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'.W w ——A ^W w * ^ Mww — • <br />Bonestroo <br />Rosene <br />Anderllk& <br />Associates <br />Engineers A Architects <br />Om G <br />U e*u*<*> ' § • <br />C ec <br />Ma-\ r L V'.'VJS ^5 <br />t ^w<rr»* Pf <br />Ce-'l Crc* *£ <br />T*>0-r-J| I S^-^J <br />Shcr-t G. k*'^r'<r.L <br />S.I1- M. Citnn C "A <br />•V* ©' CC'*lwU'^! <br />a Sar*fc <br />M f*» A G:?r!5- »f <br />A:.**e ‘* f # »• <br />• c'4"5 wV »ci:e' *? <br />CevcC <br />•cret C tu5ie« a • a <br />.f'7 A <br />A *-4“ior. ?£. <br />3 A.'v?'>d A, A <br />Dc"a^ Z lu^sr^! *f <br />tfHynxi f Angwl »fc <br />fir*ee^ Me'rir^ Af <br />V'.^er • *J-. <br />M p ; 9*-e >-£ <br />A;^fi Vi tr^ A c» <br />T«»*—j| ’Jl •! <br />C lyc*' <br />^e-^ei » Mjt'-a a# <br />D Aftiwh. Af <br />Ae*'^fL" A A"ce'tcn A| <br />Mjm t kc.\ •? <br />Vjm A. Wo Pi <br />Ci v 0/ Vc. en. A£ <br />r#- e'; <br />Ai^ Xei WA-^dt Afi <br />A»«0 J Cjiwe% A| <br />Mi « C <br />V ei 9 ->'*if ^ <br />U *•• D G'i^ ' As <br />I Wf'^e'*- AT <br />Gi'v r. <'t?c*u Pt <br />• ”3i:d s^ir*' *r <br />f VJSA A| <br />33.511 -I 9e^.*t Af <br />V'JAH D GwtuM-A Aff <br />CfcJiO O.Vff <br />»i A ff fnu:rt <br />:?3 M ^rA^*i*y <br />*- »•#.*' M C'$9n <br />H- <br />Hay 7, 1993 <br />Ms. Jsanns A. Mabusth <br />Building and Zoning Administrator <br />City of Orono <br />Post Offics Box 66 <br />Crystal Bay, Minnesota 55323 <br />Ra: Hennepin County Seawall Repair <br />File No. 139-1820 <br />Dear Jeanne, <br />Si S?Iing^araa?^^At‘threi! iocation2°the'^rSnoff°f?ow2“into^ths lake <br />through 3 foot wide rurb cuts. It is obvious that » <br />sediment presently washes into the lake due to the parking lot. ,, <br />Probably more important is the fact that this hardcover collects oils, <br />pollutants and nutrients that ars flushed Into the lake during rainfall <br />events. The critical period of a rainfall event <br />flushing during the first few minutes of a storm. W« have <br />soma suggestions regarding the surface water control as it relates to <br />the sediment and debris that washes into Lake Mi.nnotonka from the paved <br />parking area. <br />ExciS!!ti‘ar.a» In tha parking lot low pointa. Tha '“'^Ing <br />$*.ip?!r2yS?.f«?k!"’ !s."2«2”Sio™i*bi“ibo5a''' <br />the normal water level of the lake to function properly. At some Pjjjjt <br />in time, t.te granular media would need to be removed and replaced with <br />fresh matsiTial. <br />ExcaSItl'an infiltration trench along the parking lot perimeter. The <br />tJIIS would be tSo feet wide and filled with sand and pea gravel. <br />Some of the runoff would infiltrate into the ground and reach ^*^^2 <br />hv interflow instead of overland flow. Pollutants and nutrients would <br />bl by att!ShiS| to tha granUlar material. Th. •««vation mu.t <br />be above the normal water level of the lake to function properly. To <br />maxim..ze this option, the existing curbing along the perimeter of the <br />parking lot should be removed. <br />V