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- . , � �' � Bonestroo,Rosene,Anderlik and Associates,Inc.is an Affirmative Action/Equal Opportunity Bonestroo Employer and Employee Owned Principals:Otto G.Bonestroo,P.E.•Marvin L.Sorvala.P.E.• Glern R.Cook,P.E.• � Rosene Rober[G Schunicht.PE.• Jerry A.Bourdon.P.E. Anderlik & Senior Consultants:Robert W.Rosene.P.E.• Joseph C.Anderlik,FE.•Richard E.Turner,PE.• Susan M.Eberlin,C.P.A. Associates Associate Principals:Howard A.Sanford,P.E • Keith A.Gordon.PE.•Robert R.Pfefferte,P.E • Richard W.Fos[er,P.E.• David O.Loskota.P.E.• Robert C.Russek,A.I.A.•Mark A.Hanson,P.E.• Engineers &Architects Michael T.Rautmann,P.E.•Ted K.field.PE.• Kenneth P.Anderson,P.E.•Mark R.Rolfr,P.E.• David A.Boneztroo.M.B.A.• Sidney P.William5on,P.E..L.S.• Agnes M.Ring,M.B.A.�Allan Rick Schmidt.P.E. Offices:S[.Paul.St.Cloud.Rochezter and Willmar,MN• Milwaukee,WI Website:www.bonestrao.com October 9, 2000 Wendy Bottenberg Assistant Zoning Administrator City of Orono Post Office Box 66 Crystal Bay, MN 5�323 Re: Larsen Retaining Wall File No. 139-2630 Dear Wendy: We have reviewed the proposed plan for retaining wall improvements to [he Gre�j and Stephanie Larsen property located at 1380 Rest Point Road.The plans call for the removal of existin�stone and wood retaininQ walls and replacing them with boulder retaining walls.The plans also show the construction of a brick paver patio adjacent to the lakeside of the home.We have the following comments in regards to engineering matters: • Silt fence should be in place prior to any grading or removal activities. • Boulder retaining walls should be constructed with angular rocks to provide wall stability. Boulder �valls constructed with round rocks tend to lack stabili[y,similar to stackin�marbles.The wall desi;n should incorporate a draina�e filter material and drain tile behind the walis and be constructed with the proper batter to provide wall stability. � • Tl,e area between[he two new walls and any other disturbed areas should be seeded and covered with a fiber blanket immediately after grading to prevent erosion.Staked sod is an acceptable alternative to seed and fiber blanket if sod is available. • ��Q ne�v walls shall not exceed 4-feet in heiaht without an engineered set of plans submitted for re��iew. • The plans should show proposed elevations for the patio and identify any associated grading. • The Minnehaha Creek Watershed District should review and approve the plans. Please contact me at (651) 604-4863 if you have any questions regardin�this matter. Yours very truly, BONESTROO, ROSENE, ANDERLIK&ASSOCIATES, INC. /� �.��`��'� � �/ Tom Kellogg Cc: Grej Gappa, City of Orono 2335 West Highway 3G ■ St. Paul, MN 55113 ■ G51-G3G-4G00 ■ Fax: 651-G3G-1311