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Executive Summary Level of Potential Impacts Significance Mitigation Measures treatment and respectful behavior of a discovery(e.g., no posting to social media or photographs). CUL-2: Inadvertent Discovery of Archaeological Resources During Construction A qualified archaeologist pre-approved by San Joaquin County shall prepare an Inadvertent Discovery Plan for the Project. The Inadvertent Discovery Plan will provide protocols and notification procedures in the event of an inadvertent discovery. During Project construction (e.g., ground disturbing activities, such as vegetation removal, excavation,trenching, grading), should subsurface archaeological resources be discovered, all ground disturbing activities within 50 feet of the find shall cease and the qualified archaeologist shall be contacted to assess the significance of the find according to CEQA Guidelines Section 15064.5. If any find is determined to be significant, the archaeologist shall determine, in consultation with the implementing agencies and any local consulting Native American groups expressing interest, appropriate avoidance measures or other appropriate mitigation. Under CEQA Guidelines Section 15126.4(b)(3), preservation in place shall be the preferred means to avoid impacts to archaeological resources qualifying as historical resources. Methods of avoidance may include, but shall not be limited to, Project reroute or redesign, or identification of protection measures, such as capping or fencing. Consistent with CEQA Guidelines Section 15126.4(b)(3)(C), if it is demonstrated that resources cannot be avoided,the qualified archaeologist shall develop additional treatment measures, such as data recovery or other appropriate measures, in consultation with the implementing agency and any local consulting Native American representatives expressing interest in prehistoric or tribal resources. If an archaeological site does not qualify as a historical resource but meets the criteria for a unique archaeological resource as defined in Section 21083.2, then the site shall be treated in accordance with the provisions of Section 21083.2. If inadvertent discoveries are identified, all findings and treatments shall be documented in a cultural resources report that is submitted to San Joaquin County. IMPACT 4.5-3:Would the project disturb any human remains, Less than No mitigation required. including those interred outside of formal cemeteries? Significant Impact Griffith Energy Storage Project ES-23 Tetra Tech/SCH2O22120675 Draft Environmental Impact Report August 2023