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1111 St June 22, 1995 <br /> File: 230-179-11 <br /> CONSULTING ENGINEERS <br /> 1326 Energy Park Drive Mr. Gary Schmitz <br /> St.Paul,MN 55108 Planning Assistant <br /> 612-644-4389 City of Elk River <br /> 1-800-888-2923 13065 Orono Parkway <br /> Fax:612-644-9446 P.O. Box 490 <br /> Elk River, MN 55330 <br /> RE: DICKENSON BUS GARAGE DRAINAGE PLAN <br /> Dear Mr. Schmitz: <br /> As requested, we have reviewed the drainage calculations for the revision to the Dickenson <br /> Bus Garage drainage system. These calculations were prepared by John Oliver and <br /> Associates, and dated June 8, 1995. Essentially, the proposal is to eliminate one of the on- <br /> site ponding areas to allow for additional paved parking area on the site. As you recall, the <br /> CIVIL ENGINEERING original drainage system had a pond in the north part of the site and one in the south part <br /> ENVIRONMENTAL of the site to detain and treat the runoff prior to discharging to the wetlands in the area. <br /> dikuNICIPAL The proposed change is to eliminate the most northerly pond and to treat all runoff in the <br /> NNING southerly pond. <br /> SOLID WASTE <br /> STRUCTURAL In reviewing the calculations, we find that they are all appropriate, and we would <br /> SURVEYING recommend approval. We would suggest two minor changes. First, the outlet proposed <br /> TRAFFIC from the pond to the south is a 12" pipe with a flared end section. The existing outlet is <br /> TRANSPORTATION a vertical standpipe type of arrangement. We suggest that the additional new outlet be of <br /> the same type as the existing outlet. The second item I would point your attention to is the <br /> ELECTRICAL/MECHANICALNGINEERINpaved flumes which take the runoff off of the parkingarea to this pond. These have the <br /> ENGINEERING: <br /> HVAC potential of ongoing erosion problems. We suggest that catchbasins and small diameter <br /> POWER DISTRIBUTION pipe be utilized to collect the water from the paved surfaces and discharge it to the pond <br /> SCADA to eliminate potential erosion problems. <br /> SYSTEM CONTROLS <br /> If you have any questions regarding these comments, please call. <br /> Sincerely, <br /> MSA, CONSULTING ENGINEERS <br /> 24f-eGl",() <br /> WFFICES IN: Terry J. fOlaurer, P.E. <br /> INNEAPOLIS <br /> PRIOR LAKE TJM:tw <br /> 179-2231-jun <br /> ST.PAUL <br /> WASECA <br />