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Bonestroo <br />Rosene <br />Anderlfk & <br />Associates <br />Engineers & Architects <br />September 9, 1994 <br />Mr. Michael P. Gaffron, <br />Asst. Building and Zoning Administrator <br />City of Orono <br />Post Office Box 66 <br />Crystal Bay, Minnesota SS323 <br />Re: Lear Residence <br />File No. 139-1965 <br />Ono G Bonnooa PE <br />Roben W Btnenc. PE • <br />Joieph C AnoehiiL P£ <br />Mjrvtfi L SorvJU. P£ <br />Richjid E HxTier. PE <br />Gienn P Cook. PE <br />Thomji E Noye\ PE <br />SOOert G SchunchL PE <br />M EDerun. C PA <br />•Senor CornulEjnc <br />Mow^ A SanML PE <br />Ke<h A Gcxdoa PE <br />Rootft P PVHerte. PE <br />P<ru«d W Foittv. PE <br />OjvO O Loskocj. PE <br />Rooea C Pusspk. AIA <br />Jerry A BoufOon. P£ <br />\Urk A Hmson. PE <br />M<rvie< T Rjutmjnn. PE <br />Ted K PieW PE <br />Tronus P Andenon AIA <br />Oonjid C BurgjidL PE <br />Thomas A Syfka PE <br />Fiedenc J Stenooig. PE <br />ismaei Manmei. PE <br />^«hae< P Rau. PE <br />^nes M Pmg, AlCP <br />Thomas w ^tenoa PE <br />Mchae<C Lynch. PE <br />James P MaUnd. PE <br />Jerry O ^azsch PE <br />ScoR J Aiganek. PE <br />Kennech P Anderson. PE <br />Mark P Ml PE <br />Mark A Se^ PE <br />Gary W k«)r«n. PE <br />Paul J Garmon. AiA <br />Darwi J Edgmoa PE <br />A Pek SchTT^dt PE <br />Phaip J Casweff. PE <br />MarkO Vl^«ri PE <br />Miles B Jemea PE <br />f. . • <br />L Phap PE <br />Karen L W«mea PE <br />Gary O KnaoriQ. PL <br />f ibdd Foster PE <br />Kfph P Yipp PE <br />0><gUs J Oenoc PE <br />ShaMwn O Gustahoa PE <br />Cec*o Ovier. PE <br />Pat^ G Heuer PE <br />jonn P Goider PE <br />Charles Enckson <br />LeoM P»Aieniiy <br />HartanM Oson <br />James F Engreiardl <br />(V <br />SEP 1 ^ <br />CVT< <br />Dear Mike, <br />We have reviewed the proposal to replace existing retaining walls and riprap along the shoreline of <br />Spring Park Bay on the Lear residence at 2525 Dunwoody Avenue. The information submitted is <br />incomplete and unacceptable. The City should not continue a review of this application until a plan has <br />been prepared by a Registered Engineer. Information which is critical for this type of project includes: <br />- type of wall proposed <br />- method of providing drainage for walls <br />- method of tie-back restraint for wall <br />- geotechnical evaluation and/or type of fill proposed <br />- cross section of proposed wall and side slopes <br />- loading condition used for wall design <br />- indication as to which of the existing trees will be saved <br />- description of the construction technique proposed for working around the mature trees <br />and root systems in the area <br />We would recommend a modular masonry block wall be used for the improvements. There arc many <br />manufacturers which provide an engineered wall system for almost any application. The wall should <br />have a draintile line installed to function properly in clay soils. <br />We do not recommend gravity type retaining walls, such as boulder walls, due to the difficulty in <br />determining their effectiveness or durability. We do not recommend timber retaining walls as a <br />permanent solution. <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 />2335 West Highway 36 • St. Paul, MIM 55113 • 612-636-4600