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Chapter 5. Study Methods and Procedures <br />abatement must be considered for reasonableness and feasibility as required by <br />23 CFR 772 and the Protocol. <br />According to the Protocol, an abatement measure is considered acoustically feasible if <br />a minimum noise reduction of 5 dBA at impacted receptor locations is predicted with <br />implementation of the abatement measure. In addition, barriers should be designed to <br />intercept the line of sight from the exhaust stack of a truck to the first tier of receptors <br />as required by the Caltrans Highway Design Manual (2015), Chapter 1100. Other <br />factors that affect feasibility include topography, access requirements for driveways <br />and ramps, presence of local cross -streets, utility conflicts, other noise sources in the <br />area, and safety considerations. The overall reasonableness of noise abatement is <br />determined by considering factors such as the construction cost of the barrier, the <br />noise reduction design goal (a noise level reduction of 7 dBA or more at one or more <br />benefited receptors), and the viewpoints of benefited receptors (including property <br />owners and residents of the benefited receptors). <br />The Protocol defines the procedure for assessing the reasonableness of noise barriers <br />from a cost perspective. A cost allowance per residence is assigned to each benefited <br />residence (i.e., residences that receive at least 5 dBA of noise reduction from a noise <br />barrier). The 2018 allowance is $95,000 per benefited residence. Total allowances are <br />calculated by multiplying the cost allowance per residence by the number of benefited <br />residences. <br />Fairview Street Improvements from 9th Street to 16th Street 29 <br />and Bridge Replacement Project Noise Study Report <br />