6.1. SR 05-19-2008 - Laserfiche WebLink

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III. PROPOSED IMPROVEMENTS The proposed improvement to the streets is to provide an overlay with 1 `/2 to 2 inches of bituminous surfacing. The streets can be overlaid while maintaining traffic, so there will be minimal disruption during construction. In addition, the improvements will consist of milling and/or removal of a small portion of existing bituminous in front of relatively flat driveways, and concrete curb and gutter to ensure they can be made to match properly with the newly overlaid street. Figure 2 (located at the end of the report) shows the relationship between life of service and strength of pavement. This graph shows that once a street reaches 75 percent of years of service the pavement strength rapidly drops and the cost to maintain the road increases. By overlaying these roads, the strength and life of the road will be increased. The overlay will seal the cracking in intermediate stages. The overlay will also fill the low areas in the pavement, which collect water and decrease the life of the pavement. Existing transverse cracks, which are caused by freeze-thaw cycles, will likely reflect through the overlay in the future. As with all previous bituminous overlay projects, the City Street Division will patch any severely damaged areas before the overlay. The contract for the street work will restore the gravel shoulders after the overlay. IV. EASEMENTS AND PERMITS The right-of--way width for these streets is generally 60 feet and is adequate for these improvements. No work is proposed outside of the right-of--way. V. NECESSITY AND COST-EFFECTIVENESS The streets being reviewed are in need of repair. The project is necessary to provide the residents of these areas with a safe and adequate public transportation system. If the overlay is not done in a timely fashion, the roads will continue to deteriorate and reach a point where an overlay will not be a feasible alternative. The project will minimize future maintenance costs and increase traffic safety. The size of the project will ensure competitive bidding; from this standpoint, the project is cost- effective. 10