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1/1 Bonestroo <br />Rosene <br />■Anderlik & <br />1 \| 1 Associates <br />Engineers & Architects <br />Bonestroo. Rosene. Anderlik end Associetes. Inc. Is an Affirmative Action/ Equal Opportunity <br />Employer and Employee Owned <br />Principals: Otto G Bonestroo. PE • Marvin L Sorvaia. PE • Glenn /?. Cook. PE. • <br />Rooert G Schunicht. PE. • Jerry A. Bourdon. RE. <br />Senior Consultants: Rooert W Rosene. PE. • Joseph C Anderfik. PE • Rich <rd £ Turner. PE • <br />Susan .M Eoeriin. C PA <br />Associate Principals. Howard A. Sanford. PE. • Keith A Gordon. PE • Robert R. Pfefferle. RE. • <br />Richard W Foster. PE • David O Loskota. PE • Robert C. Russek. A I.A. • Mark A. Hanson. RE. • <br />Michael T Rautmann. PE. • Ted K Field. RE • Kenneth R Anderson. RE. • Mark R Rolfs. PE. • <br />David A Bonestroo. MBA* Sidney R Williamson. PE. L S • Agnes M. Ring. .MBA.* Allan Rick Schmdt. PE <br />Offices: St Paul. St Coud. Roches:*^ and Wiilmar. MN • Milwaukee. Wl <br />May 9,2000 <br />MMsbsIte: www bonestroo com <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. 139-98*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 S51I3 • 651-636-4600 • Fax; 651-636-1311