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4 Environmental Analysis 4.18 Wildfire 4.18.3 Thresholds of Significance A project would result in significant wildfire impacts if located in or near state responsibility areas or lands classified as very high fire hazard severity zones, and would: a) Substantially impair an adopted emergency response plan or emergency evacuation plan; b) Due to slope, prevailing winds, and other factors, would exacerbate wildfire risks, and thereby expose project occupants to, pollutant concentrations from a wildfire or the uncontrolled spread of wildfire; c) Require the installation or maintenance of associated infrastructure (such as roads, fuel breaks, emergency water sources, power lines or other utilities) that may exacerbate fire risk or that may result in temporary or ongoing impacts to the environment; or d) Expose people or structures to significant risks, including downslope or downstream flooding or landslides, as a result of runoff,post-fire slope instability, or drainage changes? 4.18.4 Impact Analysis IMPACT 4.18-1: Would the project substantially impair an adopted emergency response plan or emergency evacuation plan? (No Impact) The Project is entirely located within a High FHSZ within the SRA and the nearest Very High FHSZ is located approximately 3.5 miles southwest of the Project site (Figure 4.18-1). The primary fire protection services in the vicinity of the Project site are provided by SJC Fire. However, CAL FIRE is responsible for providing wildland fire protection, fire prevention, and resource management within SRA lands throughout California. The ACFD would also provide fire services to the portion of the gen-tie corridor in Alameda County and the PG&E Tesla Substation. The Project would comply with all applicable CAL FIRE and San Joaquin County Fire Protection District requirements, including those regarding site access. The Project would also incorporate fire protection measures in accordance with the requirements set forth by the County through the Site Approval application process. As discussed in Sections 4.9, Hazards and Hazardous Materials, and 4.15, Transportation, the Project would not have an impact on emergency response, evacuation routes, and emergency access during construction, operation, and decommissioning. Due to the Project's location in a rural area of San Joaquin County and the gen-tie line's location in rural Alameda County, the Project site is not located near any established evacuation routes and would not require any road closures during any Project phase (San Joaquin County 2022d). Further, the Project would not result in population growth in the area, which could strain emergency evacuation efforts. Construction and decommissioning would also be temporary and short-term in nature, and construction of the Project would require approximately 60 workers at peak, with average number of workers on-site anticipated to be approximately 10 to 60 people. Decommissioning of the Project would require a similar workforce. During Project operation, one or two workers would visit the site on a weekly basis. Thus, due to the rural location of the Project and the minimal personnel required for all Project phases, the Project would result in no impact with regard to the substantial impairment of an adopted emergency response plan or emergency evacuation plan. Mitigation: None required. Griffith Energy Storage Project 4.18-13 Tetra Tech/SCH 2022120675 Draft Environmental Impact Report August 2023