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� � � <br /> . �� <br /> g-Zy-� ` <br /> Barr Engineering Company <br /> 4700 West 77th Street• Minneapolis, MN 55435-4803 <br /> Phone: 952-832-2600 • Fax: 952-832-2601 � <br /> B��� 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 Wail Evafuation <br /> Dear Mr. Sundby: <br /> Introduction <br /> Barr Engineering is pleased to present the following findings and recommendations <br /> regarding the retaining wall evaluation at the Sundby residence. <br /> Two timber 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 /> approximately 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 are made of treated timbers measurin� <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 backfill soil. The <br /> tie-backs and the timbers on the face are 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 years. The timbers on the face of the main 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 structural stability standpoint, and Mr. Sundby would like to <br /> replace them. <br />