Agenda - Council - 02/13/2007 - 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 become 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 goal of the City to address the preventative maintenance needs of its street system on a periodic basis. The goal of sealcoating 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 pavement structure as well as a like new surface. Streets receive a bituminous overlay when they are no longer able to benefit from a sealcoating operation. The construction and maintenance history of the pavements proposed for the 2007 Street Maintenance Program is presented in Appendix A. The 2007 program consists of eleven individual projects addressing the maintenance needs on 20.7 miles of City streets. Projects 07- 01 through 07 -07 which covers 15.3 miles of City streets, will receive a sealcoating preceded by sealing of cracks having widths which exceed one - quarter inch. Projects 07 -08 through 07 -11 • which involve 5.5 miles of street, will receive a one and one -half inch bituminous overlay of the existing bituminous pavement. The 2007 program includes the sealcoating of 3.5 miles of MSA street. Each project has been delineated so as to include streets of like construction and condition and having benefited lots of similar size. In general it has been the City policy to assess half of the cost of the street maintenance program. Appendix B contains a listing of the assessment policies the city has developed since 1990. Most often, projects are delineated by individual subdivisions or streets. Project 07 -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 escrow at the time these streets were constructed. There will be no assessments associated with this project. Projects 07 -02 through 07 -06 consist of sealcoating projects in various subdivisions which will be subject to the assessment policies of the city. Project 07 -07 is comprised of segments of Alpine Drive, Sunwood Drive and 167 Avenue. These are MSA streets and do not have the typical frontage densities that are found in residential subdivisions. This project will assess the properties fronting along these streets the average sealcoating assessment in accordance with Assessment Policy No 6. The remaining projects, 07 -08 through 07 -11, are bituminous overlay projects which have been aggregated by subdivision or similar lot sizes and will be assessed per unit in accordance with assessment policies of the city. The pavement distress on these proposed overlay projects • indicate that additional pavement strength is needed. —95—