Appendix A Noise Study Report - Laserfiche WebLink

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Chapter 7. Future Noise Environment, Impacts, and Considered Abatement 772(13)(c) and 772(15)(c), federal funding may be used for the following abatement measures: • Construction of noise barriers, including acquisition of property rights, either within or outside the highway right-of-way. • Traffic management measures including, but not limited to, traffic control devices and signing for prohibition of certain vehicle types, time -use restrictions for certain vehicle types, modified speed limits, and exclusive lane designations. • Alteration of horizontal and vertical alignments. • Acquisition of real property or interests therein (predominantly unimproved property) to serve as a buffer zone to preempt development that would be adversely impacted by traffic noise. Noise barriers are the only form of noise abatement considered for this project. Each noise barrier has been evaluated for feasibility based on achievable noise reduction. For each noise barrier found to be acoustically feasible, reasonable cost allowances were calculated by multiplying the number of benefited receptors by $95,000. Table B.1 in Appendix B summarizes the results at receptor locations for the noise barriers evaluated in detail for this project. Table B.1 shows predicted noise levels, insertion loss, and the number of benefited receptors at analyzed barrier heights for the Future Build condition. For any noise barrier to be considered reasonable from a cost perspective, the estimated cost of the noise barrier should be equal to or less than the total cost allowance calculated for the barrier. The cost calculations of the noise barrier must include all items appropriate and necessary for its construction (e.g., traffic control, drainage modification, retaining walls, landscaping for graffiti abatement, and right- of-way costs). Construction cost estimates are not provided in this NSR but will be presented in the Noise Abatement Decision Report (NADR). The NADR is a design responsibility and is prepared to compile information from the NSR, other relevant environmental studies, and design considerations into a single comprehensive document before public review of the project. The NADR is prepared by the project engineer after completion of the NSR and prior to publication of the draft environmental document. The NADR includes noise abatement construction cost estimates that have been prepared and signed by the project engineer based on site -specific conditions. Construction cost estimates are compared to reasonableness allowances in the NADR to identify which wall configurations are reasonable from a cost perspective. Fairview Street Improvements from 9th Street to 16th Street 41 and Bridge Replacement Project Noise Study Report