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~L~RIH~ ~ ASS Memo TO: Honorable Mayor and City Council Members FROM: Lee Elfering, City Engineer DATE: May 27, 2009 RE: Westwind Drive and Windrow Drive Improvements This memo is to provide additional information on the cost implications of a full bituminous section improvement of Westwind Drive and Windrow Drive. The original project improvement was based on the method listed on the City's street management plan and a review of the conditions this winter. Upon closer inspection of the pavement condition this spring we feel that a more extensive pavement rehabilitation is necessary. Nearly the entire length of Westwind Drive has more advanced cracking than originally reviewed and the middle two thirds of Windrow Drive is in similar but slightly better condition. In some areas we feel that the milling process will undesirably pull up the bituminous that is to remain in-place resulting in more patching. In areas that do hold together during the milling process we would expect significant reflective cracking through the new bituminous layer in only a few years. Therefore, we have reviewed the option of full bituminous removal and repaving to provide a more uniform and cost effective rehabilitation of the streets. The estimated cost presented to the residents at the time of the public hearing for the mill and overlay of the two streets was $271,000 of which $135,000 would have been assessable. This equated to an assessment per front foot of $23.97 and it was determined that at those costs the project should move forward. Based on the bid received and the amount of patching on the bid, the cost of the mill and overlay is estimated at approximately $166,000 of which $83,000 would be assessable, equating to an assessment per front foot of approximately $14.68. The new proposal for a full removal and repaving of both bituminous layers is estimated at $206,500.00 of which $103,250 would be assessable, equating to an assessment per front foot of approximately $18.26. Cost is always a concern with any project, but more important is the return that will be seen for the money spent. It is our opinion that the uniform street section that will be achieved by the full removal and repaving justifies the additional cost. The assessments to the residents are still estimated to be approximately 24% lower than originally proposed and the full paving will provide longer life than the mill and overlay improvement. We therefore, would recommend that the City modify the improvement methods to a full removal. of the pavement and repaving of both bituminous lifts. If you have any questions regarding this issue please call me at (763) 780-0450 extension 13. 10062 Flanders Court NE -Blaine, MN 55449 - Ph: (763) 780-0450 Fax (763) 780-0452 Z:\PROJ\120119E - 2009 Street antl Utility Reconstruction\0071\Mill and Overlay\Memo-052709-Hanson (Wes[wintl-wintlrow).tloc