01-22-07 Item 2B, Five Year CIP Update

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Pavement Management Program (PMP) At the May Work Session, staff presented preliminary results from GoodPointe Technology in relation to the City's pavement management and maintenance. Council indicated that of the scenarios presented, scenario 3, based on the desire to increase the overall PCI (Pavement Condition Index) rating to 75, was most desirable. Staff has proceeded to determine PMP projects for the next five years that incorporates GoodPointe's recommendations. Attached is a map with proposed improvements over the next five years. CIP Discussion ]11812007 Page 2 2007-201 I Proiects Staff considered GoodPointe's suggestions for improvements in conjunction with the following factors: whether the street has concrete curb and gutter, and the needs for watermain, sanitary sewer or storm sewer improvements. Staff also visually inspected the streets to confirm or revise the recommended maintenance strategy. Many of the streets that were listed as mill and overlay candidates were streets that do not have curb and gutter, are at least 30 years old and likely have thin layers of bituminous with an insufficient base. If these streets were milled, it is likely that the milling procedure would result in the removal of the asphalt in its entirety, exposing the insufficient subgrade, requiring the scope of the project to change from a mill and overlay to a complete reconstruct. These streets often were also found to have little to no storm sewer and poor drainage due to the lack of curb and gutter. While staff felt that several of these streets were not candidates for mill and overlay, the pavement condition was found to be suitable for a seaIcoat. SeaIcoating these streets would extend the life of the pavement long enough so that we could address streets that are candidates for mill and overlays and do have curb and gutter and a sufficient subgrade. As with all sealcoats, some minor maintenance would be required, such as crack sealing, patching, and leveling. Historically, streets have been sealcoated one to two years after reconstruction or mill and overlay. GoodPointe's analysis did not use this philosophy; recommendations for sealcoating occurred when the PCI of a street indicated the need for minor maintenance. Staff utilized this information, as well as visual inspections, to determine which streets were good candidates for seaIcoats. During the visual inspection of the streets, staff found that some streets with concrete curb and gutter that were listed as mill and overlay candidates had more distresses than typically recommended for a mill and overlay. The cracks and distresses present would reflect through the overlay within a few years after paving. Soil borings can be taken to determine the presence of a sufficient base. If one exists, these streets are good candidates for full pavement replacement. This is a procedure where the base and curb and gutter remain in place, and only the existing pavement is removed and replaced. Streets recommended for this type of improvement are shown as mill and overlay streets on the attached map.