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Chapter 7. Future Noise Environment, Impacts, and Considered Abatement <br />7.2.1.5. Noise Barrier No. 5 <br />A 705 ft long barrier (STA 40+45 to STA 42+14) along the private property line on <br />the northbound side of Fairview Street between Civic Center Drive and the Santa Ana <br />River was analyzed to shield Receptors R-24, R-25, and R-40. Table B.1 in <br />Appendix B shows the results of the analysis. NB No. 5 was evaluated from 6 ft to 16 <br />ft high in 2 ft increments. Figure 7-1 shows the location of NB No. 5. Table 7.5 lists <br />the highest noise barrier reduction, the number of benefited residences, the reasonable <br />allowance per benefited residence, and the total reasonable allowance for each barrier <br />height. The minimum feasible barrier height is 6 ft. <br />Table 7.5. Summary of Reasonableness Allowances for <br />Noise Barrier No. 5 <br />Build Alternative with Barrier' <br />6 ft <br />Barrier <br />8 ft <br />Barrier <br />1 o ft <br />Barrier <br />12 ft <br />Barrier <br />14 ft <br />Barrier <br />16 ft <br />Barrier <br />Highest Noise Barrier Reduction dB <br />6 <br />9 <br />11 <br />13 <br />14 <br />16 <br />Number of Benefited Receptors/Units <br />2 <br />3 <br />3 <br />5 <br />7 <br />7 <br />Reasonable Allowance Per Benefited <br />Receptor/Unit <br />$95,000 <br />$95,000 <br />$95,000 <br />$95,000 <br />$95,000 <br />$95,000 <br />Total Reasonable Allowance <br />$190,000 <br />$285,000 <br />$285,000 <br />$475,000 <br />$665,000 <br />$665,000 <br />Source: Compiled by LSA (2018). <br />' A NADR will be prepared to identify the noise barrier construction cost information and the noise barriers that are <br />reasonable from a cost perspective. <br />z The cost consideration in the reasonableness determination of noise abatement is based on a 2018 allowance <br />per benefited receptor/unit of $95,000. <br />dB = decibels <br />ft = foot/feet <br />NADR = Noise Abatement Decision Report <br />7.2.1.6. Noise Barrier No. 6 <br />A 184 ft long barrier (STA 47+16 to STA 48+57) along the private property line on <br />the southbound side of Fairview Street between West 12th Street and the Santa Ana <br />River was analyzed to shield Receptor R-46. Table B.1 in Appendix B shows the <br />results of the analysis. NB No. 6 was evaluated from 6 ft to 16 ft high in 2 ft <br />increments. Figure 7-1 shows the location of NB No. 6. Table 7.6 lists the highest <br />noise barrier reduction, the number of benefited residences, the reasonable allowance <br />per benefited residence, and the total reasonable allowance for each barrier height. <br />The minimum feasible barrier height is 10 ft. <br />Fairview Street Improvements from 9th Street to 16th Street 49 <br />and Bridge Replacement Project Noise Study Report <br />