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Mr. Robert Owens <br />GME Project Mo. 3766 <br />Results <br />October 19, 1992 <br />On October 8, 1992, the writer and an Engineering Technician obtained <br />elevations along three survey lines extending from the existing house <br />perpendicular to the slope and ending at the edge of Lake Minnetonka. <br />Line 1 was established approximately 20 feet south of the north edge of <br />the house; Line 2 was established approximately 50 feet south of the <br />north edge of the house; and Line 3 was established approximately 75 <br />feet south of t.he north edge of the house. Attached are the cross <br />sections based on these elevations. Line 2 was established through the <br />existing failed tone within the slope. <br />As can be seen from the attachea cross sections, the slope is divided <br />into approximately two portions. An upper tone having a sideslope of <br />approximately 1.1 to 1.5 horizontal:! vertical; and a lower zone having <br />a flatter slope of approximately 2 to 3 horizontal:! vertical. Based <br />on the preliminary data, it is our opinion that it is the upper steeper <br />zone that is marginally stable. <br />Based on our engineering assessment of the cross sections, we submit <br />three possible remedial schemes: <br />1. <br />w • <br />3 . <br />Reshape the entire slope to form a <br />flatter, more stable configuration <br />Construct a double retaining wall <br />eliminating the existing sideslope <br />Combination slope vith reshaping and a <br />single retaining wail <br />We have included preliminary drawings outlining these possible remedial <br />measures. After discussing these with you, we understand that <br />reshaping the entire slope is undesirable since this would require <br />losing a large amount of ground and trees. If one of the two remaining <br />schemes is chosen for slope repair, it is important that the existing <br />fill soil be removed and replaced in a properly compacted condition. <br />The natural soils should be benched, and the fill placed and compacted <br />in horizontal lifts, thereby eJ.iminating the creation of a potential <br />failure surface between the fill and natural soils. In addition, the <br />use of a geote:<tile behind the wall would be beneficial for <br />stabilization. It should be noted that alternate 3 would be less <br />costly than alternate 2, since a rouah budget estimated cost for tied <br />back timber retaining walls is about $10 per square foot of wall.