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Bonestroo <br />l?osene <br />Anderlik& <br />Associates <br />EngfnMft S ArcMltcti <br />March 16.1994 <br />Oro o tariMtiQa <br />Seon V * <br />C Aner^^ Af <br />* lo'v«it. <br />Ce«v«l Cm H <br />*€ <br />Ifeat-t C k*^-rcrl. <br />luor M C <br />Hornifm A yrM PI <br />A QMtn. PS <br />M««f i Pf <br />icrin w •otm pf <br />Om 0 LOtW *f <br />iMn C t.«np^ A. A <br />-F-y A PI <br />Mir^ A Pf <br />M fSm' T Pf <br />^ t fM! PC <br />• Aa»i0n A A <br />9eA«^C tu<«|P«L PC <br />mafA#i f A/^i pf <br />Pi <br />MtfPitiP (M* Pf <br />Ppjwi J PyAf. PI <br />I^AM M ClAt A»CP <br />TARITM W PMTI0A PC <br />MCA#flC LfAfA Pf <br />ijAw i Miiird Pf <br />,9ry O PC <br />lennftr P AAf!ifioA Pf <br />WiAi f (M PI <br />«lfr« A Its Pf <br />0«ry W ilMn PC <br />Dr^ j ifcrtpp H <br />A tn^ act k*’-^ Pf <br />p^»# J ' PC <br />lirtO viaiA pf <br />£mt% i jprw! Pf <br />w paacj qim «i. n <br />«rt« I Pf <br />Cpy D t'AwNf Pf <br />» %Pf *9Mtr »| <br />«ppf %ga Pf <br />Otuftpi ^ fp^ Pf <br />M«»a O auataar PC <br />CtA« OnmCv pc <br />A frchtfir <br />cMM <br />Hcrtir M <br />* <br />0 <br />Ms. Jeanne A. Mabusth, <br />Building and Zoning Administrator <br />City of Orono <br />Post Office Box 66 <br />Crystal Bay, Minnesota 55323 <br />Re: Vergeyle Residence <br />FUe No. 139-1909 <br />Dear Jeanne, <br />We have reviewed the geotechnical evaluation and grading, drainage and erosion control plan <br />prepared by Schoeil A Madson, Inc. for the Vergeyle residence. The property is located on <br />Green Trees Road, overlooking Tanager Lake. We have several comments in regards to <br />engineering matters. <br />The two 4*foot tall retaining walls are proposed to control up to 8-feet of fill to be placed on <br />the existing slope. The wall as shown, and noted on this plan, is acceptable from an engineering <br />standpoint. However, more information must be provided to identify the specific block, type <br />of hll and the type of tie-back restraints to be used. Each block manufacturer has specific <br />design chans that may be used depending on the type of fill and loading conditions. The <br />loading condition for this wall must be a 3:1 backslopc. The two walls must be placed at least <br />as far apan as they arc tall (1:1) or a surcharge loading must be used <br />The proposed roof drains, catch basins and 10-inch pipes leading to the bottom of the slope are <br />a good attempt to prevent slope erosion. However, the 10-inch pipe will have an outlet velocity <br />of approximately 25 feet per second which will be difficult to control at the bottom. The pipe <br />may not be necessary if a good ground cover is established. The roof could be drained by <br />downspouts with overland flow. We feel this method has less potential for erosion. <br />We do not recommend or approve of gravity type retaining walls, such as the limestone boulder <br />wall proposed by the builder, due to the difficulty in determining their e^ectiveness. <br />Please contact me at this office if you have any questions regarding this matter. <br />Yours very truly, <br />BONESTROO. ROSENE, ANDERLIK & ASSOCIATES, INC. <br />Shawn D. Gustafson, P.E. <br />2335 West Hlohwav 36 • St. Paul, WIN 55113 • 612-636-4600