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r <br />BonestfOO <br />Rcsene <br />Anctefllk <& <br />Associates <br />CM»e rnrwmm n <br />C ^ <br />I f« <br />f ft <br />f Pt <br />r G ^ <br />« C t A <br />Engineert A Architects <br />October 6. 19^ <br />C MM <br />C tMPA •?* <br />«. iSiMedkgn Af <br />A Mjf^^er Af <br />V T tmjiinMH. Pf <br />•M n <br />C iM^iiiA ^ <br />A kta ^ <br />J kiMlBII. ff <br />trmt Pf <br />A •fc, <br />A.C ^I <br />C L<si** *f <br />O WwtiAA Pf <br />%I9« .: ^ <br />C Pf <br />Hlwtt * km ^ <br />m Pf <br />PM i CmW. a ( A <br />Oiem» 4 Mgpwow Pf <br />P K* khi^ pf <br />PhAp J C WAP Pf <br />MAP* ■ Pf <br />Pf <br />Pf <br />C Af^M Pf <br />P M Pw> Pi <br />m«p t mm pf <br />j apTM Pf <br />O QiPimim Pf <br />Cmm OfcM Pf <br />PMO PPMI" Pf <br />MW P (jftMi Pf <br />CM«M A IfAftasP <br />imM pppiPfm <br />ft OAPP <br />Ms. Jeanne A. Mabiisth, <br />Building and Zoning Administrator <br />City of On>no <br />Post Otticc Box 66 <br />Crystal Bay, Minnesota 55323 <br />Rc: Corbin RcsiderKC <br />File No. 139 1971 <br />Dear Jeanne. <br />We have inspected the partially constructed KiulJcr wall on the Coibin residence at 4685 North <br />Shore Drive, llic majoritv of the two walls arc 4-feet high which is the maximum height <br />recommended without structural design. Many of the boulders are approximately 12 to 18 inches <br />in diameter which is generally not adequate lor a grasity type retaining wall such as this. A portion <br />of the wall along the gravel driveway is approximately 7-tcet high, llic proposed wall, amstruction <br />techniques and soils arc not acceptable for a wall of this height. The City slH>uId not continue a <br />review of this application until a plan has been prepared by a Registered Engineer. Information <br />which is critical for this type of project includes: <br />- methtxl of providing drainage for walls <br />- method of tic-back restraint for wall <br />- geotechnical evaluation and'or type of fill proposed <br />We would recommend a modular masonry block wall be used for any wall over 4-feet high. IhcfC <br />arc many manufacturers which provide an engineered wall system for almost any application. The <br />wall should have a draintilc line installed to function properly in clay soils. <br />We do not recommend gravity type retaining walls, such as boulder walls, due to the difficulty in <br />determining their effectiveness or durability. <br />/\s an option, the grading above the walls could be modified so that no walls in excess of 4-feet high <br />are necessary. If this option is preferred, a grading plan should be prepared. Silt fence should be <br />installed along the grading limits for erosion control in either case. <br />Please contact me at this office if you have any questions regarding this matter, <br />Yours verv trulv,^ •/ <br />BONESTROO. ROSENE, ANDERLIK & ASSOCIATES, INC. <br />2335 West Highway 36 • St. Paul, MN 55113 • 612-636-4600 <br />...