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Chapter 2 Results of the Noise Study Report <br />.................. ................... <br />• NB No. 5: A 705 ft long barrier along the right-of-way on the northbound side of <br />Fairview Street between West 9th Street and West 12th Street was analyzed to <br />shield Receptors R-24, R-25, and R-40. <br />• NB No. 6: A 184 ft long barrier along the right-of-way and private property line <br />on the southbound side of Fairview Street between West 12th Street and the Santa <br />Ana River was analyzed to shield Receptor R-46. <br />2.3. Feasible Noise Barriers <br />Section 3 of the Protocol states that a minimum noise reduction of 5 dBA must be <br />achieved at the impacted receptors in order for the proposed noise abatement measure <br />to be considered feasible. Greater noise reductions are encouraged if they can be <br />reasonably achieved. Feasibility may also be restricted by the following factors: <br />(1) topography, (2) access requirement for driveways, (3) presence of local cross - <br />streets, (4) underground utilities, (5) other noise sources in the area, and (6) safety <br />considerations. <br />Table 2.1 summarizes the feasibility of the modeled noise barriers and lists the noise <br />barrier heights, approximate lengths, the noise attenuation, the number of benefited <br />units/receptors, the total reasonable allowance, beginning and ending station number, <br />and the beginning and ending top of wall elevation under the Future Build conditions. <br />Of the six modeled noise barriers evaluated for the Future Build conditions, all noise <br />barriers were determined to be feasible. <br />Fairview Street Improvements from 9th Street to 16th Street 23 <br />and Bridge Replacement Project Noise Abatement Decision Report <br />