Minutes - Public Works Committee - 07/15/2003

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permanent solution to this situation is necessary. Earlier, staffhad advised the Thorson's that the problem could be addressed along with the access road from T.H. #47 into Elmcrest Park, however, within the past y ear it has become apparent that the park access will follow a northerly route to 167th Avenue. Staff presented three options to address this drainage issue as follows: Alternative A: A flared end storm sewer would accept the runoff delivered by the culvert across T.H. //47 and be transmitted across the golf course to the golf course pond. A culvert would be placed across 164th Lane to reduce the amount of runoff delivered to the ponding area in front of 5230 and 5810. The construction cost associated with the piping for this alternative is estimated to be $31,000. In addition, however, an easement would be needed from the golf course to facilitate this alternative. Depending on how close the easement would be to the south golf course property line, tree loss may also be an impact. Survey work would be needed to determine if there was a conflict with the gas line. Alternative B: Alternative B would utilize a flared end storm sewer pipe picking up flow from the T.H. #47 culvert and transmitting it south and then east along 164th Lane, to a side yard easement line between 5821 and 5761, and then into the golf course pond. A lead across 164th Lane would drain the secondary ponding problem as well. The construction cost of this alternative was estimated to be $44,000, which included the replacement of half of 164th Lane. All necessary easements for this transmission line associated with this alternative are currently held by the City, however, the City Attorney has advised that obtaining easements on waiver from properties boarding the pond, including the golf course would be desirable, since the only portion of the pond covered by the easement includes the twenty feet along the common border between 5821 and 5761. A temporary easement for construction would also be helpful. There would be tree loss impact along the 5821 and 5761 property line, since it is heavily wooded. This alternative would also allow the ponded water on 5830 and 5810 to be drained entirely. Similar to Alternative A, there may be a conflict with the gas line. Alternative C: The Thorson's have had a significant reduction in the use of their backyard resulting from the existing drainage, and have expressed a desire for some form of immediate relief. The Thorson's have considered placing a four-inch tile line across their backyard. There appears to be a swale through the wooded areas flowing through the rear property area of 5821 to the east and into the golf course pond. The cost of this project undertaken by the Thorson's is estimated to be $500. In the Thorson's letter they have requested consideration by the City in participating with the expense. Councilmember Cook inquired if any of the situation was being caused by the dewatering activity occurring along T.H. #47. City Engineer Jankowski replied no. Councihnember Elvig inqtlired if staff had any indication if the golf course would cooperate with the necessary easement for alternative A. Public Works Committee/July 15, 2003 Page 2 of 6