Agenda - Council - 02/08/2000 - Laserfiche WebLink

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BACKGROUND Routine maintenance is the most economical method for safeguarding the public investment in bituminous paved streets. The bituminous street surface weakens as a result of sunlight exposure, precipitation, freeze/thaw cycles and traffic loading. As a result, the asphaltic components of the bituminous becomes brittle and susceptible to cracking. Once water is able to penetrate surface cracks into the road base, pavement deteriorates at an accelerating pace. To avoid this rapid deterioration, it is the acknowledged goal of the City to address the maintenance needs of its street system on a periodic basis.' Table 1 provides the history of the pavements proposed for the 2000 Street Maintenance Program. The 2000 program consists of five individual projects covering 9.32 miles of street. These streets will receive a one and one-half inch bituminous over/ay of the existing bitumious pavement. An overlay provides additional strength to the pavement structure as well as a like- new surface. Each project has been delineated so as to include streets of like constuction and condition and lots of similar size. Most often, projects are delineated by individual subdivision. The streets scheduled for maintenance are illustrated in Appendix B. All streets proposed for the 2000 program have received a preliminary survey by the City Engineer and Public Works Supervisor and have been evaluated at a pavement rating of 3. I I I I I I I PROJECT QUANTITIES AND COSTS Table 2 provides a detailed breakdown of street lengths, widths and pavement areas for each project. Individual projects have been generally aggregated by subdivision such that the majority of the properties benefitted within each project have similar characteristics. All of the 2000 street maintenance projects consist of applying one and one-half inch bitumious overlays onto the existing pavement. The pavement distress on these proposed overlay projects indicate that additional pavement strength is needed. Prior to the overlay, failed areas will be removed and patched by City forces. The existing pavement will be tack coated and a machine laid one and one-half inch overlay will be placed. Existing driveways will be feathered to match the new pavement, or in cases where there is a concrete curb and gutter, the pavement edges will be milled to allow for the overlay material. The overlay will be shouldered with topsoil and seeded to eliminate the drop off at the pavement edge formed by the overlay. Table 2 also contains overlay project quantities. Previous years tow bid and estimated 2000 unit prices for overlays are as follows: Overlay Program S/Ton I I I I I I I 1993 Actual $19.00 1994 Actual $21.00 1995 Actual $22.50 1997 Actual $27.25 1998 Actual $23.06 1999 Actual $24.60 2000 Estimate $26.00 2 m m I !