Agenda - Council - 02/24/2020 - Laserfiche WebLink

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4.3 Bituminous Overlay Review Staff reviewed this project from the traditional overlay procedure. The rural sections in the Klemish, and Klemish & Flores neighborhood, has previously received an overlay. Staff proposed to complete a 6 to 7-foot edge mill of the pavement, down to 2-inches along the outside edge of the pavement, followed by a 2-inch bituminous overlay. This allows the edge of the pavement to match existing driveways, and builds up the crown of the road. The urban sections in the Sunfish Square, and Windemere Woods neighborhoods proposed to receive a 2-inch mill, followed by a 2-inch bituminous overlay. While reviewing the proposed streets, Staff discovered the pavement has deteriorated in several areas, beyond the point where a bituminous overlay is feasible. Staff felt this was not a cost-effective solution, given the poor condition of the streets, which in general are distressed beyond a typical bituminous overlay treatment. 4.4 3.5" Full -Depth Mill and Overlay Staff has spoken with consultants and contractors to help determine possible routes for dealing with variable depth bituminous section. One option would be to complete a 3.5" full -depth mill and overlay. This process would include removing all existing bituminous pavement, and where the pavement is less than 3.5" thick, remove class 5 as necessary, and pavement with our current standard of 3.5". In general this would leave the street with less class 5 than is standard today, but we would be able to do a standard 2" mill & overlay treatment in the future, and we would expect to have an anticipated life of 20 to 40 years. The advantage to removing the bituminous pavement versus milling, is it gives the contractor flexibility in the process. They may choose to mill what they can and get credit for the millings at the plant, however, this market can go up and down, and currently our understanding is millings credits are not high currently. In general, the streets are still at the stage where with maintenance, Staff feels they can be useful for 5 to 10 years to come, and the City's limited funds can be spent on streets which are better candidates for overlays, or are ready for reconstruction. An engineer's estimate was completed for the proposed project areas, with the exception of all of Klemish outside of Sodium Street. To complete the 3.5" full -depth mill and overlay as described above, the project costs are estimated to be $834,850.50. Staff felt this was not a cost-effective solution, and given the limited founding available there are other City streets which are at the proper condition for overlay treatments. 4.5 Full -Depth Reclamation In the recent past, including the 2017 and 2018 reconstruction programs, streets with similar conditions received full -depth reclamation treatments. This included grinding up the existing bituminous pavement and underlying aggregate base, after which 3.5-inches of the reclaimed material is removed with the remaining used as new aggregate base. Then 3.5-inches of new bituminous pavement is placed on top. In general, the streets are still at the stage where with Feasibility Report Pavement Overlay Improvements City of Ramsey Project No. 20-02 7