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Executive Summary PROJECT DESCRIPTION The proposed project is designed to absorb or output approximately 400 MW of electricity within the BESS (on 32 acres in San Joaquin County) and would include a 230-kilovolt overhead or underground gen-tie line that will extend to the PG&E Tesla Substation within Alameda County. The gen-tie corridor is 14,920 feet long and 100 feet wide, such that the corridor incorporates approximately 8 acres. The Project would contain pad-mounted energy storage units, in addition to inverters, supervisory control and data acquisition (SCADA) equipment, a collector substation, and an interconnection gen-tie line to the Tesla Substation. The Project would also include related and supporting facilities, such as on-site service roads, gates and security fencing, and temporary laydown and construction areas. PROJECT IMPLEMENTATION SCHEDULE Construction is expected to begin in 2024 and be completed in approximately 15 months, including 3 months of testing and commissioning, with a workforce of 20 to 60 workers, depending on the phase. Once operational, the Project would operate 24 hours per day, 7 days a week, 365 days a year. Routine operations would require one or two workers in a light utility truck to visit the facility on a weekly basis. Typically, one major maintenance inspection would take place annually. The expected lifespan of the Project is 35 years. SUMMARY OF IMPACTS Table EX-1, Summary of Potential Impacts and Mitigation Measures, summarizes the potential impacts for the proposed Project. The table also identifies mitigation measures recommended to reduce, avoid, or minimize significant impacts and indicates the net level of impact following implementation of all mitigation measures. The potentially adverse effects of the proposed Project are discussed in Sections 4.1 through 4.18 of this Draft EIR. Mitigation measures have been recommended that would avoid, reduce, or minimize impacts. All of the potential impacts associated with the proposed Project would be either less than significant or mitigated to less than significant. The proposed Project would not result in any significant unavoidable impacts. PROJECT ALTERNATIVES Section 15126.6 of the CEQA Guidelines requires consideration and discussion of alternatives to the proposed Project, which would feasibly attain most of the basic objectives of the Project and would avoid or substantially lessen any of the significant effects of the proposed Project. In addition to the proposed Project, three project alternatives were considered and are briefly summarized here (and are discussed in detail in Chapter 5 of this Draft EIR). oo No Project Alternative: The Project site would not be developed and would remain in its existing condition and continue to experience a reduction in agricultural production from water resource allocation constraints. oo Three-Terrace Southeast Corner Alternative: The Project site would be set back from residences along West Patterson Pass to the north and Midway Road to the west. The Griffith Energy Storage Project ES-3 Tetra Tech/SCH 2022120675 Draft Environmental Impact Report August 2023