2011-07-27 Handouts @ Budget Work Session

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Thin Overlay Cost Assumptions: The following are the assumptions considered in providing the most cost effective long term life cycle of asphalt roads in Centerville. The thin overly (1") compacted assumes that the roadway will be overlayed prior to any major deterioration or cracking of the roadway based upon life cycles of 15-18 years. The quality of binder and aggregate will be carefully observed. Overlay mix design will incorporate smaller aggregate creating a more dense asphalt pavement. The tack coat used will be heavier and provide 100% coverage to prevent slippage and separation due to heavy traffic or snowplow operations. Each street section for overlay will be inspected for wear. The surface prep work of full width milling or just edge milling will depend on the road surface prior to the overlay. Roadways with significant wear and deterioration will require full milling of the surface and possibly a thicker overlay of up to 2". Determination of the extent of work and mix design will utilize expert opinions from MN DOT staff and local representatives from the Minnesota Asphalt Pavement Association , along with consulting with the city's consulting engineer and public works director. IYs recommended the city purchase the designed asphalt mix directly from the plant and will be responsible for quality control of this product. Outside testing will be used as necessary to ensure , the product meets the expectations of the city. i �� tt is anticipated that all work will be completed in July or August to take best advantage of the warm weather conditions to maximize the adhesion of the thin overlay to the existing roadway. Temperature placement of the asphalt is critical and will be continuously observed by qualified city staff or others as directed. The city is planning on overlaying all streets per the attached schedule, but the exact year for I each will be subject to the current condition of the road and budget constraints. Current cost estimates are as follows: 6' edge milling $2.00 LF 2.00 LF Tack $0.12 SY .40 LF Sweeping $0.30 SY 1.00 LF Pave 1" compacted $6.65 SY 22.15 LF Total 25.55 LF Costs for 1" compacted are anticipated to be $26.00 LF with 20% budgeted annually for minor repairs / adjustments to curbing and irons-2" cost anticipated to be $40.00 LF. The overall City budget also incorporates roughly $20,000 for engineering expenses associated with the project. Direct inspection costs would be absorbed in the public works budget. Analysis Prepared by: Paul Palzer