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(..— <br /> �°-� <br /> Barr Engineering Company <br /> 4700 West 77th Street• Minneapolis, MN 55435-4803 <br /> Phone:952-832-2600• Fax:952-832-2601 <br /> ���� Minneapolis,MN•Hibbing,MN•Duluth, MN•Ann Arbor,MI•Jefferson City,MO <br /> June 15, 2006 <br /> Mr. Steve Sundby <br /> 3587 Northshore Dr. <br /> Wayzata,MN 55391 <br /> Re: Retaining Wall Evaluation <br /> Dear Mr. Sundby: . <br /> introductic�n <br /> Barr Engineeri.ng is pleased to present the following findings and recommendations <br /> , regarding the retaining wall evaluation at the Sundby residence. <br /> Two tim.ber retaining walls are located on the property of the Sundby residence at 3587 <br /> Northshore Dr.in Wayzata,Minnesota. The main wall has a maximum height of • <br /> approximately 10 1/2 feet, and faces southeast and northeast.A blacktop driveway is <br /> located at the top of the upper tier of the two-tiered wall,with each tier being <br /> approxunately 5 to 5 1/2 feet high. A second wall, approximately 5 feet high,faces <br /> northwest and southwest. The concrete portion of the driveway is located at the crest of <br /> this wall behind two coniferous trees.Both walls aze made of treated timbers measuring <br /> approximately 6"by 6" and cut to various lengths. At select locations along the face of <br /> the walls, tie-backs made of the same timber material extend into the bacl�'ill soil. The <br /> tie-backs and the timbers on the face aze pinned together with long spikes. <br /> The walls,particularly the main wall on the east side of the driveway,have been moving <br /> over the course of several yeazs.The timbers on the face of the mai.n wall have undergone <br /> significant deflection on the order of several inches,especially in the central sections of <br /> both tiers of the southeast-facing wall,as shown in Photo 1. Furthermore, the movement <br /> in the main wall has caused the blacktop portion of the driveway to settle about 4 inches - <br /> relative to the concrete portion of the driveway, as shown in Photo 2.This has made the <br /> walls undesirable from a struetural stability standpoint, and Mr. Sundby would lil:e to <br /> replace them. <br />