0 ug /L 80 (2) 30 HRLO8 (1) 30 HRLO9 (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 HRLO8 (1) 50 HRLO9
cis- 1,3- Dichloropropene 10061 -01 -5 Water/Liquid 82608 0.18 1.0 ug /L 2 DCP ISM
Dibromochloromethane 124 -48-1 Water /Liquid 82608 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 106 -38 -3 Water /Liquid 82608 0.57 2.0 ug /L
106-42-3 300 XYL HRL11 (1)
Methyl isobutyl ketone 108 -10 -1 Water /Liquid 8260B 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 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 8260B 0.094 1.0 ug /L
o-Xylene 95-47-6 Water /Liquid 8260B 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 82608 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 HRLO9
Tetrahydrofuran 109 -99-9 Water/Liquid 82608 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
Triohloroethene 79 -01-6 Water /Liquid 82608 0.18 1.0 ug /L 5 5 HRLMCL 5 HRLO9
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 HRLO8 (1) 0.2 HRLO9
Diesel Range Organics
Diesel Range Organics (C10 -C28) I DRO 1 Water /Liquid 1 WI DRC 1 20 I 100 I ug /L I 1 200 HBV99 (11)
Notes:
Surface water samples will be compared to groundwater standards and will be field filtered and analyzed for dissolved metal constituents
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 ccliform must be analyzed for either fecal coliforms or E. coli if two consecutive TC- positive samples, and one is also positive for E.co /i
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 DW /GW Summary Table
(2) While a HRL was promulgated for this chem'.cal, 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 THM5 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.com projects \Mpls\23 MN \19\23191101 Dakota Aggregates UMA Permitti\WorkFiles \GW Monitoring Plan \Tables \Table 4 SAP_Legend 8- 20- 12_criteria DRAFT. XIS 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 Bicarb. Alk.= 14 days;
CaCO TDS Cool to 6 C, plastic (1000 ml) 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 Permitti \WorkFiles \GW Monitoring
Plan \Tables \Table 5 Sample Preservation and Holding Times.doc
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Q UMore Park Boundary SITE LOCATION
Hydrogeologic Study and
Water Monitoring Plan
UMore Mining Area
0 3,000 6,000 12,000 Rosemount, MN
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Q UMore Park Boundary
L 1 Site of Concem (SOC) Boundary Figure 2
L _I Ancillary Use Facility Boundary SITE MAP
SOC AUF LOCATIONS
SOC1 Former Railroad "Y" N 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
SOC Feet
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Source: Dakota County, Bart, James R. Hill, HKGi.
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O OVERVIEW OF MINING ACTIVITIES
1 Underwater Mining Area N Hydrogeologic Study and
Water Monitoring Plan
UMore Mining Area
0 450 900 1,800 Rosemount, MN
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Q UMore Park Boundary O WELLS WITHIN 300 FEET OF PERMIT AREA
Permit Area 300' Buffer N Hydrogeologic Study and
Water Monitoring Plan
e}3 Wells (County Well Index) UMore Mining Area
A Existing Well; Monitoring Well Lc:ation Rosemount, MN
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II Prosource Boring (PDC) 0 25.1 -30 POST MINING DISTANCE BETWEEN
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Barr Well/Boring (STP) MN 80.1 120 Feet UMore Mining Area
A CWI Well (PDC) Ill >120 Rosemount, MN
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Feet
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ROSEMOUNT
DRY MINING PHASE 7 ISUB -PHASE ROSEMOUNT DRY MINING
PHASE 8
i
SUB -PHASE 7
SUB -PHASE 8A SUB -PHASE 86 SUB -PHASE 8C
SUB -F f ;SE 5B 13.82A'cres 14 70Acres 11 40 Acres
9.13 Acres
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5 56 Acres 1620 Acres 9:99 ores
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18.05 Acres ..cv rilligli'M
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z 9.67 Acres
"SUB =PHASE 10A SUB PHASES I
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N ROSEMOUNT SUB PHASE x Y
DRY /WET MINING 5A(DRY) I 1
PHASE 5 SUB- PHASE I
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24.89 Acres I
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1 SUB -PHASE SUB -PHASE SUB PHASE SUB PHASE
4B(DRY) 318(DRY) 2B(DRY) 18(DRY)
SUB -PHASE SUB -PHASE SUB -PHASE
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SUB-PHASE
2BB(WET) 1 BB(WET)'
,,i 16.31 Acres 16.26 Acres 18.21 Acres
-..�k 17.90 Acres
4 ROSEMOUNT
ROSEMOUNT DRY /WET MINING
2 DRY /WET MINING ROSEMOUNT ROSEMOUNT PHASE 1
a PHASE 4 DRY /WET MINING DRY /WET MINING
PHASE 3 PHASE 2
(;SUB -PHASE SUB -PHASE SUB -PHASE SUB -PHASE
4A(DRY) 3A(DRY) 2A(DRY) 1A(DRY)
SUB -PHASE SUB -PHASE SUB -PHASE SUB -PHASE
z, a gryw 4AA(WET) 3AA(WET) 2AA(WET)
x 1AA(WET)
15:48 Acres 1551 Acres 17 -.03 Acres'
25T32 e s°
E
Figure 18
i _D UMore Mining Area (UMA) O SURFACE WATER MONITORING LOCATIONS
Q UMore Park Boundary
Hydrogeologic Study and
Water Monitoring Plan
Surface Water Sample Location UMore Mining Area
I Underwater Mining Area 0 200 400 800 Rosemount, MN
Feet
BARR
Excerpt of the August 28 Planning Commission Meeting Minutes
Public Hearing:
6.a. Request by Dakota Aggregates for a Large Scale Mineral Extraction Permit, Annual
Operating Permit for Dry/Wet Mining Sub -Phase 1A; and an Interim Use Permit for
Aggregate Processing (12- 17 -ME, 12-18-ME, 12-19-IUP). Senior Planner Zweber reviewed the
staff report and stated 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. He further stated that
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
tonight's meeting and the meeting on the 11th.
Applicant, Shawn Dahl, of Dakota Aggregates and Ames Construction stated that Dakota
Aggregates was created by Gemstone and Ames Construction and has been involved with the
UMore property for the past four years. Mr. Dahl further stated they have held public meetings for
the Bloomfield and Enclave neighborhoods and the most common question asked would be why
this particular area was chosen for mining. Mr. Dahl stated that the area is very unique in the
quantity as well as quality of aggregates.
Commissioner Demuth asked Mr. Dahl why Dakota Aggregates wouldn't mine the whole dry area
before continuing to the wet phase below the water table. Mr. Zweber responded saying the
direction came from City staff to mine only 80 dry acres at a time to limit the amounts of dust from
such a large area being mined.
Commissioner DiNella asked Mr. Dahl if Dakota Aggregates has leased or purchased the land and
who receives the profits from the operation. Mr. Dahl stated that they have a lease with the
University and they pay them a market rate for the aggregate on a per ton removed basis.
Chairperson Powell confirmed with staff that the property will become taxable property once the
mining begins and that also the City would hopefully have a nearby source for aggregate when
bidding projects that would be beneficial to the City.
Commissioner Husain stated he had three concerns: water contamination; dust and environmental
pollution; and noise. With respect to the noise concerns, Mr. Dahl stated that the work will take
place 70 feet below the level of County Road 42 and the entire site will be bermed. He stated
Dakota Aggregates is required to operate within MPCA noise standards. With respect to dust
control, Mr. Dahl stated they are only allowed to have 80 acres open at one time and processing is
dust free because they wash 90% of the products produced. He stated the greatest generator of dust
is stockpiles and with only 80 acres open, they will not have enough space to stockpile. Mr. Dahl
also stated they will always have a water truck on site for dust control while mining the 80 acre area.
Chairperson Powell confirmed the condition that if the wind level is too high constituting a wind
advisory day, the Community Development Director has the ability to cease operations until the
wind has decreased.
Commissioner Demuth stated the property has been used for agricultural research and citizens have
expressed their concerns. She asked Mr. Dahl where the public could go to find out which
pesticides have been used in that area. Mr. Dahl stated that the University has performed research
and reports on those concerns that can be made public. Mr. Zweber stated that staff has not seen
any records of pesticides being used but can consult with the University. Jim Aiken, with Barr
Engineering, approached the Commission and stated that during the Phase I and II investigations, it
was found that the University used standard pesticides in accordance with their labeled use and there
was no record of any other experimental use. He stated he can provide more specific information
on that part of the investigation before next month's meeting.
Chairperson Powell stated key issues include protection of the ground water and geology of the lake
and requested a brief presentation from staff on those issues. Mr. Zweber stated that Barr
Engineering is currently improving their groundwater monitoring plan and staff will have that ready
for the September 11 work session meeting.
Commissioner Demuth stated that it states in the packet the Department of Health has concerns if
the surface water impacted the municipal wells, it could be an added expense to our community and
she asked if there was a way to identify the contaminants to look for to possibly prevent an impact.
Mr. Zweber responded that staff has met with LBG and the Department of Health to review the
definitions of groundwater under the influence of surface water and what chemistry parameters we
should look for in the monitoring wells before doing a test well. He stated this is currently a topic
being reviewed and staff will continue to meet with the Department of Health staff to insure the
correct chemistry is being tested for. He stated that the three proposed City drinking water wells
have not been installed and there are other options if it is determined that installing the wells would
be detrimental affected by the groundwater feed lake.
Commissioner Demuth then asked if the intention for the lake is for it to be an amenity to the
public such as a park or public access lake. Mr. Zweber stated that it is intended for the lake to have
public access similar to Cobblestone Lake in Apple Valley.
Chairperson Powell asked for identification of where the Met Council interceptors are running
through the site. Mr. Zweber showed on the aerial diagram where the former interceptor and
current Empire interceptor is located and stated that the mining will take place outside of the
easement containing the Empire interceptor but that Dakota Aggregates would need to abandon the
former interceptor before they would be able to mine in that area.
The public hearing was opened at 7:32p.m.
Myron Napper, 3381 145 Street East, stated he thought all of the questions the Commissioners
were asking could be answered in a 380 page document he received from the County. He asked
staff how far Phase 2 is from the four ordnance stacks and stated that area is contaminated with
chloroform that will deposit into the lake. Mr. Zweber responded that the Phase 2 area is about a
miles from the stacks and that the ground water flows northeast away from the lake, not west. Mr.
Zweber further stated his assumption that the 380 page document from the County is actually his
371 page staff report for this meeting.
Richard Cook, 14665 Biscayne Way, stated he has two concerns: the additional traffic and who
would pay for the installation of reinforced roads at the access points; and who would be in charge
of maintaining the lake once the mining in that phase is complete.
Frank Knoll, 4322 145 Street East, asked how the lake will be filled once mining is complete and
stated the areas north of County Road 42 do not have any water in them. Mr. Zweber replied that
those are stormwater ponds that are fed by whatever precipitation is received. The lake created by
the mining process will be fed by groundwater.
Myron Napper, 3381 145 Street East, expressed his frustration with the inadequacy of the
infrastructure at County Road 42 and 46 intersections with Highway 52 and stated there will be a
need for signals with the additional truck traffic.
Chairperson Powell asked staff to clarify the agency responsibility of maintaining certain roads. Mr.
Zweber stated that Dakota Aggregates will pave into their accesses 150 feet from the right of way.
Akron Avenue south of County Road 42 is a University owned road so there will not be any cost to
the City to maintain that road. He stated that Biscayne Avenue already has a 10 ton standard due to
being an access road for the business park and the City would maintain that road. The cost of a
future street light at Biscayne Avenue and County Road 42 will be shared as well as future
improvement of Biscayne. Mr. Zweber further stated that the lake will be University property until
it's developed and then would be a City park when development occurs.
Lawrence Kane, 2387 145 Street West, asked if the tree line will be used for a trucking road and
expressed his frustration with the current increase in truck traffic along 145`" Street in front of his
home due to the inability for trucks to be able to take a right hand turn onto Highway 3 from
County Road 42. Mr. Zweber stated the former railroad bed along the tree line will be used as a
haul route. As for the truck traffic along 145` Street, Mr. Zweber stated the City wouldn't be able to
ban truck traffic due to Greif Bros. being located there, but agreed with Chairperson Powell who
stated that enforcement can be brought to police attention. Chairperson Powell also suggested
conducting a traffic count to measure before and after the mining operation begins.
Carl Johnson, 14918 Bittersweet Court, stated that in the area where he lives, he has seen at least
two major accidents occurring around the corner and he expressed his concern with having
additional truck traffic going around that corner to the Biscayne Avenue access point.
MOTION by Powell to continue the public hearing to the September 25, 2012, Planning
Commission meeting.
Second by Demuth.
Ayes: 5. Nays: None. Motion approved. Public hearing was continued at 8:03p.m.
Mr. Zweber stated he will compile the information from this meeting for the work session on
September 11, 2012, for further discussion.
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Received
AUG 2 3 2012
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
t
City of Rosemount
Planning Commission
2875 145 St. W 41.
Rosemount, MN 55068
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,
Shaun Nelson
14388 Bentley Way
Rosemount, MN 55068
C74444
C O U N T Y
August 28, 2012
Physical Development Division City of Rosemount
Lynn Thompson, Director Planning Commission
Dakota County 2875 145 Street West
Western Service Center Rosemount, MN 55068
14955 Galaxie Avenue
Apple Valley, MN 55124 -8579
952.891.7000
Fax 952.891.7031 Mr. John Powell, Chair:
www.dakotacounty.us
Environmental Mgmt. Department This letter is in regards to the public hearing to receive public comment on the
Office of GIS applications submitted by Dakota Aggregates, LLC, for a large scale mineral
Parks and Open Space Department
Surveyor's Office extraction permit and an interim use permit to allow mining and aggregate
Transit Office processing on property located within UMore Park.
Transportation Department
Water Resources Department
Dakota County has identified County Highway 42 and County Highway 46 as
proposed 10 -ton highways in our Dakota County 2030 Transportation Plan.
Dakota County will work with the City of Rosemount in upcoming years to
implement these highways as 10 -ton highways. In the meantime, these
highways are 9 -ton highways and all trucks transporting aggregate as part of
this large scale mineral extraction permit must meet the 9 -ton per axle weight
limit.
Please contact Gordon McConnell, Right of Way Permits Manager, at 952-
891 -7115 regarding the necessary permits for this future activity.
Please contact Scott Peters, Senior Transportation Planner, at 952 -891 -7027
regarding any additional questions regarding the County's comments.
Sincerely,
Brian en on
Dakota County
Assistant County Engineer
Cc: Gordon McConnell c r
Scott Peters AUG 3 `i 201/
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