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4 Environmental Analysis 4.7 Geology, Soils, and Paleontological Resources c) Be located on a geologic unit or soil that is unstable, or that would become unstable as a result of the project, and potentially result in on- or off-site landslide, lateral spreading, subsidence, liquefaction or collapse; d) Be located on expansive soil, as defined in Table 18-1-B of the Uniform Building Code (1994), creating substantial direct or indirect risks to life or property, e) Have soils incapable of adequately supporting the use of septic tanks or alternative wastewater disposal systems where sewers are not available for the disposal of wastewater; or f) Directly or indirectly destroy a unique paleontological resource or site or unique geologic feature? 4.7.4 Impacts Analysis IMPACT 4.7-1: Would the project directly or indirectly cause potential substantial adverse effects, including the risk of loss, injury, or death involving rupture of a known earthquake fault, as delineated on the most recent Alquist-Priolo Earthquake Fault Zoning Map issued by the state geologist for the area or based on other substantial evidence of a known fault, strong seismic ground shaking; seismic-related ground failure, including liquefaction; or landslides? (Less than Significant Impact) The Project site and gen-tie corridor do not lie within any mapped earthquake fault zones according to available data. Although the area could be affected by earthquakes or seismic ground shaking, no current data indicate that active (Historic)faults are present within the Project site or gen-tie corridor. The closest earthquake fault is the Midway fault , which bisects the Project site from the northwest to the southeast. However, it is classified as a Late Quaternary fault, with last activity more than 11,700 years ago and less than 700,000 years ago. In addition, the Black Butte fault and the Carnegie-Corral fault zone are located 3 to 4 miles southwest of the Project site. None of these faults/fault zones show signs of recent (Holocene) activity. The Greenville and Las Positas fault zones are the closest active tectonic areas identified as Alquist-Priolo Fault Zones, but they are more than 7 miles west of the Project site. Further, the Project will not include habitable structures and will only have personnel on-site periodically. Therefore, the facility will not potentially expose people or structures to substantial adverse effects associated with rupture of a known earthquake fault. There would be no impact related to surface fault rupture during the construction, operations, or decommissioning periods of the Project. Because the Project facilities potentially could be subject to moderate to severe seismic ground shaking due to the proximity to these fault zones, damage could occur and injuries are possible if personnel happen to be on-site at the time of a significant earthquake. Should strong seismic ground shaking occur at or near the Project site, the on-site facilities could be damaged. However, the Project will be subject to the seismic design criteria of the CBC, which requires that all improvements be constructed to withstand any anticipated ground shaking from regional fault sources and require that the Project owner retain a licensed geotechnical engineer to design the Project components to withstand probable, seismically induced ground shaking. All construction Griffith Energy Storage Project 4.7-15 Tetra Tech/SCH 2022120675 Draft Environmental Impact Report August 2023