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Bonestroo <br />RDsene <br />Anderlik& <br />Associates <br />Ei^fnMrs & Architects <br />October 11, 1994 <br />Otio G BonestfOQ PE <br />ftohen W Uotene PE • <br />joieph C Andert* PE <br />Mjrvm i Stxvatj. PE <br />RchaitJ E Turner. PE <br />Gimn P Coot. PE <br />Thomji E Noy«\ PE <br />RohetT G ^hunchL PE <br />Suvjn M Et)efiei. C PA <br />•SeoKX ConsuR^nf <br />HoM^afO A Saniord PE <br />iceeh A Gordon. PE <br />Hooen P PE <br />PicMid W Potter PE <br />David O LosiDCj PE <br />Rooert C Puiiek. A <br />Jerry A Bourdon PE <br />Mart A Hjnson. PE <br />Mchaei T Rautmarm. PE <br />Ted P P«4d PE <br />Thomas R AnderV)n. A J A <br />Dorsaid C Buigaidt PE <br />Thomai A Syfha PE <br />Fiedenc J SterrOOtg. PE <br />lynaet Martmea. PE <br />Mchae* P Bau PE <br />Agnes M Ring. AiC P <br />Thomas W Rmnon. PE <br />Mchael C lynctv PE <br />James P Maiand PE <br />Jerry D f^rinch. PE <br />Scott J Aiganet. PE <br />Kenneth P Anderson. PE <br />ERarfe P Me PE <br />Mark A Se«L PE <br />Gary W Monen PE <br />Paul J Cannon A i A <br />Dartei J Edgertorv PE <br />A P<k SchmeJt PE <br />Phtf) J CaskveR. PE <br />Mart O PE <br />Miles B Jemen PE <br />L Ph*^ Crawei PE <br />Kaien i SVcmen PE <br />Gvy D moPlL PE <br />f ladd PosHf. PE <br />Mh t TM PE <br />Oougtas J Berwt. PE <br />SnjMvnO Guttalion. PE <br />Cec*o OiM*r PE <br />Pmm G Meuer. PE <br />John P GorOh PE <br />Charles A Enctson <br />leoM Paw«tsty <br />Harlan M Otson <br />James f EngeRsam <br />Mr. Michael P. Gaffron, <br />Asst Building and Zoning Administrator <br />City of Orono <br />Post Office Box 66 ^ <br />Crystal Bay, Minnesota 55323 <br />Re: Lear Residence <br />File No. 139-1965 <br />Dear Mike, <br />We have reviewed the report prepared by American Engineering Testing, Inc. for the <br />proposed retaining walls and riprap along the shoreline of Spring Park Bay on the Lear <br />residence at 2525 Dunwoody Avenue. The most recent plans for the retaining wall system <br />are acceptable from an engineering standpoint. However, the plans show a dope of <br />1 and we would recommend a maximum slope of 3 to 1 (horizontal to vertical), ^e <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 is modified, 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 erosion control. <br />Please contact me at this office if you have any questions regarding this matter. <br />Yours very truly, <br />BONESTROO, ROSENE, ANDERLIK & ASSOCIATES, INC. <br />Shawn D. Gustafson, P.E. <br />2335 West Highway 36 • St. Paul, MIM 55113 • 612-636-4