Agenda - Council - 02/08/2005 - Laserfiche WebLink

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BACKGROUND Routine maintenance is the most economical method for safeguarding tlie public investment biturninous paved streets. The bituminouS street isurface 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, pa~vement deteriorates at an accelerating pace. TO avoid this rapid deterioration, ii is the g0al of the City to address the preventative maintenance needs of its street system on a pedodi_c baSisl The construction and maintertance history of the pavements Pr, oposed for. the 2005 Street Maintenance Program is presented in Appendix A. The 2005 program consists of eig!~t indiVidual projects. Projects 05-01 tln'ough 05-05 which includes 13.55 miles of City Streets, Will receive a sealcoating preceded by sealing of cracks having widths which exceed one-quarter inch: Projects 05-06 and 05-08 which involve 6,95 miles of street, will receive !a one and. one-half inch bituminous overlay of the existing bitm-ninous pavementi The goal ofsealcoating is to restore the imperviousness of the pavement. Eliminating water and pavement :oxidation retains the flexibility of bituminOus pavement. Sealcoating also adds skid resistance as a secondary benefit. Unlike sealcoats which only preserve the flexibility of the bituminous; an overlay provides additional strength to the pavernent structure as:well as a like new Surface. Each project has been delineated so as to include streets of like construction and condition and having benefited lots of similar size. Most often, projects are delineated by individual subdivisions or streets. Project 05-01 involves the first sealcoating of recently constructed streets. These streets have been grouped into a single project because funding for this first sealcoat is being provided by a developer escrowl There will be no assessments associated with this project. Project 05-02 consists of sealcoating a section in the southeastern portion of the city which is comprised of 29 individual subdivisions having urban sized lots. This project also includes a few segments of streets in unplatted areas adjacent to these subdivisions. The remaining sealcoat projects, 05-03 through 05-05, consist of single subdivision or pairs of subdivisions which-have similar areas of street Surface per benefited lot. Project 05-06 through 05-08 are overlay projects which consist of grouPs of subdivision or :unplatted areas-having similar areas of street surfac~ per benefited lot. The streets scheduled for maintenance are illuStrated in Figure 1. All streets prOposed for the program have received a preliminary survey by the City Engineer and Public Works SUpervisor. A post winter survey will be conducted prior to awarding bids in June. Appropriate project adjustments will be made if any of the Scheduled projects are deemed to be inappropriate for sealcoating due to advanced deterioration. 1