2024-053 - Final Supplemental for The Related Bristol Specific Plan Project

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exceed the 85 dBA construction thresholds for commercial uses (soil hauling would not occur along residential streets) and roadway noise levels would not increase ambient noise levels above the perceptible range (3.0 dBA) for any of the construction phases. Therefore, a less than significant impact would occur. Additionally, the GPU FEIR Mitigation Measure N-1 requires construction traffic use City approved haul routes to the extent feasible. Thus, ensuring that construction traffic would not use residential roadways (Draft Supplemental EIR at pp. 5.9-18 through 5.9-19). Operation Onsite operational Noise. Noise generated by the Project would occur from stationary equipment such as heating, ventilation, and air conditioning (HVAC) units that would be installed for the new development, use of parking facilities, trash removal activity, and activity at outdoor gathering areas. Based on these typical noise levels, operation of the Project would not result in an exceedance of the City's Municipal Code Section 18-313 noise standards. Also, the City's building and plan check permitting process includes verification that the location of operational noise sources would not result in an exceedance of the municipal code standards. At the closest sensitive receptor, approximately 130 feet away, mechanical equipment noise levels would attenuate to 43.7 dBA, which is below the City's ambient noise standards of 55 dBA for residential receptors and below the measured ambient levels ranging from 58.4 to 71.0 dBA (refer to Draft Supplemental EIR Table 5.9-4). Operation of mechanical equipment would not increase ambient noise levels beyond the acceptable compatible land use noise levels. Therefore, the proposed Project would result in a less than significant impact related to stationary noise levels. Thus, the City's standards development permitting process would ensure that the proposed Project would not generate on -site operational noise that would exceed noise standards. Therefore, impacts would be less than significant (Draft Supplemental EIR at pp. 5.9-19 through 5.9-21 ). Onsite Traffic operational Noise. Future residents at the Project site would be exposed to mobile traffic noise along Bristol Street, MacArthur Boulevard, Sunflower Avenue, and Plaza Drive. Table 5.9-17 shows that noise levels along these roadways would be up to 68.8 dBA (along Bristol Street from MacArthur Boulevard to Callen's Common) at 100 feet from the roadway centerline. At 70 feet, traffic noise would be approximately 71 dBA. However, this does not account for intervening structures and changes in altitude, as residences would be above commercial and retail uses. Therefore, the potential for the proposed Project to exceed the City's 65 dBA exterior and 45 dBA interior General Plan noise standards (based on an outdoor to indoor attenuation rate of 25 dB) cannot be excluded, and noise -reduction features, acoustical designs for the proposed residential buildings, and enforcement of the California Uniform Building Code would be required. However, Condition of Approval N0I-1 is included to require a detailed acoustical study demonstrating that all residential units would meet the City's General Plan 65 dBA exterior and 45 dBA interior noise standards by incorporating applicable noise reduction features. Compliance with Condition of Approval N0I-1 would ensure that the proposed Project meets the applicable City and state standards (Draft Supplemental EIR at pp. 5.9-13-29 through 5.9-30). Condition of Approval: COA N-1: On site Traffic Noise. Prior to issuance of building permits for Phase 1, Phase 2, and Phase 3, a detailed acoustical study based on architectural plans shall be prepared by a qualified acoustical consultant to demonstrate compliance with General Plan Noise Element Standards. The