Item 28 - Public Hearing - ZOA No. 20204-01 South Coast Technology Center

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South Coast Technology Center Project CEQA Exemption 15183 As shown in Table 4.13-3 above, the nearest receptors to the Project Site could be exposed to temporary and intermittent construction noise levels ranging from approximately 51.8 to 66.3 dBA Leq at the nearest institutional use to the east and approximately 47.7 to 62.2 dBA Leq at the nearest residential uses to the south. As such, construction noise would not have the potential to exceed the FTA significance of threshold of 80 dBA Leq. In addition, according to SAMC Section 18-314(e), construction activities are exempt from the residential exterior noise control standards upon compliance with the permitted construction hours. As such, construction activities would be required to comply with the construction timings specified in SAMC Section 18-314(e), which restricts construction activities to the daytime hours of 7:00 a.m. to 8:00 p.m. Monday through Saturday. Compliance with the SAMC construction hours (RR NOI-2) would minimize impacts from construction noise. In addition, the Project is required to comply with the allowable interior noise levels specified in the California Building Code and the CALGreen noise standards pursuant to the requirements of RR NOI-1 and implement GPU PER MM N-1, which enforce measures for construction activities such as requiring the use of best -available noise control techniques, the use of hydraulic or electrical impact tools whenever possible, locating stationary equipment and stockpiling as far as feasible from sensitive receptors, limiting construction traffic to approved haul routes, and the use of temporary construction noise barriers. Therefore, construction impacts resulting from the proposed Project would be less than significant and would be less than the impacts disclosed in the GPU PER, which were determined to be significant and unavoidable despite inclusion of mitigation. Long-term Operational Impacts Mobile Noise Operation of the Project would generate vehicle trips on adjacent roadways, thereby potentially increasing vehicular noise in the vicinity of existing and proposed land uses. The most prominent source of mobile traffic noise in the Project vicinity is along Susan Street, Lake Center Drive, and MacArthur Boulevard. According to the California Department of Transportation, a doubling of traffic (100 percent increase) on a roadway would result in a perceptible increase in traffic noise levels (3 dBA).32 As discussed above the Project would generate approximately 386 net fewer total daily trips compared to the existing conditions.33 As such, as the Project generated traffic volumes would not exceed the traffic volumes of the existing condition, and would not generate additional vehicular noise along adjacent roadways. Project -related traffic noise impacts would be less than significant. On -Site Noise The operations of the proposed Project would be typical of a warehousing facility. Stationary noise sources associated with the Project would include noise generated from mechanical equipment, loading dock activities, and slow -moving trucks. Although the nearest noise sensitive use is the institutional use located approximately 100 feet to the east when measured from the property line, the distances to the nearest sensitive receptors would be greater when measured from the 32 California Department of Transportation, Technical Noise Supplement to the Traffic Noise Analysis Protocol, September 2013. 33 Note that the Trip Generation Assessment analyzed a project with three industrial buildings totaling 325,044 square feet. However, the total building square footage for the proposed project has been reduced to 313,244 square feet. July 2024 Page 81