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I^9 <br />Bonestroo <br />Rosene <br />AfxJertik & <br />Associates <br />Engineers A Architects <br />October 11. 1994 <br />Ode O •f <br />dnM>f « ^ • <br />k<vdb« ^ <br />iKfXditft \lF». *f <br />• Cm 'f <br />*'*««wnai I ^ <br />•toe* 0 ^ <br />W«r M C ^ • <br />•■-nor Cjnwtjrt <br />^Me? • MM n <br />MT A :,j..'«nn <br />•BMW « •• <br />•b«^« a ^ <br />OMM C <br />Mbw C *u%«« a « <br />A Mmbt et <br />M»w A WBTW At <br />Mfc «M T IM»BPW •< <br />1 har>sM t AMWnr « a <br />Oce M C lUMi ^ <br />Teor-^ A WA k < Af <br />•Mwr ; lilwniiM^ M <br />Af <br />MthdT A Bf <br />lA lM« A c A <br />*h«»hpi *’ Mi' — ■ Af <br />MrAoP C IMW At <br />wne- • MUM At <br />•*\ D Mo%h Af <br />» ae Af <br />M' AM a AnM-M Al <br />MW • M\ Af <br />MpA a <ifi«. Af <br />a«rf '4> A| <br />Aiu I Ganf%er\ a = a <br />Dm J tiAfi'Wi At <br />A Birt kMMi At <br />AMp i Cmw« Af <br />Maw Af <br />MM • Jntn At <br />Mr. Michael P. Gaffron. <br />Asst. Buildini; and Zoninf; Administrator <br />City of Orono <br />Post Office Box 66 <br />Crystal Bav. .Minnesota 5.>323 <br />Re: Lear Residence <br />File No. 139-1%-^ <br />Dear Mike, <br />Wc have reviewed the report prepared by American l:ngineering Testing. Inc. for the <br />proposed retaining walls and riprap along the shoreline of Spring Park Bay on the Lear <br />residence at 2525 IhinwTDody Avenue. The most recent plans for the retaining wall system <br />are acceptable from an engineering standpoint, Ilmvever. the plans show a slope of 2.5 to <br />1 and we would recommend a maximum slope of 3 to 1 (horizontal to vertical). ITic <br />steeper slopes will be difficult to maintain and would represent a high potential for erosion <br />until a suitable ground cover has been established. Unless the grading i.s moditied, the <br />applicant should provide more information about the type of ground cover proposed and <br />whether or not the slopes will be mowed. If seeding is proposed, we recommend an erosion <br />control blanket be used for the steep slope areas. Prior to starting the work, silt fence <br />should be installed along the shoreline for e:i .non control. <br />IMea.se contact me at this office if you have any (juestions regarding this matter. <br />Yours verv trulv. <br />BONESTROO, ROSF.NE, ANDERLIK & ASSOCIATES, INC. <br />Shawn D. Gustafson. P.E. <br />2335 West Highway 36 • St. Paul, MINI 551J3 • 612-636-4600