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/ , 1 CONSULTING ENGINEERS <br /> Maier Stewart & Associates Inc. <br /> May 19, 1993 <br /> File: 230-181-11 <br /> Mr. Steve Rohlf <br /> Building and Zoning Administrator <br /> City of Elk River <br /> P.O. Box 490 <br /> 13065 Orono Parkway <br /> Elk River, MN 55330 <br /> RE: METRO TRUCKING SITE PLAN REVIEW <br /> Dear Mr. Rohlf: <br /> As requested, we have reviewed the site plan for the proposed Metro Trucking development. This <br /> site is Lot 3 and 4, Block 2, Ar-Mon Commercial Park, located adjacent to Highway 10 at the south <br /> end of the City. Our review of the site plan consisted primarily of an analysis of the site drainage. <br /> This site is proposed to be developed to approximately 85% to 90% impervious surface. The <br /> bituminous parking area is shown to include the entirety of the site excluding a portion that will be <br /> • building and a very small green space proposed for a septic area. With such a high percentage of <br /> impervious surface, essentially all precipitation will exit the property in the form of runoff. The <br /> existing contours shown on the proposed site indicate that runoff will essentially sheet off to the <br /> southeast onto the adjacent properties with a portion of it heading toward the Trunk Highway 10 <br /> ditch. This storm drainage plan as presented is totally inadequate. <br /> Drainage calculations showing both the quantity and the rate of runoff from the site need to be <br /> provided. Also, additional information indicating what system the drainage will run to needs to be <br /> provided. If there is not an existing drainage system available that can handle the increased runoff <br /> from the site, the developer should be required to provide ponding on-site to limit the discharge of <br /> runoff from the site to the rate that was present prior to the development. <br /> If you have any questions regarding these comments, please call. <br /> Sincerely, <br /> MAIER STEWART & ASSOCIATES, INC. <br /> 040 <br /> Terry J. aurer, P.E. <br /> 1111 TJM:tp <br /> 1959 SLOAN PLACE, SUITE 200, ST. PAUL, MINNESOTA 55117 612-774-6021 <br /> 9800 SHELARD PARKWAY,SUITE 102, MINNEAPOLIS, MINNESOTA 55441 612-546-0432 • Equal Opportunity Employer <br /> 181-1915.may <br />