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IZ w «^ « ' ** a> — W <br />Bonestroo <br />Rosene <br />And0rlik& <br />1'^ I Associates <br />Engineers & Architects <br />O-fi G <br />»C5#i U' Pg • <br />jc!»h^ C f if <br />w V'VJ a <br />If'-J-C t <br />Qf»v> I Ccce. •£ <br />c <br />aoci-! C ^1 <br />kiJ'* M 15?''^. C *A <br />•k** 0^ Cc/^iw ti-*t <br />cr :•• A r-i r?t'* »l <br />tc-#** f f »# <br />»rr»' >5 <br />Cj /^5 O l-ic:*# <br />♦crf'T C •-lie* A A <br />.*^7 > <br />a M4-I3T PI <br />W c’*jr ’ •£ <br />•ftf < f t<j <br />Trwii f ArcT'W'^ A * <br />Sc-i-f C •! <br />ft ►! <br />f!r-#e/Mi'trfT A| <br />»- p ; •.-? <br />'A ft^g A c ® <br />>x •! <br />(T i pp <br />.AA-fj f *.«j i-i Pi <br />,fffy O •f'TlVCn. Af <br />«#r^t»n A A'*cf»icr' <br />MS'! r •» <br />A Wo <br />u*7 W Vc*en. '» <br />r#- e« i »f <br />tet —<i! *6 <br />1 CjiA^t A! <br />Mj » r AJkl 'f <br />V fi J <br />of^ I ‘A/f'-c- *r <br />Ol^' C <rf«c*U <br />S 'vt,i <br />e#?* 9 pf. <br />Oo-<; II i fe^A.1 Pi <br />V'jv^/' 3 OwltA'I'S^ Af <br />CfCJO C ve» II <br />C"A# II A ertticr' <br />irs V <br />M 0‘io^ <br />^1 r*-| r <br />HL <br />Hay 7, 1993 <br />Mb. Jeann* A. Mabusth <br />Building and Zoning Administrator <br />city of Orono <br />Post OfficB Box 66 <br />Crystal Bay, Minnesota 55323 <br />Be: Hennepin County Seawall Repair <br />File No. 139-1820 <br />Dear Jeanne, <br />We have reviewed the application from the Hennepin County Department of <br />Environmental Management Involvlnq the repair of * <br />recent site inspection the following observations were wade. The <br />existing bituminous parking lot drains oJ* <br />The runoff is controlled by a bituminous curb ®lo[)9 <br />the parking area. At three locations the runoff flows into the lake <br />through 3 foot wide curb cuts. It is obvious that a -»J9e amount of <br />sediment presently washes into the lake due to the parking . <br />Probably more important is the fact that this hardcover collects oils, <br />pollutants and nutrients that are flushed into the Ijjj® <br />events. The critical period of a rainfall event <br />flushing during the first few minutes of a ,S Tt ^iStM^to <br />the sed?ment and debris that washes into Lake Minnetonka from the paved <br />parking area. <br />Excivatiar««» in tha parking lot lo« polnta. Tha axiating curbing <br />along the lot would direct tha aurfaco drainage to the axcavationa <br />which would be filled with sand and pea gravel, pollutants and <br />nStrianta would ba trapped by attaching J® pi ibo5i<r« wav e aeotlc svstem works. The excavatxon must oe acove^ <br />the normal water level of the lake to function properly. At some <br />in tine, tha granular media would need to ba ranovad and replaced with <br />freah material. <br />E^ivStian infiltration trench along tha parking lot perimetar. The <br />f«S2h woSld ba“wo teat wide and filled with P*® <br />gr*n?«?5:v"iS««rSf^i«uh5*noi""%iuu?Snt;^nS^s??i!;nt!;%iSi^ <br />be t?«5id bv SttIJhing to the grir^ular natorlal. The excavation muat <br />bJ itovS ?h. nS^Jrililtar level of tha lake to ^“"®tion properly. To <br />maximize thie option, the existing curbing along the perimeter of the <br />perking lot should be removed.