Appendix A Noise Study Report - Laserfiche WebLink

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ter 7. Future Noise Environment, Impacts, and Considered Abatement The design of noise barriers presented in this report is preliminary and has been conducted at a level appropriate for environmental review and not for final design of the project. Preliminary information on the physical location, length, and height of noise barriers is provided in this report. If pertinent parameters change substantially during the final project design, preliminary noise barrier designs may be modified or eliminated from the final project. A final decision on the construction of the noise abatement will be made upon completion of the project design. 7.2.1. Future Build The following is a discussion of the noise abatement measures considered for the Future Build condition where traffic noise impacts are predicted. 7.2.1.1. Noise Barrier No. 1 A 169 ft long barrier (STA 36+55 to STA 37+31) along the private property line on the northbound side of Fairview Street between Civic Center Drive and 9th Street was analyzed to shield Receptor R-5. Table B.1 in Appendix B shows the results of the analysis. NB No. 1 was evaluated from 6 ft to 16 ft high in 2 ft increments. Figure 7-1 shows the location of NB No. 1. Table 7.1 lists the highest noise barrier reduction, the number of benefited residences, the reasonable allowance per benefited residence, and the total reasonable allowance for each barrier height. The minimum feasible barrier height is 8 ft. Table 7.1. Summary of Reasonableness Allowances for Noise Barrier No. 1 Build Alternative with Barrier' 6 ft Barrier 8 ft Barrier 1 o ft Barrier 12 ft Barrier 14 ft Barrier 16 ft Barrier Highest Noise Barrier Reduction dB 3 5 7 8 9 10 Number of Benefited Receptors/Units 0 1 1 1 1 1 Reasonable Allowance per Benefited Rece for/Unite $0 $95,000 $95,000 $95,000 $95,000 $95,000 Total Reasonable Allowance $0 $95,000 $95,000 $95,000 $95,000 $95,000 Source: Compiled by LSA (2018). ' A NADR will be prepared to identify the noise barrier construction cost information and the noise barriers that are reasonable from a cost perspective. 2 The cost consideration in the reasonableness determination of noise abatement is based on a 2018 allowance per benefited receptor/unit of $95,000. dB = decibels ft = foot/feet NADR = Noise Abatement Decision Report 42 Fairview Street Improvements from 9th Street to 16th Street and Bridge Replacement Project Noise Study Report