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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 /> Modem 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 2ND 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 170th 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 /> 170th 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 170th Ave.NW serves a large drainage area.Any storage basin <br /> proposed between 167th Ave.NW and 170th Ave.NW and between Yale St.NW and <br /> Highway 10 could mitigate the storage effects of the filling of the basin south of 170th <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 Tol free: 888/2104301 <br /> Becker.MN 55308 Fax: 763/262-8844 <br />