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

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South Coast Technology Center Project CEQA Exemption 15183 RR E-5 Development under the General Plan Update shall support the goals of the renewables portfolio standard, SB 350, and SB 100 to achieve a tiered increase in the use of renewable energy to 60 percent by 2030, and 100 percent by 2045. RR E-7 Development under the General Plan Update shall be in compliance with state and local solid waste regulations including AB 939, AB 341, AB 1327, AB 1826, and Section 5.408 of 2016 California Green Building Standards Code (California Code of Regulations, Title 24, Part 11). 4.7 Geology and Soils 4.7.1 GPU PEIR Findings The GPU PEIR concluded that future development under the General Plan Update would be subject to potential seismic -related hazards including strong seismic ground shaking, seismic - related ground failure (including liquefaction), and landslides. Further, development associated with the General Plan Update could result in unstable geologic unit or soil conditions, including soil erosion, expansive soils, settlement and collapse, and subsidence. However, implementation of RR G-1, through RR G-3 would reduce impacts to less than significant levels. Specifically, RR G-1 and RR G-2 require development to comply with the most recent version of the California Building Code and SAMC Chapter 8, Buildings and Structures, and RR G-3 requires all buildings or structures within the City that require plumbing fixtures to be connected to a public sewer per SAMC Section 39-51, Mandatory Connections. The GPU PEIR also concluded that development under the General Plan Update could impact known and unknown paleontological resources through grading and construction activities of undeveloped areas or redevelopment that requires more intensive soil excavation than in the past. Therefore, GPU PEIR MM GEO-1 through MM GEO-3 require monitoring based on the sensitivity level of sites for paleontological resources. Overall, the GPU PEIR concluded that implementation of regulatory requirements and MM GEO- 1 through MM GEO-3 would reduce geology and soil impacts to less than significant levels. 4.7.2 Project Analysis The following section evaluates potential impacts to geology and soils that would result from the construction and operation of the proposed Project. The analysis is primarily based upon Attachment E-1, Geotechnical Design Report, Attachment E-2, Geotechnical Review of Shallow Groundwater and Potential Dewaterina durina Gradina and Construction (Groundwater Memorandum), and Attachment C, Cultural and Paleontological Resources Identification Memorandum (Cultural Memorandum). The Project Site is located in a seismically active area, as is most of southern California. However, the Project Site is not located within a state -designated Alquist-Priolo Fault Hazard Zone. No active faults are known to cross the Project Site. The nearest fault to the Project Site is the San Joaquin Hills Blind Thrust Fault, located approximately 2.6 miles south of the site. The potential for ground rupture due to an earthquake is considered very low. However, the site is located in a seismic hazard zone for liquefaction potential. According to the Groundwater Memorandum, although the design high groundwater in the area is 5 feet deep based on historic levels in the area, the existing shallow groundwater at the Project Site is currently 10 to 15 feet deep based on borings, trenches and other data. Thus, groundwater is not expected to be encountered during excavation activities for the proposed buildings. Wet soil and some groundwater are generally anticipated only for the sewer connection excavation in the street. Based on the subsurface investigation performed as part of the Geotechnical Design Report, types of soils that underlie the site (clayey, silty, sandy alluvium) and the depth of groundwater, the risk for liquefaction at the July 2024 Page 47