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b <br />^ J Bonestroo <br />Rosene <br />Anderlik& <br />I Associates <br />Engineers & Architects <br />October 9, 2000 <br />Bonestroo. Rosene. Anderlik and Associates. Inc. is an Affirmative Action/Equal Opportunity <br />Employer and Employee Owned <br />Principais: Otto G. Bonestroo. PE • Marvm L Sorvala, PE • Glenn R Cook. PE • <br />Robert G. Schunicht. PE • Jerry A. Bourdon. PE. <br />Senior Consultants^ Robert W Rosene. PE. • Joseph C Anderlik. PE. • Richard E. Turner. P.E. • <br />Susan M. Eberlin. C.PA. <br />Associate Principals: Howard A Sanford. PE • Keith A. Gordon. PE. • Robert R Pfefferle. PE • <br />Richard W. Foster. P.E. • David O Loskoia. PE. • Robert C Russek. A.I.A, • Mark A Hanson. PE. • <br />Michael T. Rautmann. PE • Ted K Field. PE. • Kenneth P ArkJerson. PE • Mark R Rolfs. PE • <br />Dav.d A. Bonestroo. M B A. • Sidney P. Williamson PE.. LS. • Agnes M. Ring. M B A. • Allan Rick Schmidt. PE <br />Offices: St. Paul. SC. Cloud. Rochester and Willmar. MN • Milwaukee. Wl <br />NMebsite: www bonestroo com <br />tL <br />Wendy Bottenberg <br />Assistant Zoning Administrator <br />City of Orono <br />Post Office Box 66 <br />Crystal Bay, MN 55323 <br />Re; Larsen Retaining Wall <br />File No. 139-2630 <br />Dear Wendy: <br />We have reviewed the proposed plan for retaining wall improvements to the Gregg and Stephanie Larsen <br />property located at 1380 Rest Point Road. The plans call for the removal of existing stone and wood retaining <br />walls and replacing them with boulder retaining walls. The plans also show the construction of a brick paver <br />patio adjacent to the lakeside of the home. We have the following comments in regards to engineering matters: <br />• Silt fence should be in place prior to any grading or removal activities. <br />• Boulder retaining walls should be constructed with angular rocks to provide wall stability. Boulder <br />walls constructed with round rocks tend to lack stability, similar to stacking marbles. The wall design <br />should incorporate a drainage filter material and drain tile behind the walls and be constructed with the <br />proper batter to provide wall stability. <br />• The area between the two new walls and any other disturbed areas should be seeded and covered with <br />a fiber blanket immediately after grading to prevent erosion. Staked sod is an acceptable alternative to <br />seed and fiber blanket if sod is available. <br />• new walls shall not exceed 4-feet in height without an engineered set of plans submitted for <br />review. <br />• The plans should show proposed elevations for the patio and identify any associated grading. <br />The Minnehaha Creek Watershed District should review and approve the plans. <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 />/ <br />Tom Kellogg <br />Cc: Greg Gappa, City of Orono <br />2335 West Highway 36 ■ St. Paul, MN 55113 ■ 651-636-4600 ■ Fax: 651-636*1311