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Otto G.Bones[roo,PE Howard A.Sznford,PE. Michael P Rau,PE. Mark D.Wallis,PE. <br /> Bonestroo Robert W Rosene PE' Keith A Gordon,PE Philip J Pyne,PE Miles B Jensen,PE. <br /> Joseph C.Anderlik.PE Robert R.Pfefferle.PE. Agnes M.Ring,AJCP L.Phillip Gravel III,PE. <br /> Marvin L.Sorvala,PE. Richard W Fosrer,PE Thomas W Pe[erson,PE. Karen L.Wiemeri,PE. <br /> Rosene Richard E Turner PE David O Losko[z PE Michael C Lyn[h PE Gzry D Krisrofitz PE. <br /> � Anderlik & T�homaR E NoyesEPE Jerbry ACBourd n,PEA Jerry DRPertz ch�PE KeithdR Yappr PE <br /> Robert G.SchunichL PE. Mark A.Hanson,PE. Kenne[h P Anderson.PE. Douglas J.8enoiC PE. <br /> Associ�tes Susan M Eberlin CPA Michael T Rautmann PE Mark R Rolfs PE Shawn D Gus[afson,PE. <br /> *Senior Consultant Ted K.Field.PE. Mark A.Seip,PE Cecilio Olivier,PE. <br /> Thomas R.Anderson.AJA. Gary W Morien,PE. Charles A.Erickson <br /> Engineers & Architects Donald C BurgardL P.E Daniel J.Edgerton.P.E. Leo M Pawelsky <br /> Thomas E.Angus.PE. Allan Rick Schmidt PE. Harlan M.Olson <br /> Ismael Martinez.PE. Philip J.Caswell.PE. James F Engelhardt <br /> March 16, 1994 <br /> _;°`�___ <br /> ��y I!� <br /> � ���./�._....__.. <br /> Ms. Jeanne A. Mabusth, <br /> Building and Zoning Administrator <br /> City of Orono <br /> Pnst Office Box 66 <br /> Crystal Bay, Minnesota 55323 ���'R �' 8 v <br /> Re: Vergeyle Residence <br /> File No. 139-1909 � ��> ,�.��i-7� � ��'�:� _i, ��'?�-�'� <br /> 1 � � <br /> Dear Jeanne, <br /> We have reviewed the geotechnical evaluation and grading, drainage and erosion control plan <br /> prepared by Schoell & 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 fill and the type of tie-back restraints to be used. Each block manufacturer has specific <br /> design charts 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 backslope. The two walls must be placed at least <br /> as far apart as they are tall (l:l) or a surcharge loading must be used. <br /> The proposed :oof�.;ains, catch basins and 1�J-inch p�pes 1_ead?ng tr• thP hottprp nf rhe s�ope 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 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��Tl�'� �- <br /> Shawn D. Gustafson, P.E. <br /> 2335 West Highway 3G • St. Paul, MN 55113 • G1�-63G-4600 <br />