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Bogart, Pederson <br />& Associates, Inc. <br />LAND SURVEYING <br />CIVIL ENGINEERING <br />MAPPING <br />January 18, 2016 <br />Jesse Hartung <br />President <br />Modern Construction of Minnesota, Inc. <br />621 Main St. <br />Elk River, MN 55330 <br />Dear Mr. Hartung, <br />This letter is in response to your inquiry about the stormwater management basin in the <br />MISSISSIPPI RIDGE plat that is adjacent to Lot 4, Block 1, MISSISSIPPI RIDGE 2ND <br />ADDITION. This basin was designed to accommodate the runoff from the MISSISSIPPI RIDGE <br />development. The original two lots along Yale Court NW south of 171St Avenue NW were later <br />split into the four lots of MISSISSIPPI RIDGE 2m ADDITION. The original MISSISSIPPI <br />RIDGE Drainage Summary dated 2/7/2001 indicated a 15 inch storm stub for Lot 2, Block 2 <br />with plans indicating a 12 inch RCP stub. <br />From my understanding of the Feasibility Report for Yale Street, Street and Utility <br />Improvements, prepared for the City of Elk River, MN, dated July 28, 2014, the report indicates <br />the need for a frontage road which extends southerly into Lot 4 from the Yale Court NW cul-de- <br />sac. It appears the storm basin south of 1701h Ave. NW would be partially filled to construct the <br />proposed frontage road with a proposed storm sewer to convey overflow stormwater to the <br />proposed expansion of the basin in the MISSISSIPPI RIDGE plat that is northwest of Lot 4. <br />Though I have only the Feasibility report and thus no drainage calculations, the expansion of the <br />basin northwest of the cul-de-sac is probably a direct result of the filling of the basin south of <br />1701h Ave. NW. Possible avoidance of the subsequent expansion of the existing basin northwest <br />of the cul-de-sac from the layout in the Feasibility report include the following: <br />The basin south of 1701h Ave. NW serves a large drainage area. Any storage basin <br />proposed between 167th Ave. NW and 1701h Ave. NW and between Yale St. NW and <br />Highway 10 could mitigate the storage effects of the filling of the basin south of 1701h <br />Ave. NW. <br />Infiltration basins or trenches could be proposed along the proposed frontage road <br />corridor. This would be in line with current NPDES requirements. Examples would <br />include the east side of the frontage road at about STA. 128+00 or west side of the <br />frontage road at about STA. 111+25. <br />Main Office: Becker Phone: 763/262-8822 <br />13076 First Street Toll free: 888/210-8301 <br />Becker, MN 55308 Fax: 763/262-8844 <br />