Loading...
HomeMy WebLinkAbout6.b. PCExSum_Hawkins_10252022 EXECUTIVE SUMMARY Planning Commission Meeting Date: October 25, 2022 Tentative City Council Meeting Date: November 15, 2022 AGENDA ITEM: 22-81-SP Request by Hawkins, Inc. for approval of a site plan review related to AGENDA SECTION: the construction of two additions onto Public Hearing the existing manufacturing and warehouse building onsite. AGENDA NO. PREPARED BY: Julia Hogan, Planner 6.b. ATTACHMENTS: Site Map; Survey; Demolition Plan; APPROVED BY: AK Paving Plan Grading Plan; Erosion Control Plan; Utility Plan; Architectural Drawings; Engineering Memo Dated October 17, 2022; Stormwater Review Dated October 17, 2022 RECOMMENDED ACTION: Motion to approve the site plan and building design review for Hawkins, Inc., to allow the construction of two additions totaling 47,000 square feet onto the existing manufacturing and warehouse building on site, subject to the following conditions: 1. Conformance with all conditions of the City Engineer as outlined in the memo dated October 17, 2022, including compliance with the stormwater review memo. 2. Work with staff to meet the parking stall requirement prior to City Council approval. 3. Conformance with the standards of the existing Planned Unit Development associated with the property. SUMMARY Applicant & Property Owner: Hawkins, Inc. Location: 13005 Courthouse Blvd Site Area in Acres: 27.86 Acres Surrounding Land Uses: North: HI – Heavy Industrial/GI – General Industrial East: GI – General Industrial South: GI – General Industrial West: HI – Heavy Industrial/GI – General Industrial Existing Zoning District: HI – Heavy Industrial Comprehensive Plan Desig.: HI – Heavy Industrial The Planning Commission is being asked to conduct a site plan and building design review for Hawkins, Inc. to allow for the construction of two additions totaling 47,000 square feet onto the existing manufacturing and warehouse building onsite at 13005 Courthouse Blvd in eastern Rosemount. Hawkins, Inc. is a chemical company that produces dilutes, and/or repackages chemicals including acids and bases, and the proposed site improvements will not result in any changes to the current operations within the facility, and will instead provide additional space that was originally planned back when the planned unit development final site and building plan for the property was approved by the City Council in 2011. Staff is recommending approval of the request subject to the conditions of approval listed in this report. BACKGROUND In 2011, Hawkins, Inc., had purchased land from CNR that is approximately 25 acres in size to construct a 62,640 square foot building to manufacture and warehouse chemicals. The site is approximately 800 feet deep and 1,400 feet wide and is located between the MN Highway 52 and Highway 55 split. The site then included CNR office and lab buildings, parking lot area, and the northern site access. All other CNR structures on the site were proposed to be demolished except for one 44-foot diameter and 34-foot-tall cylinder tank that was relocated to the tank farm area on the central portion of the site. A Planned Unit Development was approved with the site design and building plan for the site to allow for decreased setbacks on the south and east property lines. The lot split for the property was exempt from City review by State law because it resulted in industrial parcels of over 5 acres. Therefore, setbacks to existing structures could not be addressed during the plat. The south property line is the railroad tracks and the east property is shared with the now Origin to Destination, LLC, a similar heavy industrial use. Because of the two adjoining uses, staff at the time did not find there would be any adverse impact in reducing the south and east setbacks to 75 feet for all structures under 250 feet tall. The proposed additions as well as a future building to the east were planned for future development as part of the final site and building plan that was approved by City Council. The reason for the need for an additional site plan and building design review for the two additions is because they exceed thirty (30) percent of the floor area of the existing building. ISSUE Site Layout The site design that was approved back in 2011 had the site configured into three sections. The most western portion is the location of the existing 63,019 square foot building on site. The building has a truck dock on the south side of the building and an indoor truck loading bay to the east. The access road was designed for one-way traffic with trucks traveling east between the building and the railroad tracks, to the north along the east side of the building, and to the west between the building and MN Highway 55. The center section of the site was approved to be the tank farm with the installation of twenty-one (21) 12 diameter tanks 37 feet tall, and the relocation of an existing 42-foot diameter by 34-foot-tall tank. The tanks are supplied by overhead pipe form the rail line and then serve the building through over had pipes into the truck loading bay. The tank farm was designed for expansion to serve a future second building in the eastern third of the property. Two buildings that were located in the most western part of the site were torn down in 2022. One addition is proposed to be located on the north side of the existing building on site and the second addition is proposed to be located on the western portion of the building. The proposed 2 additions are located within an existing drainage area and extending across a drive isle. The applicant plans on removing existing bituminous pavement and concrete pavement just north of the existing building for one of the proposed additions. Building Design and Materials The north addition is an 85-foot deep by 270-foot wide section that is 35 feet tall and will house additional warehousing space. The western addition is a 200-foot deep by 119-foot wide section that is 35 feet tall and will also house additional warehousing space. The western addition will also contain four (4) indoor truck loading bays located in the most southern portion of the addition. Currently there are 5 indoor truck loading bays directly to the east of this proposed addition. Facing north along Highway 55, the northern addition to the existing building will be constructed of prefinished metal cap flashing and will contain 13 small windows throughout the addition. This addition will have a similar look to the existing building. The western addition to the existing building, where the truck loading bays are located, consist of concrete double tee wall panels and exposed aggregate tan precast concrete wall panels with 4-foot high smooth white accent stripe and will also contain 12 additional small windows. This addition will also blend in with the existing building façade. Landscaping and Tree Preservation This property prior to Hawkins obtaining it was generally devoid of any trees or landscaping aside from some trees within the MN Highway 55 right-of-way and near the previous CNR office building onsite. In 2011, when the planned unit development final site and building plan were approved, Hawkins submitted a landscape plan for the site. None of the then existing vegetation was proposed to be removed. Additional landscaping was required for the site dependent on the total development area. At the time of the original approval Hawkins proposed a development area of 650 feet wide by 650 feet deep, resulting in a development area of 422,500 square feet which included the area for the two proposed additions. The City Code requires one (1) tree per 3,000 feet of development and one (1) foundation plant per linear feet of building perimeter. The City allows industrial buildings to replace four (4) foundation plants with one (1) tree resulting in 28 trees in place of the 113 foundation plants for a total requirement of 169 trees. The City Code requires that trees are a minimum of 2 caliper inches in size and count every two feet in height of a conifer as one caliper inch of a deciduous tree. Based on those standards, Hawkins was responsible with the original approval for 338 caliper inches of trees. The updated landscape plan showed eighty-five (85) eight (8) foot tall white pine trees screening the tank, which is equivalent to 340 caliper inches of trees. The trees that are now planted on site are predominately on the north and west portions of the property where they provide screening for the existing manufacturing and warehouse building and as well as the tank farm. Staff was supportive of the landscape plan that was approved in 2011. Access and Parking Access to the site is from the existing parking lot and northern access to Highway 52 frontage road. The interior access road is asphalt pavement with a flat concrete curb. The City Code requires a curb to prevent asphalt from breaking off if an errant truck drives off the access aisle so for that reason Hawkins agreed back during the initial approval of the site to provide a barrier (B612) curb at all curves greater than 45 degrees, at the loading docks, and at the rail storage. Hawkins proposed to provide eleven (11) parking stalls for the existing building on site along with 3 nineteen (19) “proof of parking” stalls associated with the interior access road, and forty-one (41) parking stalls within the existing parking lot by the old CNR office building. This parking plan fulfilled the forty-nine (49) required parking stalls that was required for the existing building on site at the time, but with the additional 47,000 square foot additions additional parking is required. The two additions will be used for warehousing which for that building use the parking stall requirement is 1 stall per 2,000 square feet. That totals twenty-four (24) additional parking stalls needed. Hawkins had provided a total of seventy-one (71) parking stalls with both actual parking stalls and proof of parking which totaled out to be twenty-two (22) stalls over the amount required. This means that the site would be two (2) parking stall short of the requirement. Staff will work with the applicant to address this shortfall. Utilities In 2011, when the original Planned Unit Development final site and building plan was approved Hawkins proposed to hook onto the existing twelve-inch water line along the frontage road and MN Highway 55 and into the sanitary sewer line along US Highway 52. It was recommended that Hawkins work with the City Engineer to ensure that the sanitary sewer line could be extended to the east to serve Feed Products as well. They proposed originally that the stormwater system would employ ponds, swales, and infiltration basins that would be fed via overland sheet flow. A condition was required that the applicant provide modeling to ensure the system would be compliant and would revise any plans accordingly. With the proposed additions no sanitary sewer or water service improvements are identified for the project. Relocated storm sewer adjacent to the westerly building addition and roof drainage pipes from each addition are proposed to be constructed. These systems connect to existing private storm sewer or discharge to the existing pond on site. Comments included in both the City Engineering Memorandum and the Surface Water Management Plan Review shall be incorporated into the project design. CONCLUSION AND RECOMMENDATION Staff recommends approval of the site plan and building design review for Hawkins, Inc., to allow for the construction of two additions totaling 47,000 square feet onto the existing manufacturing and warehouse building on its property at 13005 Courthouse Blvd in eastern Rosemount. This recommendation is based on the plan submitted by the applicant, the findings made in this report, and the conditions outlined in the recommended actions section above. 4 DescriptionRev.Date HA W K I N S B U I L D I N G AD D I T I O N RO S E M O U N T , M N Sheet: Sheet Title: Project #: Drawn By: Checked By: Issue Date: 92220056.000 GLD MAM 09.27.22 10 0 1 O f f i c e P a r k R d , S u i t e 1 2 0 We s t D e s M o i n e s , I A 5 0 2 6 5 51 5 . 2 2 5 . 4 3 7 7 ww w . l a r s o n e n g r . c o m C 2 0 2 2 L a r s o n E n g i n e e r i n g , I n c . A l l r i g h t s r e s e r v e d . I:\Projects\Projects - 2022\92220056 - Hawkins - Rosemount Expansion\C. Design\Drawing Files\92220056 - C0 - Title Sheet.dwg La r s o n En g i n e e r i n g , I n c . Pr o j e c t T i t l e : HA W K I N S , I N C . 13 0 0 5 C O U R T H O U S E B L V D . RO S E M O U N T , M N 5 5 0 6 8 Cl i e n t : Date: Reg. No.: I hereby certify that this plan, specifications or report was prepared by me or under my direct supervision and that I am a duly licensed Professional Engineer under the laws of the state of Minnesota. TITLE SHEET T PROJECT: HAWKINS ADDITION HAWKINS, INC. 2381 ROSEGATE ROSEVILLE, MN 55113 VICINITY MAP INDEX OF DRAWINGS PROJECT CONTACTS T C0 C1.1 C1.1 C2 C3.1 C3.2 C3.3 C3.4 C4.1 C4.2 C5.1 C5.2 Title Sheet Topographic Survey Demolition Plan - West Demolition Plan - East Paving Plan Grading Plan - West Grading Plan - East Erosions Control Plan - West Erosions Control Plan - East Utility Plan - West Utility Plan - East Civil Details Civil Details Civil Engineer: Michael A. Murphy, P.E. Larson Engineering, Inc. 1001 Office Park Road, Suite 120 West Des Moines, IA 50265-2509 Tel: 515-225-4377 Hawkins, Inc. 13005 Courthouse Blvd. Rosemount, MN 55068 CALL BEFORE YOU DIG! TWIN CITY AREA: TOLL FREE:1-800-252-1166 651-454-0002 Gopher State One Call Owner's Representative: Drew Scott, PMP Hawkins, Inc. 13005 Courthouse Blvd. Rosemount, MN 55068 Tel: 651-437-3556 LEGAL DESCRIPTION That part of the North Half of Section 19, Township 115, Range 18, and the South Half of Section 18, Township 115, Range 18, all in Dakota County, Minessota described as follows: Commencing at the Southeast corner of the Northeast Quarter of the Northwest Quarter of said Section 19; thence North, along the North-South center line of said Section 19, to a point of beginning which is 2929.96 feet North of the North right-of-way line of the Chicago and North Western Railway, (said right-of-way line is 200 feet North of the center line of track in place), measured along said North-South center line; thence deflect to the right 26 degrees 24 minutes 10 seconds a distance of 476.29 feet; thence deflect to the left 90 degrees 00 minuttes 00 seconds a distance of 113.17 feet; thence Northeasterly through a point on the North line of said Section 19, said piont being 318.23 feet East of the Northeast corner of the Northeast Quarter of the Northwest Quarter of said Section 19 to a point which is 150 feet Southwesterly from and at right angles to the center line of State Trunk Highway No. 55; thence deflect to the left 90 degrees 00 minutes 00 seconds along a line which is 150 feet Southwesterly from and at right angles to the center line of said State Trunk Highway, a distance of 743.10 feet to the point of beginning; thence continue along siad parallel line a distance of 1269.64 feet, thence deflect to the left 52 degrees 12 minutes 34 seconds along a line which extended southwesterly intersects a point 600 feet north of and 225 feet east of the Southwest corner of said Section 18, a distance of 681.87; thence deflect left 90 degrees 00 minutes 00 seconds, a distance of 478.16; thence deflect left 35 degrees 47 minutes 26 seconds a distance of 1105.15 feet; thence deflect left 90 degrees 00 minutes 00 seconds, a distance of 22.24 feet; thence deflect right 90 degrees 00 minutes 00 seconds, a distance of 175.40 feet; thence deflect left 90 degrees 00 minutes 00 seconds, a distance of 810.50 fee to the point of beginning. NOT TO SCALE TR U N K H I G H W A Y N O . 5 2 CL A Y T O N A V E ST A T E T R U N K H I G H W A Y N O . 5 6 STATE TRUNK HIGHWAY NO. 55 PID#34-01900-12-040 CONTACT: DREW SCOTT HAWKINS, INC. 2381 ROSEGATE ROSEVILLE, MN 55113 TEL:612.617.8595 EMAIL:drew.scott@ hawkinsinc.com THE UNDERGROUND UTILITIES SHOWN HAVE BEEN LOCATED FROM FIELD SURVEY INFORMATION AND EXISTING DRAWINGS. THE SURVEYOR MAKES NO GUARANTEE THAT THE UNDERGROUND UTILITIES SHOWN COMPRISE ALL SUCH UTILITIES IN THE AREA, EITHER IN SERVICE OR ABANDONED. THE SURVEYOR FURTHER DOES NOT WARRANT THAT THE UNDERGROUND UTILITIES SHOWN ARE IN THE EXACT LOCATION INDICATED ALTHOUGH HE DOES CERTIFY THAT THEY ARE LOCATED AS ACCURATELY AS POSSIBLE FROM THE INFORMATION AVAILABLE. THIS SURVEY HAS NOT PHYSICALLY LOCATED THE UNDERGROUND UTILITIES. ADDITIONAL UTILITIES OF WHICH WE ARE UNAWARE MAY EXIST. COUNTY/CITY: REVISIONS: PROJECT LOCATION: DATE REVISION 13005 CALL BEFORE YOU DIG! TWIN CITY AREA:TOLL FREE:1-800-252-1166651-454-0002 Gopher State One Call COURTHOUSE BLVD. 1. BEARINGS ARE BASED ON COORDINATES SUPPLIED BY THE DAKOTA COUNTY SURVEYORS OFFICE. 2. UNDERGROUND UTILITIES SHOWN PER VISIBLE UTILITIES, PREVIOUS SURVEYS, ENGINEERING PLANS AND UTILITY LOCATES FOR ENGINEERING DESIGN. 3. THERE MAY SOME UNDERGROUND UTILITIES, GAS, ELECTRIC, ETC. NOT SHOWN OR LOCATED. 4. ALL BOUNDARY AND EASEMENT INFORMATION PER ALTA SURVEY BY MFRA DATED 06/29/2011 AND SHOWN FOR GRAPHICAL PURPOSES ONLY. NO FIELD WORK DONE TO VERIFY BOUNARY. SURVEY NOTES: CITY OF ROSEMOUNT DAKOTA COUNTY 09-19-2022 INITIAL ISSUE CERTIFICATION: I hereby certify that this plan was prepared by me, or under my direct supervision, and that I am a duly Licensed Land Surveyor under the laws of the state of Minnesota. Daniel L. Thurmes Registration Number: 25718 Date:__________________ HAWKINS, INC. ROSEMOUNT HAW22003 SURVHAW2.DWG TOPOGRAPHIC SURVEY LAND SURVEYING, INC. CORNERSTONE Suite #200 1970 Northwestern Ave Stillwater, MN 55082 Phone 651.275.8969 Fax 651.275.8976 dan@ cssurvey .net PROJECT NO. FILE NAME 09-19-2022 SHEET 1 OF 3 SHEETS UNDERGROUND ELECTRIC UNDERGROUND CABLE TV UNDERGROUND FIBER OPTIC UNDERGROUND TELEPHONE OVERHEAD UTILITY UNDERGROUND GAS SANITARY SEWER STORM SEWER WATERMAIN FENCE CURB [TYPICAL] CONTOURS FOUND MONUMENT SET 1/2" IRON PIPE MARKED RLS NO. 25718 CABLE TV PEDESTAL AIR CONDITIONER ELECTRIC MANHOLE ELECTRIC METER ELECTRIC PEDESTAL ELECTRIC TRANSFORMER LIGHT POLE GUY WIRE POWER POLE GAS MANHOLE GAS METER TELEPHONE MANHOLE TELEPHONE PEDESTAL SANITARY CLEANOUT SANITARY MANHOLE CATCH BASIN STORM DRAIN FLARED END SECTION STORM MANHOLE FIRE DEPT. CONNECTION HYDRANT CURB STOP WATER WELL WATER MANHOLE WATER METER POST INDICATOR VALVE WATER VALVE BOLLARD FLAG POLE MAIL BOX TRAFFIC SIGN UNKNOWN MANHOLE SOIL BORING SPOT ELEVATION TRAFFIC SIGNAL CONIFEROUS TREE DECIDUOUS TREE LEGEND THIS DESCRIPTION AND ALL BOUNDARY/TITLE ELEMENTS OF THIS SURVEY ARE TAKEN FROM AN ALTA SURVEY BY MFRA DATED 06/29/2011. BOUNDARY INFORMATION IS SHOWN FOR GRAPHICAL PURPOSES ONLY. NO FIELD WORK DONE TO VERIFY BOUNARY. That part of the North Half of Section 19, Township 115, Range 18, and the South Half of Section 18, Township 115, Range 18, all in Dakota County, Minnesota described as follows: Commencing at the Southeast corner of the Northeast Quarter of the Northwest Quarter of said Section 19; thence North, along the North-South center line of said Section 19, to a point of beginning which is 2929.96 feet North of the North right-of-way line of the Chicago and North Western Railway,(said right-of-way line is 200 feet North of the center line of track in place), measured along said North-South center line; thence deflect to the right 26 degrees 24 minutes 10 seconds a distance of 476.29 feet; thence deflect to the left 90 degrees 00 minutes 00 seconds a distance of 113.17 feet; thence Northeasterly through a point on the North line of said Section 19, said point being 318.23 feet East of the Northeast corner of the Northeast Quarter of the Northwest Quarter of said Section 19 to a point which is 150 feet Southwesterly from and at right angles to the center line of State Trunk Highway No. 55; thence deflect to the left 90 degrees 00 minutes 00 seconds along a line which is 150 feet Southwesterly from and at right angles to the center line of said State Trunk Highway, a distance of 743.10 feet to the point of beginning; thence continue along said parallel line a distance of 1269.64 feet; thence deflect to the left 52 degrees 12 minutes 34 seconds along a line which extended southwesterly intersects a point 600 feet north of and 225 feet east of the Southwest corner of said Section 18, a distance of 681.87 feet; thence deflect left 90 degrees 00 minutes 00 seconds, a distance of 478.16 feet; thence deflect left 35 degrees 47 minutes 26 seconds a distance of 1105.15 feet; thence deflect left 90 degrees 00 minutes 00 seconds, a distance of 22.24 feet; thence deflect right 90 degrees 00 minutes 00 seconds, a distance of 175.40 feet; thence deflect left 90 degrees 00 minutes 00 seconds, a distance of 810.50 feet to the point of beginning. ELEVATIONS BASED ON INFORMATION AS SHOWN ON THE MNDOT GEODETIC WEBSITE. SURVEY DISK 1910 N WITH AN ELEVATION OF 890.29 WAS USED TO ESTABLISH VERTICAL CONTROL FOR THIS SURVEY (NGVD29). NGVD29 DATUM WAS USED TO CORRELATE WITH PREVIOUS SURVEYS AND ENGINEERING PLANS PREPARED FOR THIS SITE. PROJECT BENCHMARKS SHOWN GRAPHICALLY. BENCHMARKS: UNDERGROUND UTILITY NOTES: LEGAL DESCRIPTION: THIS DESCRIPTION AND ALL BOUNDARY/TITLE ELEMENTS OF THIS SURVEY ARE TAKEN FROM AN ALTA SURVEY BY MFRA DATED 06/29/2011. NO ADDITIONAL BOUNDARY WORK WAS CONDUCTED FOR THIS SURVEY. Easement for highway purposes, together with the right of access to Trunk Highway 55 from that portion of subject premises lying Easterly of the East line of the Southwest Quarter of the Southwest Quarter of Section 18, in favor of State of Minnesota, as created in document dated May 1, 1958, filed June 27, 1958, in Book 70 of Misc., Page 128. The right of access line described in the easement is shown on the Survey. Easement for pipeline purposes, in favor of Koch Refining Company, a Delaware corporation, its successors and assigns, as created in document dated May 11, 1972, filed May 30, 1972, as Document No. 399280. Amended by Amendment of Easement dated April 4, 1974, filed May 1, 1974, as Document No. 432801. Further amended by Second Amendment and restatement of Easement dated December 31, 1980, filed December 31, 1985, as Document No. 573949. The easement is shown on the Survey. Easement for pipeline purposes, in favor of Koch Refining Company, a Delaware corporation, as created in document dated August 20, 1993, filed September 10, 1993, as Document No. 1153754. Corrective Easement dated November 4, 1993, filed December 9, 1993, as Document No, 173632. The easement is shown on the Survey Easement for watermain purposes, in favor of the City of Rosemount, a Minnesota municipal corporation, as created in document dated November 20, 2001, filed November 20, 2001, as Document No. 1832260. The easement is shown on the Survey. Terms and conditions of and easement for rail purposes as contained in Agreement Regarding Railroad Spur and Switchtrack Mutual Easement and Agreement dated December 13, 2010, filed December 17, 2010, as Document No. 2773155. The Easement is shown on the Survey. Terms and conditions of and access easement for pedestrian and vehicular ingress and egress purposes as contained in Access Easement Agreement dated December 13, 2010, filed December 17, 2010, as Document No. 2773154. The Easement is shown on the Survey. LEGAL DESCRIPTION/TITLE NOTES: 0 NORTH 80 160 SE E S H E E T 2 OF 3 S H E E T S SE E S H E E T 3 OF 3 S H E E T S AL L B O U N D A R Y A N D E A S E M E N T IN F O R M A T I O N P E R A L T A S U R V E Y BY M F R A D A T E D 0 6 / 2 9 / 2 0 1 1 AN D S H O W N F O R G R A P H I C A L PU R P O S E S O N L Y . N O F I E L D W O R K DO N E T O V E R I F Y B O U N A R Y . TR U N K H I G H W A Y N O . 5 2 CL A Y T O N A V E ST A T E T R U N K H I G H W A Y N O . 5 6 STATE TRUNK HIGHWAY NO. 55 PID#34-01900-12-040 CONTACT: DREW SCOTT HAWKINS, INC. 2381 ROSEGATE ROSEVILLE, MN 55113 TEL:612.617.8595 EMAIL:drew.scott@ hawkinsinc.com THE UNDERGROUND UTILITIES SHOWN HAVE BEEN LOCATED FROM FIELD SURVEY INFORMATION AND EXISTING DRAWINGS. THE SURVEYOR MAKES NO GUARANTEE THAT THE UNDERGROUND UTILITIES SHOWN COMPRISE ALL SUCH UTILITIES IN THE AREA, EITHER IN SERVICE OR ABANDONED. THE SURVEYOR FURTHER DOES NOT WARRANT THAT THE UNDERGROUND UTILITIES SHOWN ARE IN THE EXACT LOCATION INDICATED ALTHOUGH HE DOES CERTIFY THAT THEY ARE LOCATED AS ACCURATELY AS POSSIBLE FROM THE INFORMATION AVAILABLE. THIS SURVEY HAS NOT PHYSICALLY LOCATED THE UNDERGROUND UTILITIES. ADDITIONAL UTILITIES OF WHICH WE ARE UNAWARE MAY EXIST. COUNTY/CITY: REVISIONS: PROJECT LOCATION: DATE REVISION 13005 CALL BEFORE YOU DIG! TWIN CITY AREA:TOLL FREE:1-800-252-1166651-454-0002 Gopher State One Call COURTHOUSE BLVD. 1. BEARINGS ARE BASED ON COORDINATES SUPPLIED BY THE DAKOTA COUNTY SURVEYORS OFFICE. 2. UNDERGROUND UTILITIES SHOWN PER VISIBLE UTILITIES, PREVIOUS SURVEYS, ENGINEERING PLANS AND UTILITY LOCATES FOR ENGINEERING DESIGN. 3. THERE MAY SOME UNDERGROUND UTILITIES, GAS, ELECTRIC, ETC. NOT SHOWN OR LOCATED. SURVEY NOTES: CITY OF ROSEMOUNT DAKOTA COUNTY 09-19-2022 INITIAL ISSUE CERTIFICATION: I hereby certify that this plan was prepared by me, or under my direct supervision, and that I am a duly Licensed Land Surveyor under the laws of the state of Minnesota. Daniel L. Thurmes Registration Number: 25718 Date:__________________ HAWKINS, INC. ROSEMOUNT 0 NORTH 50 100 HAW22003 SURVHAW2.DWG TOPOGRAPHIC SURVEY LAND SURVEYING, INC. CORNERSTONE Suite #200 1970 Northwestern Ave Stillwater, MN 55082 Phone 651.275.8969 Fax 651.275.8976 dan@ cssurvey .net PROJECT NO. FILE NAME 09-19-2022 SHEET 2 OF 3 SHEETS UNDERGROUND ELECTRIC UNDERGROUND CABLE TV UNDERGROUND FIBER OPTIC UNDERGROUND TELEPHONE OVERHEAD UTILITY UNDERGROUND GAS SANITARY SEWER STORM SEWER WATERMAIN FENCE CURB [TYPICAL] CONTOURS FOUND MONUMENT SET 1/2" IRON PIPE MARKED RLS NO. 25718 CABLE TV PEDESTAL AIR CONDITIONER ELECTRIC MANHOLE ELECTRIC METER ELECTRIC PEDESTAL ELECTRIC TRANSFORMER LIGHT POLE GUY WIRE POWER POLE GAS MANHOLE GAS METER TELEPHONE MANHOLE TELEPHONE PEDESTAL SANITARY CLEANOUT SANITARY MANHOLE CATCH BASIN STORM DRAIN FLARED END SECTION STORM MANHOLE FIRE DEPT. CONNECTION HYDRANT CURB STOP WATER WELL WATER MANHOLE WATER METER POST INDICATOR VALVE WATER VALVE BOLLARD FLAG POLE MAIL BOX TRAFFIC SIGN UNKNOWN MANHOLE SOIL BORING SPOT ELEVATION TRAFFIC SIGNAL CONIFEROUS TREE DECIDUOUS TREE LEGEND LEGAL DESCRIPTION/TITLE NOTES: SEE SHEET 1 OF 3 SHEETS FOR LEGAL DESCRIPTION AND BOUNDARY INFORMATION. ALL BOUNDARY/TITLE ELEMENTS OF THIS SURVEY ARE TAKEN FROM AN ALTA SURVEY BY MFRA DATED 06/29/2011 AND ARE SHOWN FOR GRAPHICAL PURPOSES ONLY. NO ADDITIONAL BOUNDARY WORK WAS CONDUCTED FOR THIS SURVEY. BOUNDARY MONUMENTS SHOWN AS FOUND WERE PHYSICALLY LOCATED WHILE CONDUCTING THIS TOPOGRAPHIC SURVEY. NO FIELD WORK DONE TO VERIFY BOUNARY. ELEVATIONS BASED ON INFORMATION AS SHOWN ON THE MNDOT GEODETIC WEBSITE. SURVEY DISK 1910 N WITH AN ELEVATION OF 890.29 WAS USED TO ESTABLISH VERTICAL CONTROL FOR THIS SURVEY (NGVD29). NGVD29 DATUM WAS USED TO CORRELATE WITH PREVIOUS SURVEYS AND ENGINEERING PLANS PREPARED FOR THIS SITE. PROJECT BENCHMARKS SHOWN GRAPHICALLY. BENCHMARKS: UNDERGROUND UTILITY NOTES: STATE TRUNK HIGHWAY NO. 55 PID#34-01900-12-040 CONTACT: DREW SCOTT HAWKINS, INC. 2381 ROSEGATE ROSEVILLE, MN 55113 TEL:612.617.8595 EMAIL:drew.scott@ hawkinsinc.com THE UNDERGROUND UTILITIES SHOWN HAVE BEEN LOCATED FROM FIELD SURVEY INFORMATION AND EXISTING DRAWINGS. THE SURVEYOR MAKES NO GUARANTEE THAT THE UNDERGROUND UTILITIES SHOWN COMPRISE ALL SUCH UTILITIES IN THE AREA, EITHER IN SERVICE OR ABANDONED. THE SURVEYOR FURTHER DOES NOT WARRANT THAT THE UNDERGROUND UTILITIES SHOWN ARE IN THE EXACT LOCATION INDICATED ALTHOUGH HE DOES CERTIFY THAT THEY ARE LOCATED AS ACCURATELY AS POSSIBLE FROM THE INFORMATION AVAILABLE. THIS SURVEY HAS NOT PHYSICALLY LOCATED THE UNDERGROUND UTILITIES. ADDITIONAL UTILITIES OF WHICH WE ARE UNAWARE MAY EXIST. COUNTY/CITY: REVISIONS: PROJECT LOCATION: DATE REVISION 13005 CALL BEFORE YOU DIG! TWIN CITY AREA:TOLL FREE:1-800-252-1166651-454-0002 Gopher State One Call COURTHOUSE BLVD. 1. BEARINGS ARE BASED ON COORDINATES SUPPLIED BY THE DAKOTA COUNTY SURVEYORS OFFICE. 2. UNDERGROUND UTILITIES SHOWN PER VISIBLE UTILITIES, PREVIOUS SURVEYS, ENGINEERING PLANS AND UTILITY LOCATES FOR ENGINEERING DESIGN. 3. THERE MAY SOME UNDERGROUND UTILITIES, GAS, ELECTRIC, ETC. NOT SHOWN OR LOCATED. SURVEY NOTES: CITY OF ROSEMOUNT DAKOTA COUNTY 09-19-2022 INITIAL ISSUE CERTIFICATION: I hereby certify that this plan was prepared by me, or under my direct supervision, and that I am a duly Licensed Land Surveyor under the laws of the state of Minnesota. Daniel L. Thurmes Registration Number: 25718 Date:__________________ HAWKINS, INC. ROSEMOUNT 0 NORTH 50 100 HAW22003 SURVHAW2.DWG TOPOGRAPHIC SURVEY LAND SURVEYING, INC. CORNERSTONE Suite #200 1970 Northwestern Ave Stillwater, MN 55082 Phone 651.275.8969 Fax 651.275.8976 dan@ cssurvey .net PROJECT NO. FILE NAME 09-19-2022 SHEET 3 OF 3 SHEETS UNDERGROUND ELECTRIC UNDERGROUND CABLE TV UNDERGROUND FIBER OPTIC UNDERGROUND TELEPHONE OVERHEAD UTILITY UNDERGROUND GAS SANITARY SEWER STORM SEWER WATERMAIN FENCE CURB [TYPICAL] CONTOURS FOUND MONUMENT SET 1/2" IRON PIPE MARKED RLS NO. 25718 CABLE TV PEDESTAL AIR CONDITIONER ELECTRIC MANHOLE ELECTRIC METER ELECTRIC PEDESTAL ELECTRIC TRANSFORMER LIGHT POLE GUY WIRE POWER POLE GAS MANHOLE GAS METER TELEPHONE MANHOLE TELEPHONE PEDESTAL SANITARY CLEANOUT SANITARY MANHOLE CATCH BASIN STORM DRAIN FLARED END SECTION STORM MANHOLE FIRE DEPT. CONNECTION HYDRANT CURB STOP WATER WELL WATER MANHOLE WATER METER POST INDICATOR VALVE WATER VALVE BOLLARD FLAG POLE MAIL BOX TRAFFIC SIGN UNKNOWN MANHOLE SOIL BORING SPOT ELEVATION TRAFFIC SIGNAL CONIFEROUS TREE DECIDUOUS TREE LEGEND LEGAL DESCRIPTION/TITLE NOTES: SEE SHEET 1 OF 3 SHEETS FOR LEGAL DESCRIPTION AND BOUNDARY INFORMATION. ALL BOUNDARY/TITLE ELEMENTS OF THIS SURVEY ARE TAKEN FROM AN ALTA SURVEY BY MFRA DATED 06/29/2011 AND ARE SHOWN FOR GRAPHICAL PURPOSES ONLY. NO ADDITIONAL BOUNDARY WORK WAS CONDUCTED FOR THIS SURVEY. BOUNDARY MONUMENTS SHOWN AS FOUND WERE PHYSICALLY LOCATED WHILE CONDUCTING THIS TOPOGRAPHIC SURVEY. NO FIELD WORK DONE TO VERIFY BOUNARY. ELEVATIONS BASED ON INFORMATION AS SHOWN ON THE MNDOT GEODETIC WEBSITE. SURVEY DISK 1910 N WITH AN ELEVATION OF 890.29 WAS USED TO ESTABLISH VERTICAL CONTROL FOR THIS SURVEY (NGVD29). NGVD29 DATUM WAS USED TO CORRELATE WITH PREVIOUS SURVEYS AND ENGINEERING PLANS PREPARED FOR THIS SITE. PROJECT BENCHMARKS SHOWN GRAPHICALLY. BENCHMARKS: UNDERGROUND UTILITY NOTES: PIN E B E N D T R A I L 1 1 2 2 2 3 4 12 5 MA T C H L I N E MA T C H L I N E DescriptionRev.Date HA W K I N S B U I L D I N G AD D I T I O N RO S E M O U N T , M N Sheet: Sheet Title: Project #: Drawn By: Checked By: Issue Date: 92220056.000 GLD MAM 09.27.22 10 0 1 O f f i c e P a r k R d , S u i t e 1 2 0 We s t D e s M o i n e s , I A 5 0 2 6 5 51 5 . 2 2 5 . 4 3 7 7 ww w . l a r s o n e n g r . c o m C 2 0 2 2 L a r s o n E n g i n e e r i n g , I n c . A l l r i g h t s r e s e r v e d . I:\Projects\Projects - 2022\92220056 - Hawkins - Rosemount Expansion\C. Design\Drawing Files\92220056 - C1 - Demolition Plan.dwg La r s o n En g i n e e r i n g , I n c . Pr o j e c t T i t l e : HA W K I N S , I N C . 13 0 0 5 C O U R T H O U S E B L V D . RO S E M O U N T , M N 5 5 0 6 8 Cl i e n t : Date: Reg. No.: I hereby certify that this plan, specifications or report was prepared by me or under my direct supervision and that I am a duly licensed Professional Engineer under the laws of the state of Minnesota. REMOVE AND DISPOSE OF EXISTING BITUMINOUS PAVEMENT SECTION REMOVE AND DISPOSE OF EXISTING CONCRETE PAVEMENT SECTION SYMBOL LEGEND REMOVE AND DISPOSE OF EXISTING UTILITY STRUCTURE.. REMOVE AND DISPOSE OF EXISTING UTILITY LINE. REMOVE AND DISPOSE OF EXISTING FENCE. REMOVE AND DISPOSE OF EXISTING CURB. REMOVE AND SALVAGE EXISTING GRAVEL/RIP RAP. 1 2 DEMOLITION PLAN - WEST C1.1 KEY NOTES DEMOLITION NOTES 1.Verify all existing utility locations. 2.It is the responsibility of the Contractor to perform or coordinate all necessary utility demolitions and relocations from existing utility locations to all onsite amenities and buildings. These connections include, but are not limited to, water, sanitary sewer, cable tv, telephone, gas, electric, site lighting, etc. 3.Prior to beginning work, contact Gopher State Onecall (651-454-0002) to locate utilities throughout the area under construction. The Contractor shall retain the services of a private utility locator to locate the private utilities. 4.Sawcut along edges of pavements, sidewalks, and curbs to remain. 5.All construction shall be performed in accordance with state and local standard specifications for construction. 0 NORTH 20 40 80 3 4 5 12'CED 6"ELM 12"ELM 6"POP 13"POP 4"ELM 1 12 2 MA T C H L I N E MA T C H L I N E DescriptionRev.Date HA W K I N S B U I L D I N G AD D I T I O N RO S E M O U N T , M N Sheet: Sheet Title: Project #: Drawn By: Checked By: Issue Date: 92220056.000 GLD MAM 09.27.22 10 0 1 O f f i c e P a r k R d , S u i t e 1 2 0 We s t D e s M o i n e s , I A 5 0 2 6 5 51 5 . 2 2 5 . 4 3 7 7 ww w . l a r s o n e n g r . c o m C 2 0 2 2 L a r s o n E n g i n e e r i n g , I n c . A l l r i g h t s r e s e r v e d . I:\Projects\Projects - 2022\92220056 - Hawkins - Rosemount Expansion\C. Design\Drawing Files\92220056 - C1 - Demolition Plan.dwg La r s o n En g i n e e r i n g , I n c . Pr o j e c t T i t l e : HA W K I N S , I N C . 13 0 0 5 C O U R T H O U S E B L V D . RO S E M O U N T , M N 5 5 0 6 8 Cl i e n t : Date: Reg. No.: I hereby certify that this plan, specifications or report was prepared by me or under my direct supervision and that I am a duly licensed Professional Engineer under the laws of the state of Minnesota. REMOVE AND DISPOSE OF EXISTING BITUMINOUS PAVEMENT SECTION REMOVE AND DISPOSE OF EXISTING CONCRETE PAVEMENT SECTION SYMBOL LEGEND DEMOLITION PLAN - EAST C1.1 DEMOLITION NOTES 1.Verify all existing utility locations. 2.It is the responsibility of the Contractor to perform or coordinate all necessary utility demolitions and relocations from existing utility locations to all onsite amenities and buildings. These connections include, but are not limited to, water, sanitary sewer, cable tv, telephone, gas, electric, site lighting, etc. 3.Prior to beginning work, contact Gopher State Onecall (651-454-0002) to locate utilities throughout the area under construction. The Contractor shall retain the services of a private utility locator to locate the private utilities. 4.Sawcut along edges of pavements, sidewalks, and curbs to remain. 5.All construction shall be performed in accordance with state and local standard specifications for construction. 0 NORTH 20 40 80 REMOVE AND DISPOSE OF EXISTING UTILITY STRUCTURE.. REMOVE AND DISPOSE OF EXISTING UTILITY LINE. REMOVE AND DISPOSE OF EXISTING FENCE. REMOVE AND DISPOSE OF EXISTING CURB. REMOVE AND SALVAGE EXISTING GRAVEL/RIP RAP. 1 2 KEY NOTES 3 4 5 PIN E B E N D T R A I L PROPOSED BUILDING ADDITION FFE = 917.00 PROPOSED BUILDING ADDITION FFE = 917.00 56 ' 20 ' 14 ' 5' 2' 135 ° ' 28. 4 9 ' 18 ' DescriptionRev.Date HA W K I N S B U I L D I N G AD D I T I O N RO S E M O U N T , M N Sheet: Sheet Title: Project #: Drawn By: Checked By: Issue Date: 92220056.000 GLD MAM 09.27.22 10 0 1 O f f i c e P a r k R d , S u i t e 1 2 0 We s t D e s M o i n e s , I A 5 0 2 6 5 51 5 . 2 2 5 . 4 3 7 7 ww w . l a r s o n e n g r . c o m C 2 0 2 2 L a r s o n E n g i n e e r i n g , I n c . A l l r i g h t s r e s e r v e d . I:\Projects\Projects - 2022\92220056 - Hawkins - Rosemount Expansion\C. Design\Drawing Files\92220056 - C2 - Paving Plan.dwg La r s o n En g i n e e r i n g , I n c . Pr o j e c t T i t l e : HA W K I N S , I N C . 13 0 0 5 C O U R T H O U S E B L V D . RO S E M O U N T , M N 5 5 0 6 8 Cl i e n t : Date: Reg. No.: I hereby certify that this plan, specifications or report was prepared by me or under my direct supervision and that I am a duly licensed Professional Engineer under the laws of the state of Minnesota. NEW 6" BITUMINOUS PAVEMENT OVER NEW 8" CRUSHED AGGREGATE BASE. NEW 3" BITUMINOUS PAVEMENT OVER NEW 8" BASE AGGREGATE. NEW 4" CONCRETE PAVEMENT OVER 6" BASE AGGREGATE. NEW 8" CONCRETE OVER 6" BASE AGGREGATE BASE. SYMBOL LEGEND WHERE APPLICABLE, DIMENSIONS ARE FROM BACK OF CURB TO BACK OF CURB OR BACK OF CURB TO END OF STALL LINE. PAVING PLAN C2 0 NORTH 20 40 80 PROPOSED BUILDING ADDITION FFE = 917.00 PROPOSED BUILDING ADDITION FFE = 917.00 913.00 913.00 913.00 916.00 916.50 916.50 915 916.50 916.42 914 91 4 91 5 91 6 9 0 9 9 1 2 912 91 1 91 0 917.00 917.00 916.50 916.76 917.00 SEDIMENTATION BASIN NWL = 912.00 HWL = 913.69 DEAD POOL VOLUME = 53,559 CF PIN E B E N D T R A I L MA T C H L I N E MA T C H L I N E DescriptionRev.Date HA W K I N S B U I L D I N G AD D I T I O N RO S E M O U N T , M N Sheet: Sheet Title: Project #: Drawn By: Checked By: Issue Date: 92220056.000 GLD MAM 09.27.22 10 0 1 O f f i c e P a r k R d , S u i t e 1 2 0 We s t D e s M o i n e s , I A 5 0 2 6 5 51 5 . 2 2 5 . 4 3 7 7 ww w . l a r s o n e n g r . c o m C 2 0 2 2 L a r s o n E n g i n e e r i n g , I n c . A l l r i g h t s r e s e r v e d . I:\Projects\Projects - 2022\92220056 - Hawkins - Rosemount Expansion\C. Design\Drawing Files\92220056 - C3 - Grading Plan.dwg La r s o n En g i n e e r i n g , I n c . Pr o j e c t T i t l e : HA W K I N S , I N C . 13 0 0 5 C O U R T H O U S E B L V D . RO S E M O U N T , M N 5 5 0 6 8 Cl i e n t : Date: Reg. No.: I hereby certify that this plan, specifications or report was prepared by me or under my direct supervision and that I am a duly licensed Professional Engineer under the laws of the state of Minnesota. GRADING PLAN - WEST C3.1 PROPOSED CONTOURS - MAJOR INTERVAL GRADE BREAK LINE PROPOSED CONTOURS - MINOR INTERVAL949 950 950 EXISTING CONTOURS 2.0% 950.00 TC 949.50 GL GRADE SLOPE SPOT ABBREVIATIONS: TC - TOP OF CURB GL - GUTTER LINE B - BITUMUNOUS C - CONCRETE EO - EMERGENCY OVERFLOW TW - TOP OF WALL BW - BOTTOM OF WALL (F/G) (*) - EXISTING TO BE VERIFIED LEGEND GRADING NOTES 1.Tree protection consisting of snow fence or safety fence installed at the drip line shall be in place prior to beginning any grading or demolition work at the site. 2.All elevations with an asterisk (*) shall be field verified. If elevations vary significantly, notify the Engineer for further instructions. 3.Grades shown in paved areas represent finish elevation. 4.Restore all disturbed areas with 4” of good quality topsoil and seed. 5.The grading contractor shall retin a soils engineer to verify fill material in accordance with the specifications. 6.All construction shall be performed in accordance with state and local standard specifications for construction. 0 NORTH 20 40 80 900 905 910 913 SED I M E N T A T I O N B A S I N NWL = 9 0 2 . 3 4 HWL = 9 0 6 . 7 5 12'CED 6"ELM 12"ELM 6"POP 13"POP 4"ELM MA T C H L I N E MA T C H L I N E DescriptionRev.Date HA W K I N S B U I L D I N G AD D I T I O N RO S E M O U N T , M N Sheet: Sheet Title: Project #: Drawn By: Checked By: Issue Date: 92220056.000 GLD MAM 09.27.22 10 0 1 O f f i c e P a r k R d , S u i t e 1 2 0 We s t D e s M o i n e s , I A 5 0 2 6 5 51 5 . 2 2 5 . 4 3 7 7 ww w . l a r s o n e n g r . c o m C 2 0 2 2 L a r s o n E n g i n e e r i n g , I n c . A l l r i g h t s r e s e r v e d . I:\Projects\Projects - 2022\92220056 - Hawkins - Rosemount Expansion\C. Design\Drawing Files\92220056 - C3 - Grading Plan.dwg La r s o n En g i n e e r i n g , I n c . Pr o j e c t T i t l e : HA W K I N S , I N C . 13 0 0 5 C O U R T H O U S E B L V D . RO S E M O U N T , M N 5 5 0 6 8 Cl i e n t : Date: Reg. No.: I hereby certify that this plan, specifications or report was prepared by me or under my direct supervision and that I am a duly licensed Professional Engineer under the laws of the state of Minnesota. GRADING PLAN - EAST C3.2 PROPOSED CONTOURS - MAJOR INTERVAL GRADE BREAK LINE PROPOSED CONTOURS - MINOR INTERVAL949 950 950 EXISTING CONTOURS 2.0% 950.00 TC 949.50 GL GRADE SLOPE SPOT ABBREVIATIONS: TC - TOP OF CURB GL - GUTTER LINE B - BITUMUNOUS C - CONCRETE EO - EMERGENCY OVERFLOW TW - TOP OF WALL BW - BOTTOM OF WALL (F/G) (*) - EXISTING TO BE VERIFIED LEGEND GRADING NOTES 1.Tree protection consisting of snow fence or safety fence installed at the drip line shall be in place prior to beginning any grading or demolition work at the site. 2.All elevations with an asterisk (*) shall be field verified. If elevations vary significantly, notify the Engineer for further instructions. 3.Grades shown in paved areas represent finish elevation. 4.Restore all disturbed areas with 4” of good quality topsoil and seed. 5.The grading contractor shall retin a soils engineer to verify fill material in accordance with the specifications. 6.All construction shall be performed in accordance with state and local standard specifications for construction. 0 NORTH 20 40 80 PROPOSED BUILDING ADDITION FFE = 917.00 PROPOSED BUILDING ADDITION FFE = 917.00 915914 91 4 91 5 91 6 9 0 9 9 1 2 912 91 1 91 0 SEDIMENTATION BASIN NWL = 912.00 HWL = 913.69 DEAD POOL VOLUME = 53,559 CF PIN E B E N D T R A I L MA T C H L I N E MA T C H L I N E DescriptionRev.Date HA W K I N S B U I L D I N G AD D I T I O N RO S E M O U N T , M N Sheet: Sheet Title: Project #: Drawn By: Checked By: Issue Date: 92220056.000 GLD MAM 09.27.22 10 0 1 O f f i c e P a r k R d , S u i t e 1 2 0 We s t D e s M o i n e s , I A 5 0 2 6 5 51 5 . 2 2 5 . 4 3 7 7 ww w . l a r s o n e n g r . c o m C 2 0 2 2 L a r s o n E n g i n e e r i n g , I n c . A l l r i g h t s r e s e r v e d . I:\Projects\Projects - 2022\92220056 - Hawkins - Rosemount Expansion\C. Design\Drawing Files\92220056 - C3 - Grading Plan.dwg La r s o n En g i n e e r i n g , I n c . Pr o j e c t T i t l e : HA W K I N S , I N C . 13 0 0 5 C O U R T H O U S E B L V D . RO S E M O U N T , M N 5 5 0 6 8 Cl i e n t : Date: Reg. No.: I hereby certify that this plan, specifications or report was prepared by me or under my direct supervision and that I am a duly licensed Professional Engineer under the laws of the state of Minnesota. EROSION CONTROL PLAN - WEST C3.3 PROPOSED CONTOURS - MAJOR INTERVAL GRADE BREAK LINE PROPOSED CONTOURS - MINOR INTERVAL949 950 950 EXISTING CONTOURS 2.0%GRADE SLOPE SILT FENCE RIP-RAP / ROCK CONST. ENTRANCE INLET PROTECTION - FLEXSTORM CATCH IT OR APPROVED EQUAL CONCRETE WASHOUT STATION LEGEND 1.Owner and Contractor shall obtain MPCA-NPDES permit. Contractor shall be responsible for all fees pertaining to this permit. The SWPPP shall be kept onsite at all times. 2.Install temporary erosion control measures (inlet protection, silt fence, and rock construction entrances) prior to beginning any excavation or demolition work at the site. 3.Erosion control measures shown on the erosion control plan are the absolute minimum. The contractor shall install temporary earth dikes, sediment traps or basins, additional siltation fencing, and/or disk the soil parallel to the contours as deemed necessary to further control erosion. All changes shall be recorded in the SWPPP. 4.All construction site entrances shall be surfaced with crushed rock across the entire width of the entrance and from the entrance to a point 50' into the construction zone. 5.The toe of the silt fence shall be trenched in a minimum of 6”. The trench backfill shall be compacted with a vibratory plate compactor. 6.All grading operations shall be conducted in a manner to minimize the potential for site erosion. Sediment control practices must be established on all down gradient perimeters before any up gradient land disturbing activities begin. 7.All exposed soil areas must be stabilized as soon as possible to limit soil erosion but in no case later than 14 days after the construction activity in that portion of the site has temporarily or permanently ceased. Temporary stockpiles without significant silt, clay or organic components (e.g., clean aggregate stockpiles, demolition concrete stockpiles, sand stockpiles) and the constructed base components of roads, parking lots and similar surfaces are exempt from this requirement. 8.The normal wetted perimeter of any temporary or permanent drainage ditch or swale that drains water from any portion of the construction site, or diverts water around the site, must be stabilized within 200 lineal feet from the property edge, or from the point of discharge into any surface water. Stabilization of the last 200 lineal feet must be completed within 24 hours after connecting to a surface water. Stabilization of the remaining portions of any temporary or permanent ditches or swales must be complete within 14 days after connecting to a surface water and construction in that portion of the ditch has temporarily or permanently ceased. 9.Pipe outlets must be provided with energy dissipation within 24 hours of connection to surface water. 10.All riprap shall be installed with a filter material or soil separation fabric and comply with the Minnesota Department of Transportation Standard Specifications. 11.All storm sewers discharging into wetlands or water bodies shall outlet at or below the normal water level of the respective wetland or water body at an elevation where the downstream slope is 1 percent or flatter. The normal water level shall be the invert elevation of the outlet of the wetland or water body. 12.All storm sewer catch basins not needed for site drainage during construction shall be covered to prevent runoff from entering the storm sewer system. Catch basins necessary for site drainage during construction shall be provided with inlet protection. 13.In areas where concentrated flows occur (such as swales and areas in front of storm catch basins and intakes) the erosion control facilities shall be backed by stabilization structure to protect those facilities from the concentrated flows. 14.Inspect the construction site once every seven days during active construction and within 24 hours after a rainfall event greater than 0.5 inches in 24 hours. All inspections shall be recorded in the SWPPP. 15.All silt fences must be repaired, replaced, or supplemented when they become nonfunctional or the sediment reaches 1/3 of the height of the fence. These repairs must be made within 24 hours of discovery, or as soon as field conditions allow access. All repairs shall be recorded in the SWPPP. 16.If sediment escapes the construction site, off-site accumulations of sediment must be removed in a manner and at a frequency sufficient to minimize off-site impacts. 17.All soils tracked onto pavement shall be removed daily. 18.All infiltration areas must be inspected to ensure that no sediment from ongoing construction activity is reaching the infiltration area and these areas are protected from compaction due to construction equipment driving across the infiltration area. 19.Temporary soil stockpiles must have silt fence or other effective sediment controls, and cannot be placed in surface waters, including stormwater conveyances such as curb and gutter systems, or conduits and ditches unless there is a bypass in place for the stormwater. 20.Collected sediment, asphalt and concrete millings, floating debris, paper, plastic, fabric, construction and demolition debris and other wastes must be disposed of properly and must comply with MPCA disposal requirements. 21.Oil, gasoline, paint and any hazardous substances must be properly stored, including secondary containment, to prevent spills, leaks or other discharge. Restricted access to storage areas must be provided to prevent vandalism. Storage and disposal of hazardous waste must be in compliance with MPCA regulations. 22.External washing of trucks and other construction vehicles must be limited to a defined area of the site. Runoff must be contained and waste properly disposed of. No engine degreasing is allowed onsite. 23.All liquid and solid wastes generated by concrete washout operations must be contained in a leak-proof containment facility or impermeable liner. A compacted clay liner that does not allow washout liquids to enter ground water is considered an impermeable liner. The liquid and solid wastes must not contact the ground, and there must not be runoff from the concrete washout operations or areas. Liquid and solid wastes must be disposed of properly and in compliance with MPCA regulations. A sign must be installed adjacent to each washout facility to inform concrete equipment operators to utilize the proper facilities. EROSION CONTROL NOTES 0 NORTH 20 40 80 24.Upon completion of the project and stabilization of all graded areas, all temporary erosion control facilities (silt fences, hay bales, etc.) shall be removed from the site. 25.All permanent sedimentation basins must be restored to their design condition immediately following stabilization of the site. 26.Contractor shall submit Notice of Termination for MPCA-NPDES permit within 30 days after Final Stabilization. 900 905 910 913 SED I M E N T A T I O N B A S I N NWL = 9 0 2 . 3 4 HWL = 9 0 6 . 7 5 12'CED 6"ELM 12"ELM 6"POP 13"POP 4"ELM MA T C H L I N E MA T C H L I N E DescriptionRev.Date HA W K I N S B U I L D I N G AD D I T I O N RO S E M O U N T , M N Sheet: Sheet Title: Project #: Drawn By: Checked By: Issue Date: 92220056.000 GLD MAM 09.27.22 10 0 1 O f f i c e P a r k R d , S u i t e 1 2 0 We s t D e s M o i n e s , I A 5 0 2 6 5 51 5 . 2 2 5 . 4 3 7 7 ww w . l a r s o n e n g r . c o m C 2 0 2 2 L a r s o n E n g i n e e r i n g , I n c . A l l r i g h t s r e s e r v e d . I:\Projects\Projects - 2022\92220056 - Hawkins - Rosemount Expansion\C. Design\Drawing Files\92220056 - C3 - Grading Plan.dwg La r s o n En g i n e e r i n g , I n c . Pr o j e c t T i t l e : HA W K I N S , I N C . 13 0 0 5 C O U R T H O U S E B L V D . RO S E M O U N T , M N 5 5 0 6 8 Cl i e n t : Date: Reg. No.: I hereby certify that this plan, specifications or report was prepared by me or under my direct supervision and that I am a duly licensed Professional Engineer under the laws of the state of Minnesota. EROSION CONTROL PLAN - EAST C3.4 PROPOSED CONTOURS - MAJOR INTERVAL GRADE BREAK LINE PROPOSED CONTOURS - MINOR INTERVAL949 950 950 EXISTING CONTOURS 2.0%GRADE SLOPE SILT FENCE RIP-RAP / ROCK CONST. ENTRANCE INLET PROTECTION - FLEXSTORM CATCH IT OR APPROVED EQUAL CONCRETE WASHOUT STATION LEGEND 1.See notes on previous sheet. EROSION CONTROL NOTES 0 NORTH 20 40 80 PROPOSED BUILDING ADDITION FFE = 917.00 PROPOSED BUILDING ADDITION FFE = 917.00 SEDIMENTATION BASIN NWL = 912.00 HWL = 913.69 DEAD POOL VOLUME = 53,559 CF PIN E B E N D T R A I L CBMH RIM = 909.67 INV = 904.96 39 LF 15" HDPE @ 0.22% SLOPE 1 0 2 L F 1 2 " H D P E @ 1 . 0 % M I N S L O P E 115 L F 1 2 " H D P E @ 0.3 9 % S L O P E CONNECT 12" HDPE TO BLDG STUB @ 909.50 CONNECT 12" HDPE TO BLDG STUB @ 913.00 CONNECT 12" HDPE TO BLDG STUB @ 913.00 CONNECT 12" HDPE TO BLDG STUB @ 913.00 54 L F 1 2 " H D P E @ 1 . 0 % S L O P E CBMH RIM = 916.50 INV = 912.35 FES INV = 912.50 CBMH RIM = 908.50 INV = 905.50 CBMH RIM = 916.50 INV = 912.50 CBMH RIM = 909.66 INV = 905.05 45 LF 12" HDPE @ 0.33% SLOPE CONNECT TO EXST FES @ INV = 912.62 23 LF 12" HDPE @ 2.17% SLOPE 35 LF 6" DIP EXST HYDRANT FDC EXST HYDRANT EXST HYDRANT TO BE RELOCATED RELOCATED HYDRANT MA T C H L I N E MA T C H L I N E DescriptionRev.Date HA W K I N S B U I L D I N G AD D I T I O N RO S E M O U N T , M N Sheet: Sheet Title: Project #: Drawn By: Checked By: Issue Date: 92220056.000 GLD MAM 09.27.22 10 0 1 O f f i c e P a r k R d , S u i t e 1 2 0 We s t D e s M o i n e s , I A 5 0 2 6 5 51 5 . 2 2 5 . 4 3 7 7 ww w . l a r s o n e n g r . c o m C 2 0 2 2 L a r s o n E n g i n e e r i n g , I n c . A l l r i g h t s r e s e r v e d . I:\Projects\Projects - 2022\92220056 - Hawkins - Rosemount Expansion\C. Design\Drawing Files\92220056 - C4 - Utility Plan.dwg La r s o n En g i n e e r i n g , I n c . Pr o j e c t T i t l e : HA W K I N S , I N C . 13 0 0 5 C O U R T H O U S E B L V D . RO S E M O U N T , M N 5 5 0 6 8 Cl i e n t : Date: Reg. No.: I hereby certify that this plan, specifications or report was prepared by me or under my direct supervision and that I am a duly licensed Professional Engineer under the laws of the state of Minnesota. UTILITY PLAN - WEST C4.1 CABLE UNDERGROUND LINE FIBER OPTIC UNDERGROUND LINE ELECTRIC UNDERGROUND LINE ELECTRIC OVERHEAD LINE TELEPHONE UNDERGROUND LINE STORM SEWER PIPE SANITARY SEWER PIPE NATURAL GAS UNDERGROUND LINE WATERMAIN PIPE LIGHT POLE STORM MANHOLE FLARED END CURB INLET CATCH BASIN WATER SHUTOFF GATE VALVE & BOX HYDRANT SANITARY MANHOLE DRAINTILE PIPE LEGEND UTILITY NOTES 1.It is the responsibility of the contractor to perform or coordinate all necessary utility connections and relocations from existing utility locations to the proposed building, as well as to all onsite amenities. These connections include but are not limited to water, sanitary sewer, cable TV, telephone, gas, electric, site lighting, etc. 2.All service connections shall be performed in accordance with state and local standard specifications for construction. Utility connections (sanitary sewer, watermain, and storm sewer) may require a permit from the City. 3.The contractor shall verify the elevations at proposed connections to existing utilities prior to any demolition or excavation. 4.The contractor shall notify all appropriate engineering departments and utility companies 72 hours prior to construction. All necessary precautions shall be made to avoid damage to existing utilities. 5.Storm sewer requires testing in accordance with Minnesota plumbing code 4714.1109 where located within 10 feet of waterlines or the building. 6.HDPE storm sewer piping shall meet ASTM F2306 and fittings shall meet ASTM D3212 joint pressure test. Installation shall meet ASTM C2321. 7.All RCP pipe shown on the plans shall be MN/DOT class 3. 8.Maintain a minimum of 7 ½' of cover over all water lines and sanitary sewer lines. Where 7 ½' of cover is not provided, install 2” rigid polystyrene insulation (MN/DOT 3760) with a thermal resistance of at least 5 and a compressive strength of at least 25 psi. Insulation shall be 8' wide, centered over pipe with 6” sand cushion between pipe and insulation. Where depth is less than 5', use 4” of insulation. 9.Install water lines 18" above sanitary sewers, where the sanitary sewer crosses over the water line, install sewer piping of materials equal to watermain standards for 9 feet on both sides and maintain 18" of separation. 10.All watermain piping shall be class 52 ductile iron pipe unless noted otherwise. 11.See Project Specifications for bedding requirements. 12.Pressure test and disinfect all new watermains in accordance with state and local requirements. 13.Sanitary sewer piping shall be PVC, SDR-35 for depths less than 12', PVC SDR-26 for depths between 12' and 26', and class 52 D.I.P. for depths of 26' or more. 14.A structure adjustment shall include removing and salvaging the existing casting assembly, removing existing concrete rings to the precast section. Install new rings and salvaged casting to proposed grades, cleaning casting flange by mechanical means to insure a sound surface and install an external chimney seal from casting to precast section. Chimney seals shall be Infi-Shield Uni-Band or an approved equal. 15.All joints and connections in the storm sewer system shall be gas-tight or water-tight. Approved resilient rubber joints must be used to make watertight connections to manholes, catch basins, and other structures. Cement mortar joints are permitted only for repairs and connections of existing lines constructed with such joints. 0 NORTH 20 40 80 SED I M E N T A T I O N B A S I N NWL = 9 0 2 . 3 4 HWL = 9 0 6 . 7 5 12'CED 6"ELM 12"ELM 6"POP 13"POP 4"ELM FES INV = 902.93 FES INV = 902.34 MA T C H L I N E MA T C H L I N E DescriptionRev.Date HA W K I N S B U I L D I N G AD D I T I O N RO S E M O U N T , M N Sheet: Sheet Title: Project #: Drawn By: Checked By: Issue Date: 92220056.000 GLD MAM 09.27.22 10 0 1 O f f i c e P a r k R d , S u i t e 1 2 0 We s t D e s M o i n e s , I A 5 0 2 6 5 51 5 . 2 2 5 . 4 3 7 7 ww w . l a r s o n e n g r . c o m C 2 0 2 2 L a r s o n E n g i n e e r i n g , I n c . A l l r i g h t s r e s e r v e d . I:\Projects\Projects - 2022\92220056 - Hawkins - Rosemount Expansion\C. Design\Drawing Files\92220056 - C4 - Utility Plan.dwg La r s o n En g i n e e r i n g , I n c . Pr o j e c t T i t l e : HA W K I N S , I N C . 13 0 0 5 C O U R T H O U S E B L V D . RO S E M O U N T , M N 5 5 0 6 8 Cl i e n t : Date: Reg. No.: I hereby certify that this plan, specifications or report was prepared by me or under my direct supervision and that I am a duly licensed Professional Engineer under the laws of the state of Minnesota. UTILITY PLAN - EAST C4.2 CABLE UNDERGROUND LINE FIBER OPTIC UNDERGROUND LINE ELECTRIC UNDERGROUND LINE ELECTRIC OVERHEAD LINE TELEPHONE UNDERGROUND LINE STORM SEWER PIPE SANITARY SEWER PIPE NATURAL GAS UNDERGROUND LINE WATERMAIN PIPE LIGHT POLE STORM MANHOLE FLARED END CURB INLET CATCH BASIN WATER SHUTOFF GATE VALVE & BOX HYDRANT SANITARY MANHOLE DRAINTILE PIPE LEGEND UTILITY NOTES 1.It is the responsibility of the contractor to perform or coordinate all necessary utility connections and relocations from existing utility locations to the proposed building, as well as to all onsite amenities. These connections include but are not limited to water, sanitary sewer, cable TV, telephone, gas, electric, site lighting, etc. 2.All service connections shall be performed in accordance with state and local standard specifications for construction. Utility connections (sanitary sewer, watermain, and storm sewer) may require a permit from the City. 3.The contractor shall verify the elevations at proposed connections to existing utilities prior to any demolition or excavation. 4.The contractor shall notify all appropriate engineering departments and utility companies 72 hours prior to construction. All necessary precautions shall be made to avoid damage to existing utilities. 5.Storm sewer requires testing in accordance with Minnesota plumbing code 4714.1109 where located within 10 feet of waterlines or the building. 6.HDPE storm sewer piping shall meet ASTM F2306 and fittings shall meet ASTM D3212 joint pressure test. Installation shall meet ASTM C2321. 7.All RCP pipe shown on the plans shall be MN/DOT class 3. 8.Maintain a minimum of 7 ½' of cover over all water lines and sanitary sewer lines. Where 7 ½' of cover is not provided, install 2” rigid polystyrene insulation (MN/DOT 3760) with a thermal resistance of at least 5 and a compressive strength of at least 25 psi. Insulation shall be 8' wide, centered over pipe with 6” sand cushion between pipe and insulation. Where depth is less than 5', use 4” of insulation. 9.Install water lines 18" above sanitary sewers, where the sanitary sewer crosses over the water line, install sewer piping of materials equal to watermain standards for 9 feet on both sides and maintain 18" of separation. 10.All watermain piping shall be class 52 ductile iron pipe unless noted otherwise. 11.See Project Specifications for bedding requirements. 12.Pressure test and disinfect all new watermains in accordance with state and local requirements. 13.Sanitary sewer piping shall be PVC, SDR-35 for depths less than 12', PVC SDR-26 for depths between 12' and 26', and class 52 D.I.P. for depths of 26' or more. 14.A structure adjustment shall include removing and salvaging the existing casting assembly, removing existing concrete rings to the precast section. Install new rings and salvaged casting to proposed grades, cleaning casting flange by mechanical means to insure a sound surface and install an external chimney seal from casting to precast section. Chimney seals shall be Infi-Shield Uni-Band or an approved equal. 15.All joints and connections in the storm sewer system shall be gas-tight or water-tight. Approved resilient rubber joints must be used to make watertight connections to manholes, catch basins, and other structures. Cement mortar joints are permitted only for repairs and connections of existing lines constructed with such joints. 0 NORTH 20 40 80 A3.0 architects, inc. MEDIN 203 n.w. First Ave. Faribault, MN 55021 507/334-2252PRE L I M I N A R Y NOT F O R CON S T R U C T I O N M: \ D J M e d i n P r o j e c t s \ 2 0 2 2 \ 2 2 - 0 3 7 H a w k i n s A d d i t i o n \ D w g \ 2 2 0 3 7 a 0 3 . 0 . d w g , 9 / 2 1 / 2 0 2 2 1 1 : 0 4 : 3 9 A M , D W G T o P D F . p c 3 A3.1 architects, inc. MEDIN 203 n.w. First Ave. Faribault, MN 55021 507/334-2252PRE L I M I N A R Y NOT F O R CON S T R U C T I O N M: \ D J M e d i n P r o j e c t s \ 2 0 2 2 \ 2 2 - 0 3 7 H a w k i n s A d d i t i o n \ D w g \ 2 2 0 3 7 a 0 3 . 0 . d w g , 9 / 2 1 / 2 0 2 2 1 1 : 0 4 : 4 1 A M , D W G T o P D F . p c 3 A3.2 architects, inc. MEDIN 203 n.w. First Ave. Faribault, MN 55021 507/334-2252PRE L I M I N A R Y NOT F O R CON S T R U C T I O N M: \ D J M e d i n P r o j e c t s \ 2 0 2 2 \ 2 2 - 0 3 7 H a w k i n s A d d i t i o n \ D w g \ 2 2 0 3 7 a 0 3 . 0 . d w g , 9 / 2 1 / 2 0 2 2 1 1 : 0 4 : 4 2 A M , D W G T o P D F . p c 3 A3.3 architects, inc. MEDIN 203 n.w. First Ave. Faribault, MN 55021 507/334-2252PRE L I M I N A R Y NOT F O R CON S T R U C T I O N M: \ D J M e d i n P r o j e c t s \ 2 0 2 2 \ 2 2 - 0 3 7 H a w k i n s A d d i t i o n \ D w g \ 2 2 0 3 7 a 0 3 . 0 . d w g , 9 / 2 1 / 2 0 2 2 1 1 : 0 4 : 4 2 A M , D W G T o P D F . p c 3 EXIT ONLY 1 2 3 4 5DCBAHGFE A5.0 architects, inc. MEDIN 203 n.w. First Ave. Faribault, MN 55021 507/334-2252PRE L I M I N A R Y NOT F O R CON S T R U C T I O N M: \ D J M e d i n P r o j e c t s \ 2 0 2 2 \ 2 2 - 0 3 7 H a w k i n s A d d i t i o n \ D w g \ 2 2 0 3 7 a 0 5 . 0 . d w g , 9 / 2 1 / 2 0 2 2 1 1 : 0 4 : 4 4 A M , D W G T o P D F . p c 3 A6.0 architects, inc. MEDIN 203 n.w. First Ave. Faribault, MN 55021 507/334-2252PRE L I M I N A R Y NOT F O R CON S T R U C T I O N M: \ D J M e d i n P r o j e c t s \ 2 0 2 2 \ 2 2 - 0 3 7 H a w k i n s A d d i t i o n \ D w g \ 2 2 0 3 7 a 0 6 . 0 . d w g , 9 / 2 1 / 2 0 2 2 1 1 : 0 4 : 4 6 A M , D W G T o P D F . p c 3 K:\021076-000\Admin\Docs\2022.09.29 - Submittal\2022.10.12 - Site Plan Review.docx Memorandum To: Anthony Nemcek, Senior Planner CC: Brian Erickson, City Engineer Jane Byron, Stormwater Specialist From: Tim Hanson PE, WSB Engineering Consultant Date: October 12, 2022 Re: Hawkins Addition – (Hawkins, Inc.) Site Plan Review WSB File Number 021076-000 SUBMITTAL: Hawkins, Inc. has submitted a site plan for two building additions to their existing facilities at 13005 Courthouse Boulevard. The plans submitted were prepared by Larson Engineering, Inc. West Des Moines, IA. Review comments were generated from the submittal not dated, received on 09.29.2022. The submittal included the following: ▪ Paving Plan ▪ Grading & Erosion Control Plan ▪ Utility Plan EXISTING CONDITIONS The Hawkins site is located just south of, and between, the State Highway 52 and Highway 55 split. The parent parcel consists of land developed for industrial use with multiple buildings and railroad spurs located on the lot. The parcel is 27.86 acres in size. SITE PLAN The site plan identifies two building additions one on the north side of the existing building and one on the west side. The additions were originally identified with the development of the current structure. The additions are located within an existing drainage area and extending across a drive isle. The proposed site improvements primarily provide for storm water management for the site. GRADING AND DRAINAGE The proposed grading consists of site grading adjacent to the additions, shaping of a shallow swale adjacent to the westerly addition and the construction of a NURP basin near the easterly property boundary. The constructed pond appears to overtop to the south. A defined drainage pattern is not indicated on the plans. SANITARY SEWER AND WATERMAIN – UTILITY PLAN No sanitary sewer or water service improvements are identified in the project. Anthony Nemcek August 16, 2022 Page 2 K:\021076-000\Admin\Docs\2022.09.29 - Submittal\2022.10.12 - Site Plan Review.docx STORM SEWER Relocated storm sewer adjacent to the westerly building addition and roof drainage pipes from each addition are proposed to be constructed. These systems connect to existing private s torm sewer or discharge to the existing pond. SURFACE WATER MANAGEMENT The proposed Surface Water Management plan for the site is under reviewed. Comments included in the Surface Water Management plan review shall be incorporated in the project design. GENERAL Infrastructure design shall be completed in accordance with the City of Rosemount’s Engineering Guidelines and Standards. Infrastructure construction shall be completed in accordance with the latest edition of the City’s General Specifications and Standard Detail Plates for Street and Utility Construction. K:\021076-000\Admin\Docs\Stormwater Review\Hawkins Stormwater Review Memo 10-17-22.docx 7 0 1 X E N I A A V E N U E S | S U I T E 3 0 0 | M I N N E A P O L I S , M N | 55 4 1 6 | 7 6 3 . 5 4 1 . 4 8 0 0 | W S B E N G . C O M Memorandum To: Jane Byron, City of Rosemount From: Bill Alms, PE Henry Meeker, EIT Date: October 17, 2022 Re: Hawkins Site Improvements Stormwater Review WSB Project No. 021076-000 I have reviewed the documents provided by Larson Engineering on October 6, 2022. Documents reviewed include: • Building Plan Set dated 10/6/2022 • HydroCAD Report dated 10/6/2022 • Proposed Drainage Map dated 10/5/2022 • SWPPP dated 10/5/2022 • Geotechnical Report dated 9/23/2022 • Comment Response Letter Dated 10/6/2022 Applicant should provide responses to each comment. Comments from the 10/6/2022 letter are in red and updated review comments are in blue. I offer the following comments below. Grading, Drainage, and Erosion Control Comments: 1. General a. A SWPPP will be required before construction can begin. A draft SWPPP has been provided for review. The provided SWPPP appears to be sufficient. b. An NPDES permit will be required before construction can begin, unless a previous NPDES permit exists and is still valid. A new NPDES permit will be needed and will be obtained by Knutson Construction prior to work beginning on the project. NPDES permit has been provided. c. An operations and maintenance agreement for stormwater facilities is needed. An O&M agreement will be drafted by the Owner and reviewed and approved by the City. Noted, provide when drafted. d. A geotechnical report with infiltration rate testing is recommended. A Report of Geotechnical Explorations prepared by AET and dated September 23, 2022 and a Report of Geotechnical Exploration and Review prepared by AET and dated July 26, 2011 have been provided for review. While infiltration testing was not performed as part of the exploration and testing work, the boring logs included clearly shown sandy soils are found throughout the site and are very Jane Byron 10/17/2022 Page 2 K:\021076-000\Admin\Docs\Stormwater Review\Hawkins Stormwater Review Memo 10-17-22.docx capable to drawdown the existing infiltration basins on -site. This is also evident in the history of pond performance over the past 11 years. Noted, based on geotechnical results it appears the existing soils provide the necessary infiltration capacity. e. If the site is permitted under an industrial stormwater permit, provide the spill emergency response plan. The site is permitted under an industrial stormwater permit and the spill emergency response plan will be shared. Provide spill emergency response plan. f. Provide phasing plan or further clarification of proposed improvements. Based on provided materials and communications, it is unclear what site improvements have already happened, are proposed with this permit application, or are proposed further in the future. A Phasing Plan has not been provided since all proposed work now clearly shown on the Civil Plan Sheets prepared for the Site Plan Application will be completed prior to July 2, 2023. The west warehouse addition is planned for completion just weeks before the north proposed addition. Site restoration will occur last with final stabilization planned for July 2023. Noted. 2. Ponds and Wetlands a. No comments. 3. Emergency Overflow Routes: a. All emergency overflow locations and elevations must be shown for site low points and stormwater basins. EOF locations and elevations have been shown on the Plans. Noted. 4. Retaining Walls: a. No comments. 5. Erosion Control: a. Proposed infiltration basins must have silt fence around the perimeter until site stabilization has been achieved to prevent loss of infiltration capacity. Silt fence has been shown where needed on the Erosion Control Plan. No infiltration basins have been proposed, although the existing basins have been protected with silt fence. Noted, silt fence as shown is sufficient. b. Silt fence is required to capture runoff wherever site construction has positive drainage leaving grading limits. For example, silt fence is needed for the perimeter of the berm on the north side of the site. Silt fence has been shown where needed on the Erosion Control Plan. Site disturbances will only occur within the loop road around the proposed additions and at the proposed sedimentation basin on the east side of the site. Noted. c. Specify final stabilization seeding on plans. Proposed seeding work has been shown on the Erosion Control Plan. Jane Byron 10/17/2022 Page 3 K:\021076-000\Admin\Docs\Stormwater Review\Hawkins Stormwater Review Memo 10-17-22.docx Proposed seeding work does not appear to be shown aside from note on sheets C3.1 and C3.2. 6. Grading: a. Show NWL and HWL for all basins on grading plan sheet, only some sedimentation basins have these shown. The NWL and HWL have been updated on the Grading Plan and in the HydroCAD to reflect the as-built conditions and the proposed for the new sedimentation basin. Noted. Stormwater Management Plan: 1. General Storm Sewer Design a. The minimum allowable storm sewer size is 15” according to City engineering guidelines. Even though a 15” pipe size is well oversized for many of the small sub- catchments proposed, 15” minimum pipe sizes have been provided downstream of catch basins. Noted. b. Catchbasins in unpaved areas are not typically allowable. City staff to approve or deny this variance. A catch basin in the depressed green space south of the west addition is proposed. This catch basin is needed to prevent meltwater from snow removal operations from running over the loop road which acts as the primary vehicular entrance to the site. Noted, this catchbasin is allowable based on needs provided. c. A 3’ sump is required on structures immediately upstream of basin inlets. A 3’ sump has been provided for all proposed catch basins placed upstream of a basin inlet. Noted. d. Confirm no conflicts at storm sewer crossings with other utilities. Provide insulation if storm sewer crosses within 2’ of watermain or sanitary sewer. No utility crossings are being proposed. Noted. e. Pond 13P is modeled with a 6” vertical orifice but is shown with an 18” FES outlet. Reconcile difference between model and plans. f. Pond 14P is modeled with a starting elevation of 902, but the OCS modeled begins at an elevation of 904.1. 2. Water Quantity a. Provide modeling of storm sewer facilities with updated Atlas 14 precipitation for the 2-, 10-, and 100-year 24-hour events. Modeling of the 100-year 10-day snowmelt event is needed as well. A HydroCAD model has been provided for both the storms mentioned below as well as the 100-year, 10-day snowmelt event. The provided HydroCAD report does not include the 2-year 2.8”, 100-year 7.41” or 10-day 7.2” events. Jane Byron 10/17/2022 Page 4 K:\021076-000\Admin\Docs\Stormwater Review\Hawkins Stormwater Review Memo 10-17-22.docx b. Longer timespans are recommended for HydroCAD modeling to fully capture peak flows, especially when modeling the 10-day event. 3. Rate/Volume Control a. Include any offsite drainage in modeling. For example, the drainage map suggests offsite area to the north is considered as tributary area, but this 24S subcatchment is not present in the modeling. The HydroCAD model and Drainage Map have been updated to include site area tributary to the basins and those that bypass treatment to the south. Noted. b. Gravel roads should be counted as impervious with a curve number of 98 in hydrology modeling. The HydroCAD model has been updated to show accurate subcatchments with existing gravel surfaces modeled with a curve number of 98. Subcatchments 28S and 37S still show gravel surface with the CN of 85. c. Outlet control structures with skimmers are required for basins with offsite flows. No basins are proposed for offsite flows. Noted, outlet control structures are not needed as the site proposes to use the excess infiltration capacity in the downstream regional BMP. 4. Freeboard a. The modeled 100-year HWL for basin 9P is 913.07, above the proposed FFE of 913 for the eastern building. The City requires 3’ of freeboard from HWL or 2’ of freeboard and meeting the following requirements: • Provide flood storage volume within the freeboard area that is at least 50% of the flood storage volume below the 100-yr HWL; and • 25% outlet obstruction does not increase the 100-yr HWL by more than 1’; and • Adequate EOF from basin to provide assurance that 1’ freeboard will be maintained for proposed low opening The existing building and proposed additions will have a FFE of 917.00. A minimum of 3’ of freeboard will be provided. The proposed sedimentation basin north of the building expansion has a HWL of 914.45, within 3’ of the building FFE of 917.0. 5. Water Quality a. The City requires infiltration capacity such that 1/12 of an acre-foot/acre/day is achieved for the entire site’s acreage. Based on a site area of 28.03 acres, this infiltration area is 1.46 acres. The proposed infiltration area is 0.82 acres, meaning there is an infiltration area deficit of 0.64 acres. i. This deficit can be accounted for with excess infiltration capacity in the downstream regional basin constructed with the ATS site improvements. In reviewing the Stormwater Summary for the ATS Site Improvements excess volume is available for the Hawkins’ site runoff volume. Noted. b. While NURP dead pool storage is provided onsite, the required NURP dead storage of runoff from a 2.5” storm over the tributary drainage area must be calculated for each basin to ensure design standards are met. A HydroCAD model for the 2.5” event has been provided to show the sedimentation basins were designed with the proper dead pool storage. Jane Byron 10/17/2022 Page 5 K:\021076-000\Admin\Docs\Stormwater Review\Hawkins Stormwater Review Memo 10-17-22.docx Noted, provided dead storage meets this requirement. 6. Easements a. Easements will be needed over all proposed stormwater basins. Easements will be provided. Noted.