Item 09 - Fairview Street Improvement Project

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Analysis Supporting Categorical Exemption nature of construction along the roadway, the distance between construction activities and sensitive receptors will vary. A distance of 44 feet from the roadway centerline to the nearest noise sensitive receptor was calculated using aerial photography and applied in the construction noise modeling. See Appendix F for model outputs. The anticipated short-term construction noise levels generated for the necessary equipment for each phase of construction are presented in Table 9. Table 9. Construction Average (dBA) Noise Levels at Nearest Receptors Construction Phase Estimated Exterior Construction Noise Level @ Closest Noise Sensitive Receptor (dBA Leq) Grubbing &Land Clearing 84.0 Grading &Excavation 91.7 Drainage, Utilities&Sub-Grade 90.6 Paving 87.1 Source: Construction noise levels were calculated by ECORP Consulting using the FHWA Roadway Noise Construction Model (FHWA 2006). Refer to Appendix F for Model Data Outputs. Notes:Construction equipment used during construction derived from CalEEMod. CalEEMod is designed to calculate air pollutant emissions from construction activity and contains default construction equipment and usage parameters for typical construction projects based on several construction surveys conducted in order to identify such parameters. Leq = The equivalent energy noise level, is the average acoustic energy content of noise for a stated period of time. Thus, the Leq of a time-varying noise and that of a steady noise are the same if they deliver the same acoustic energy to the ear during exposure. For evaluating community impacts,this rating scale does not vary, regardless of whether the noise occurs during the day or the night. As shown in Table 9, noise levels during Project construction could range from 84.0 dBA to 91.7 dBA at the nearest noise sensitive receptor. It is noted that this is modeled on a worst-case basis with all equipment operating simultaneously. Additionally, as the Projects proposes improvements along an existing roadway corridor, construction equipment is not fixed at one location but instead moves continuously along the Project Site.This movement means that the noise generated by the equipment is dispersed over a wide area rather than concentrated in a single spot. As the construction progresses, the distance between the equipmentand anysensitive receptors, such as residences, varies. This variation in proximity reduces the overall exposure of sensitive receptors to noise because the time spent by the equipment near anysingle receptor is limited.Thus,so long as construction occurswith the hours allowed by the City, a less than significant impact would occur. 4.13.1 Operational Noise The Project is proposing improvements to an existing roadway.Once construction is complete,the Project would not be a source of operational noise beyond current conditions. No impact would occur. ECORP Consulting, Inc. 19 January 2025 Fairview Street Widening Project 2024-088.03 9-31