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Memo tLFCRING ASSO(IATS TO: Mayor Blesener & Members of the City Council FROM: Lee Elfering, City Engineer DATE: April 7, 2005 RE: 2489 McMenemy Street Installation of Storm Sewer Culvert Drainage Improvements A drainage concern was brought to the City's attention between two residential properties at 2489 and 2481 McMenemy Street late last fall. The drainage from both driveways and a portion of McMenemy Street drain back down one resident's driveway, partially through a small 4 -inch diameter pipe. The storm water runoff then ponds in the yard next to the garage until high enough to be conveyed overland to a drainage swale on the back side of the properties. As a result of the drainage down the driveway, icing is an issue in the winter. The ponding creates issues year round but is exacerbated in the winter due to the ice. Due to the fact that no drainage and utility easement exists to allow for conveyance of this water down the residents driveway and that some of this drainage is from the public street, we felt that it was the city's responsibility to correct the problem. Due to site limitations as a result of existing improvements, which consist of driveways and retaining walls, on both properties near the lot line the most cost effective means for providing a drainage outlet is to directional bore a 6 -inch pipe. In discussions with the property owner at 2489 McMenemy Street, they have indicated that they would be willing to grant any easement for installation and existence of a pipe on their property along the lot line to solve the problem. There is sufficient grade to install the pipe at a minimum grade of 3.0 %. The solution would consist of a small rain water garden within the right -of -way on McMenemy Street and then installation of a storm sewer pipe from this point to the drainage swale along the back lot line of both lots. The storm sewer pipe would be directionally drilled by an outside contractor and the rain water garden would be constructed by City forces. We received quotes from several contractors that specialize in directional boring late last fall, but due to the need for winter season construction, bids were higher than anticipated. Therefore, we elected to delay the work until spring in an attempt to get a more competitive price for the work. 10062 Flanders Court NE, Blaine, MN 55449 — Ph: (763) 780 -0450 — Fax: (763) 780 -0452 C: \Docurnents and Settings \kathy.glanzer\Local Settings \Temporary Internet Files \OLK2D \Memo - 040706- CC.2489 McMenemy.doc MC lath