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06/11/97 WED 14:25 FAX 612 490 2150 SEH ..-r-► HOUNDS VIEW 11002 <br /> • <br /> , rai <br /> Aim ► MEMORANDUM <br /> •ST.PAUL.MN 0 MINNEAPOLIA AIN D ST.CLOUg MN O C1 IPPEWA ALLA Al D MADISON,WI p LAKE COUNTY,IN <br /> TO: Pamela Sheldon,Mounds View Community Development Director <br /> FROM: Rocky Keehn,P.E. <br /> DATE: June 11, 1997 <br /> RE: 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 /> 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 aimilinr discharge capacity to prevent femme 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 4111 <br /> require a change of the existing drainage outlet from Eastwood Road. Since this is a public road <br /> which discharges runoff over private property, the City should determine the best way to drain <br /> Eastwood Road. <br />