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Bonestroo <br />Rosene <br />Anderlik & <br />Associates <br />Otto G PE <br />HOOert W Soicnc. P£ • <br />Jovrpn C And^i k <br />K^^r\ r L Sory. j:j PE <br />P-CfjrJ E PE <br />G^enn CoctL PE <br />Trxyrji E ^oyr\ PE <br />Pr>t>m G 5c^ur<f!t PE <br />Suun M CP^ <br />•Senof Conu>.Mnt <br />Engineers & Architects <br />MowvjrrJ A Sjrfom. PE <br />Kf'Lh A GorOcn. P£ <br />RoC^rt « PfWfprif PE <br />PthartJ W Potter PE <br />D^<J O Lcikrfa PE <br />RcL'e't C Puise^ A i A <br />Jerry A SourtJcn PE <br />Mark A Manvoo PE <br />M<haH T Rautmann P£ <br />TeO ^ E-exJ PE <br />Tnomas R Anoervxi. AIA <br />Oonak} C Buf9JrCL PE <br />Thomat E An^i PE <br />lynjH PE <br />Mcr^ae* P #au PE <br />A<;of V M Prng A IC P <br />Thomat W Petervjn. PE <br />M<hae< C L>ixn PE <br />Jar^l R Wa'and PE <br />Jefry D PefTrii** PE <br />(crn-nen P *roervxi PE <br />Wafk R Ro»*i PE <br />Mark A Seo PE <br />Gar> .V Morjen PE <br />Dan»ei J EcJgerroo. PE <br />Daryl K Knct^erwi^n. PE <br />Phil o J Catwri PE <br />Mark D aaiit. PE <br />Maes 8 Jenien PE <br />L Phift.p Gravel m PE <br />Karen L W e'^en PE <br />Gary D PE <br />F TotJO Foster PE <br />Ke-tn R Yapo PE <br />Shawn D Gottjrson I <br />Cec'^o O^fver PE <br />Charles A Er<kvon <br />Leo M Pawersky <br />Harlan M Oisors <br />Jarnes F En<^ihana <br />October 14. 1992 <br />Ms. Jeanne A. Mabusth <br />Building & Zoning Administrator <br />City of Orono <br />P.d. Box 66 <br />Cr>'stal Bay, Minnesota 55323 <br />Re: Robert Koehnen Variance <br />Our File No. 139-1773 <br />Dear Jeanne: <br />Subsequent to our site inspection we have prepared this letter to address our concerns. Tlie <br />applicant has repaired the e.xisting garage on the property. The garage does not meet the <br />current setback requirements and will need a variance. TTie applicant has also constructed <br />a boulder wall that starts at the house and wraps northerly and westerly behind the garage. <br />The wall is approximately 8 feet tall and is constructed with 2 to 3 foot diameter boulders, <br />llie wall functions as a gravity type retaining wall and has not been approved by an <br />engineer. The City should be aware that the wall constructed should not be approved by <br />the City and that the wall represents a safety risk. The homeowner should have the sol j <br />liability in the event of a failure. Any retaining wall with a height over 4 feet should be <br />designed by an engineer to include a tie-back reinforcement and draintile behind the wall. <br />Tlie wall as it is constructed has a risk of buckling and collapsing. <br />Tlie three mature trees along the top of the wall will provide soil stability by means of their <br />root base. Tlie small immature tree.", between the w'all and fence should be cut down, but <br />the roots should remain for stability. <br />Plea.se contact me at this office if you have any questions. <br />Yours very trulv. <br />BONFSTROO, ROSENE, ANDERLIK & ASSOCIATES, INC. <br />J ’I <br />Shawn D. Gustafson, P.E. <br />SDC,:dh <br />2335 West Highway 36 • St. Paul, Minnesota 55113 • 612-636-4600