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Ouncftroo. Rosene. AnderliN and Astociates. Inc. *f an Affirmat ve Action/Equal Opportunity <br />Employer and Employee Owned <br />Principati; Otto G Bonestroo PE • M.«rv«n L SorvaM. PE • Glc’^n .7 Cooii, PE • <br />Robert G ScHun.cht, PE • Jerry A Bourdon. P£ <br />Senior Coniultants: Robert W Rosene PE • Joseph C Anderiiic. • Richard E Turner PE • <br />Susan M Eberlm. C PA <br />Associate Principals: Howard A Sanford, PE • Keith A Gordon P£ • Robert R Pfefferic, PE • <br />Richard W Foster, PE • David O Loskota. PE • Robert C Russek. A IA • Mark A Hanson. PE • <br />Michael T Rautmann. PE • Ted K Field PE • Kenneth P Andersor .'»* • Mark R Rolfs. PE • <br />David A Bonestroo. MB A • Sidney P Williamson PE , L S • Agres M R.ng. .MB A • Allan Rick Schmidt, PE <br />Offices: St Paul. St Cloud. Rochester and Wiiimar, V\ • Milwaukee Wl <br />U^bslte: WWW bonestroo com <br />1/ J Bonestroo <br />Rosene <br />V 5 Anderlik & <br />^ I Associates <br />Engineers & Architects <br />May 9. 2000 <br />Wendy Bottenberg <br />Assistant Zoning Administrator <br />City of Orono <br />Post Office Box 66 <br />Crystal Bay, MN 55323 <br />Re: Rascher Retaining Wall <br />File No. 139-9? 000 <br />Dear Wendy: <br />We visited the site at 4705 North Shore Drive today to review the existing site conditions. The area located <br />between the home and the lake is landscaped with various short retaining walls constructed of stone and <br />timber. Several large boulders have been placed along the shoreline. A series of stone steps provides access <br />from the home to the lake. All existing landscaping in this area appears to have been in place for some time. <br />The entire area between the home and the lake is mostly vegetated with visual no evidence of slope instability. <br />It is our understanding that the property owner wants to install a series of retaining walls between the home <br />and the lake as shown on the plan you provided. The construction of these walls as shown on the plans would <br />require substantial regrading on the existing steep shoreline. It has been City policy to discourage the <br />construction of retaining walls along the lakeshore and to encourage a natural looking frontage. We <br />recommend that no new retaining walls be constructed on the site between the home and the lake. It is our <br />opinion that the existing retaining walls could be repaired and restored with minimal disturbance to the existing <br />slope. Silt fence should be installed prior to any construction/restoration activity to minimize sediments from <br />washing into the lake. Any disturbed areas should be revegetated immediately following construction to <br />stabilize the slope and minimize erosion. It may be necessary to use fiber blankets on any steeper disturbed <br />slopes to protect the newly seeded areas until the vegetation has been established. <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 />2335 West Highway 36 • St. Paul. MN 55113 • 651-636-4600 • Fax: 65I-636-I3II