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1/ J Bonestroo <br />Rosene <br />Anderlik & <br />^ \ Associates <br />Engineers & Architects <br />BorMilroo. llostnt. Andtrlih and AtiocUiet. Inc. ti «n Affirin«Civ« Action/Equaf Opportunity Employer <br />«nd Employe* Owned <br />(i <br />frincipeli: Otto 0 Boncilfoo. PE • M.irvin I Sorv<iM. PE • Glenn R Cook. P£ • RoPeit G Scnwnicht. PE • <br />Jerry A Bourdon P£ <br />Senior Coniullonti; Robert W Roser^e. PE • Joseph C Anderim PE • Richard E Turner. PE • Susan M Eberiin. C PA <br />Assoclece Principoit Knth A Gordon. PE • Robert ft Pf.dferie • Richard W Foster. PE • David O Loskota. PE • <br />Mark A Hanson P£ • Mirh.tri T Rautmann. P£ • Ted It Fii»d P£ • Kenneth P Arsderson. P£ • M*ttk R Rods, PE • <br />OaviJ A Bonestroo MB A • Sidney P Williamson. PE. LS • Agnes M Ring. MB A • Auan Rick Schmidt. PE • <br />Thomas W Peterson. PE • James R Maland. PE • Miles B Jensen. P£ • L Phiii p Gravel ui. P£ • Daniel J Edgerton. PE • <br />lsm.<ei Marline/. PE • Thomas A Syfko PE • Sheldon J Johnson • O^e A Grove. PE • Thomas A Roushar. P£ • <br />Robert J Devery. P£ <br />October 8.2001 <br />Offices: St Paul. Si Cloud. Rochester and Wilimar. MN • Miiw.tukce. Wl • Chicago IL <br />Wibsite; WWW bonestroo com <br />Wendy Boltenberg <br />Assistant 2^ning Administrator <br />City of Orono <br />Post Office Box 66 <br />Crystal Bay. MN 55323 <br />Re: Timp Retaining Wall <br />File No. 139-01-000 <br />Plat No. 01-2724 <br />Dear Wendy: <br />We have reviewed the grading plans for the Timp residence located on Lot 2. Block I. Wildhurst Estates. The <br />following are comments from Phil Caswell in our structural department: <br />I.The wall design itself appears to be adequate. Without doing an independent analysis, the 22-degree <br />batter appears to be sufficient for local stability. The design is also signed by a P.E. <br />2.At the highest point of the wall (8-foot height) up to 6’ or 7 ’ of fill will be brought in to place behind <br />the wall, while the slope in front drops away from the wall at 2:1 to 2.5:1. This additional load on this <br />slope under these conditions suggests that the global slope stability m*’st be investigated. We suggest <br />that a P.E. analyze the slope stability for the worst condition, using parameters of the actual site soils. <br />If this is adequate, the rest should be too. <br />Please contact me at (651) 604-4863 if you have any questions regarding this matter. <br />Yours very truly. <br />BONESTROO. ROSENE, ANDERLIK & ASSOCIATES. INC. <br />Tom Kellogg <br />Cc: Greg Gappa, City of Orono <br />\v <br />2335 West Highway 36 • St. Paul, MN 5SII3 • 651-636-4600 • Fax: 651-636*1311 <br />:i <br />i <br />i