Laserfiche WebLink
* * *' -A*»w «r — <br />1/1 Bonestroo <br />^2 Rosenc <br />Anderflk& <br />^ I Associates <br />Cndinctfi a Architects <br />Ostt G ie^ipo^ <br />IS&e*! W IMM f f * <br />:et»on C Ae««^ »ff <br />L larva I <br />tr'*a« I •jrr^. Af <br />i CfifiC •!. <br />I fv«y»4 <br />Ift&rt C. kronen M. <br />S.11^ M S5e#^ C »A <br />•itfJOf Cd^4^4a/^ <br /><# I* A •* <br />tee#^ f <br />•CAJfV VA^ %sr. ^1 <br />O c?«ofB <br />tlB^ C tualt«. A A <br />^•Ty A loufcor H <br />Mam A. Nanioi^ Pi. <br />Mc^aoi ^ Hw5r»ani^ Pi <br />'9^ < f*A Pi <br />t ArcrVBa A»A <br />DcAJid C •! <br />TAor»»*t I AAOi.1 ei <br />V-#1N Vi*T?Tff Af <br />Vbchati P tau Pf <br />; Pv^ p| <br />A-rfi \a Pr-g AC* <br />A Petf'»2 ‘' ■? <br />C ly«CA Pi <br />* Mrtri Pi <br />^#r*y O ArtTWh. Pf <br />Ker.rjcn P A^^fjcr. PI <br />Mani t AaH ■£ <br />Ma^ A. Sto Pf <br />C#y VW *£ <br />ZsTAi I Uit^. •! <br />A*^ l«k Pfe <br />p»t« 1 Cai»*«* PI <br />Ma't ^ \4iAi If <br />I .p'^atci Pi <br />I P^fcB O'tMP' fH. PI <br />L. ‘A^e ’***A Pf <br />Ga*y Cl A.’'iw*t|. Pi <br />• S<M8tf p| <br />l^tA • >^0A PI <br />00^ •« i fP^'t Pf <br />ihax^A 0 P* <br />Ceviio C?Vt». PS <br />C'ar’Pe A inckioA <br />LP3 M PMfVtf <br />M <br />^psrti P r-gc ha-'Ot <br />H- <br />May 7, 1993 <br />Ma. Jaanna A. Kabuath <br />Building and Zoning Adniniatrator <br />City of Orono <br />Post Offlea Box 66 <br />Crystal Bay, Minnesota 55323 <br />Ra: Hennepin County Seawall Repair <br />File No. 139-1820 <br />Dear Jeanne, <br />Wa have reviewed the application from the Hennepin County Dapartmont of <br />Environnantal Manageaent involving the repair of a seawall. On ou^£,nvironin«m;.ai n«r*eig«ai»in-. xiivwxvx**^ -- - - - -- <br />recant site inspection the following observations ware n**®®* <br />the parXlng area. At three locations the runoff flows into the lake <br />through 3 foot wide curb cuts. It is obvious that a i®^9® amount of <br />sadiaant presently washes into the lake due to the <br />Probably more iraportant is the fact that this hardcover collects ' <br />pollutants and nutrients that are flushed into J^*® <br />events. The critical period of a rainfall event <br />flushing during the first few minutes of a storm. We have <br />a/^TRA Aimni.onB cBQBr*di.ncr th® suir^zicB wzitBir contjrol fts rBlBtfts to <br />the sed?nent and debris that washes into Lake Minnetonka from the paved <br />parking area. <br />nutrients would be trapped by attaching to the granular material, much <br />in the same way a septic system works. The excavation must be above <br />the normal water level of the lake to function properly. At some point <br />in time, the granular media would need to be removed and replaced with <br />fresh material. <br />?xcJS^te an infiltration trench along the parking lot perimeter. The <br />t^enS would be two feet wide and filled with P*Jjravel. <br />Some of the runoff would infiltrate into the ground and reach the lake <br />bS interflow instead of overland flow. Pollutants and nutrients would <br />i?aoosdbv attaching to the granular material. The excavation must <br />5! ^^SSElhs^normal water level of the lake to function properly. To <br />maximize thie option, the existing curbing along the perimeter of the <br />parking lot should be removed.