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ij:ce 61c eie 121 eC^£.£'KCC i -wiC >- . Ct <br />1/1 Bonestroo <br />Rosene <br />Anderllk & <br />Associates <br />Engtnttrt S Architects <br />March 16. 1994 <br />Orra a <br />locrt •ov#'^ • <br />.oercr C <br />• Sc*v<*i *1 <br />• Coo» <br />£ Scvei •£ <br />•Mn C k-.r«crL •£ <br />M IS#'V% C PA <br />•^«f f <br />A w^*3 Pf <br />Jter A OofQor •• <br />t '•f <br />sA pjrpt p? <br />C:>v<» 0 •? <br />SoDf- C A ^ <br />^e-y A lo-tca*^ *•• <br />A Spr>iO*^ Pf <br />Vr*«#» T Pf <br />*td « f ^ ^ •£ <br />•♦^ynei P Arset ia- * a <br />»raA c lu^rei P£ <br />f Ar*gui Pf <br />''ey P£ <br />• •»- •£ <br />PA i.C - Pv-A# Pf <br />M A c p <br />’•yyAis a PKt'ACA Pf <br />m<cam* c ijrxA Pf <br />t vi a^a Pf <br />n ^?w.‘A Pf <br />fprnttr • AAitrwjA Pf <br />M«f« t ft9i*t PS <br />M«r« P M Pf <br />C4'> •4' MOfP« Pf <br />J laoP^cp" •! <br />A.ijr *c« P| <br />Pa»« j CepA«' P£ <br />Mr« J wi<ahit Pf <br />Vhe^ ft Jpr*ip« Pf <br />^ PA%ip C’iv*i *1 *f <br />k VA 0^*^ Pf <br />Gery D Pf <br />t >*oc Pavr P| <br />ftKP » Pf <br />nou^ ^ Sr^t ■! <br />D 3w^t•^cy‘ Pf <br />Cif « Oat#- P£ <br />A If :isor <br />M Pp»<i^^V <br />V O r <br />► iirjP ■'4"9? <br />IRACE <br />RACKS <br />TER <br />:tion <br />Ms. Jeanne A. Mabusih. <br />Building and Zoning Administrator <br />City of Orono <br />Post Office Box 66 <br />Crystal Bay, Minnesota 55323 <br />Re: Vergeylc Residence <br />File No. 139-1909 <br />Dear Jeanne, <br />We have reviewed the geotechnical evaluation and grading, drainage and erosion control plan <br />prepared by Schocll & Madson. Inc. for the Vergeylc 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, tj^c <br />of fill and the type of tie-back restraints to be used. Each block manufacturer has specie <br />design charts that may be used depending on the type of fill and loading conditions. The <br />loading condition for th:s wall must be a 3:1 backslopc. The two walls must be placed at least <br />as far apart as they arc tall (1-T) 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 arc <br />a good attempt to prevent slope erosion. However, the 10-inch pipe will have an outlc^elocity <br />of approximately 25 feet per second which will be difficult to control at the bottom. The pi^ <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 effectiveness. <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 />i). <br />Shawn D. Gustafson. P.E.