Appendix A Noise Study Report - Laserfiche WebLink

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Chapter 7. Future Noise Environment, Impacts, and Considered Abatement 7.1. Future Noise Environment and Impacts This NSR was prepared to determine the future traffic noise impacts at receptors along Fairview Street. Potential long-term noise impacts under the Future Build condition are solely from traffic noise. Traffic noise was evaluated for the worst -case traffic condition. Using coordinates obtained from the topographic maps, 92 receptor locations were evaluated in the model. Future traffic noise levels at all 92 receptor locations were determined using either the worst -case traffic operations (prior to speed degradation) or the 2040 a.m. peak -hour traffic volumes obtained from the Traffic Impact Analysis (LSA 2018), whichever were lower, as described in Section 5.3. Table B.1 in Appendix B summarizes the TNM results for the Existing, Future No Build, and Future Build conditions. The modeled future noise levels with the proposed Project were compared to the modeled existing noise levels (after calibration) from TNM 2.5 to determine whether a substantial noise increase would occur. The modeled future noise levels were also compared to the NAC to determine whether a traffic noise impact would occur. Traffic noise impacts occur when either of the following occurs: (1) the traffic noise level at a receptor location is predicted to "approach or exceed" its corresponding NAC or (2) the predicted traffic noise level is 12 dBA or more over the corresponding modeled existing noise level at the receptor locations analyzed. When traffic noise impacts occur, noise abatement measures must be considered. Of the 92 modeled receptors, 9 receptors under the Future Build condition would approach or exceed the NAC. No receptor would experience a substantial noise increase of 12 dBA or more over its corresponding modeled existing noise level under any scenario. The receptor locations listed below would be or would continue to be exposed to noise levels that either approach or exceed the NAC under Future Build conditions. • Receptor R-5: This receptor location represents an existing single-family residence on the northbound side of Fairview Street between Civic Center Drive and West 9th Street. Currently, a 4.7 ft high existing wall shields the residence. Fairview Street Improvements from 9th Street to 16th Street 39 and Bridge Replacement Project Noise Study Report