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?t 3 #onora tle Mayo <br />0 , Jerry Bourdon <br />in, November 4, 1994 <br />Dann Lane Meta <br />INTRODUCTION <br />ouncil <br />ak�nestraa <br />iiosene ... <br />Anderliik $ <br />Associates; <br />The Dianna Lane Retaining Walls are beginning to fail. This memo provides information <br />concerning improvement options. <br />BACKGROUND <br />The retaining walls are constructed of treated wood timbers. The wood is beginning to rot <br />and the wall is structurally failing (bowing and tipping). <br />The retaining wall was constructed by the developer of the adjacent property in late 1970. <br />The walls are physically located within the city right -of -way. The City accepted the Dianna <br />Lane infrastructure in 1980. It has not been definitively determined that the City accepted <br />the retaining walls as its maintenance responsibility. The information herein is presented <br />irrespective of this issue. <br />Council has discussed the issue on previous occasions. The information herein is provided <br />to assist with further Council discussions of this issue. <br />CORRECTIVE OPTIONS <br />Attached to this memo are x- section drawings which illustrate in 'but away" view the existing <br />and optional proposed conditions. <br />We suggest consideration of two corrective options as described in the following. <br />Option A: Remove existing wall and construct a new wall. <br />Details: Suggest wall replacement to be a "Keystone" type retaining wall. <br />Advantages: A Keystone type wall is aesthetically pleasing and will provide <br />a low maintenance facility with a probable life of ± 25 years or more. <br />Disadvantages: Cost. <br />Page 136 <br />