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• <br /> imprAor sal <br /> MEMORANDUM <br /> ❑ ST.PAUL.MN 0 MINNEAPOLIS, MN 0 ST. CLOUD,MN 0 CHIPPEWA FALLS, WI 0 MADISON, WI 0 LAKE COUNTY, IN <br /> TO: Pamela Sheldon, Mounds View Community Development Director <br /> FROM: Rocky Keehn, P.E."¢ <br /> DATE: June II, 1997 9 <br /> RE: t Review of Silver Lake Common, Planning Case 487-97 <br /> SEH has reviewed the site survey and the proposed building locations for the above referenced project <br /> as requested. Based on the information provided to us on June 10, 1997, we recommend that the <br /> following issues be discussed in greater detail prior to final approval: <br /> ► Drainage of the property north of the site. <br /> ► Impacts of drainage from Eastwood Road. <br /> The following items also will need to be provided to SEH prior to a finalizing our review: <br /> ► A site grading planning with proposed elevations that show how the surface water runoff gets to <br /> the pond. <br /> ► A grading plan of the pond showing side slopes and pipe inverts. <br /> ► Hydrologic calculations that indicate the expected highwater elevations in the pond for the 1 and <br /> 100 year storm events. <br /> Following is a discussion of each item in more detail. <br /> Drainage of the property north of the site <br /> Based on the elevations shown on the submitted survey and city contour map, a low area exist just <br /> north of the proposed site. The outflow elevation, based on the developers survey, is 910.9 feet. It <br /> appears the proposed plan blocks the drainage by placing a building over the natural overflow from <br /> this low area. The developer needs to show how they intend to maintain a 910.9 overflow elevation <br /> with similiar discharge capacity to prevent future flooding of the areas north of the site. <br /> Impacts of drainage from Eastwood Road. <br /> A bituminous swale presently drains runoff from Eastwood Road to the Highway 10 ditch. The swale <br /> is located on the developers property. The proposed plan locates a pond over the swale and thus may <br /> require a change of the existing drainage outlet from Eastwood Road. Since this is a public road <br /> Ai which discharges runoff over private property, the City should determine the best way to drain <br /> Eastwood Road. <br />