Agenda - Council - 03/09/2010 - 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 scalcoating operation. The construction and maintenance history of the pavements proposed for the 2010 Street Maintenance Program is presented in Appendix A. The 2010 program consists of seven individual projects addressing the maintenance needs on 16.59 miles of City streets. Projects 10- 01 through 10 -03 which covers 11.44 miles of City streets, will receive a sealcoating preceded by sealing of cracks having widths which exceed one - quarter inch. Projects 10 -04 and 10 -07 which involve 5.15 miles of street, will receive a one and one -half inch bituminous overlay of the existing bituminous pavement. The 2010 program includes two projects which will address pavement maintenance on MSA streets. Project 10 -03 will include the sealcoating of 0.66 miles of MSA streets in Ramsey Town Center and Project 10 -07 will address the bituminous over lay of Alpine Drive on the west side of the City and Roanoke Street on the east side. The Alpine Drive project will include raised curbing at the railroad crossing to make it eligible for a quiet zone crossing. Project 10 -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 10 -02 consists of sealcoating streets which have been overlaid five years ago in 2005. These projects will be assessed under the City's new assessment policy for sealcoats explained in the section on financing. Project 10 -04 is comprised of segments of MSA streets within the Ramsey Town Center which include Zeolite street, Rhinestone Street and the bituminous paved sections of Sunwood Drive.This project will also include the repairs to the concrete sections of Sunwood Drive. Since these streets are receiving the first seal following construction, no assessments will be made for this project, but will be funded entirely with MSA funds. Project 10 -04 through 10 -06 are bituminous overlay projects which have been aggregated by subdivision or similar lot sizes and will be assessed per unit. The pavement distress on these proposed overlay projects indicate that additional pavement strength is needed. 2