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Air Quality and Greenhouse Gas Technical Report Griffith Energy Storage Project conditioning system would be provided through a connection to the on-site station service transformer with connection lines installed above and/or below ground. The Project would support the state policies necessary to meet the California renewable energy standards. California has proceeded to advance energy storage uses to support the grid, including the passage of AB 2514, as well as the resulting California Public Utilities Commission decision for energy procurement targets for each of the investor-owned utilities. The proposed Project would substantially increase local energy storage capacity and address the limitations of the electrical grid by the increasing demand for renewable energy. Layering energy storage systems into the energy grid improves grid reliability and makes it more resilient to disturbances and peaks in energy demand. The Project and other energy storage systems are used to supply power during brief disturbances, reduce outages and associated impacts to the community, and substitute for certain large footprint transmission and disruption upgrades. The proposed battery energy storage system would deliver power to the Tesla Substation located adjacent to the Project Site in Alameda County through a new 230 kilovolt gen-tie line. The Applicant would construct the gen-tie from the Project substation to the point south of the Tesla Substation shown on Figure 1. PG&E would be responsible for siting, design, and construction of the gen-tie line to their property boundary and within the Tesla Substation. As shown on Figure 1, PG&E may elect to install the interconnection via an overhead line or underground from the Point of Change of Ownership to the substation. Access, including emergency access, onto the Project site would be provided from Patterson Pass Road to Midway Road to an access road that would lead to the Project site. Internal access roads would be gravel or aggregate base depending on the final site geotechnical report. The perimeter of the Project site would be enclosed by a 6-foot-tall chain-link fence topped with 1 foot of 3-strand barbed wire. The purpose of the fence would be to prevent unauthorized access to the site. In addition, an approximately 8-foot-high perimeter security fence topped with approximately 1 foot of barbed wire would be installed around the on-site substation. Once constructed, the Project would operate 7 days per week, 365 days per year. The facility would be operated by the Applicant or an affiliated company remotely. Periodic augmentation of batteries within the Project site may occur. Only occasional, on-site maintenance is expected to be required following commissioning, including replacement of inverter power modules, filters, and miscellaneous electrical repairs on an as-needed basis. No permanent sanitary facilities would be required. During operation of the Project substation, operation and maintenance staff would visit the substation periodically for switching and other operation activities. Routine operations would require one or two workers in a light utility truck to visit the facility on a weekly basis. Maintenance trucks would be utilized to perform routine maintenance, including but not limited to equipment testing, monitoring, repair, routine procedures to ensure service continuity, and standard preventative maintenance. Typically, one major maintenance inspection would take place annually. 1.3 REGIONAL AND LOCAL SETTING The Property is approximately 0.9 mile southwest of Interstate 580 and approximately 5 miles southwest of the city of Tracy, adjacent to PG&E Tesla Substation, as shown on Figure 1. The Project site is private land zoned as Agricultural General-160 and designated as General Agriculture. Division 14, Section 9-115.580 of the San Joaquin County Municipal Ordinance Code allows any major utilities on Agricultural General zoned land through a Site Approval application (San Joaquin County 2021). Land uses on the Project site consist of private land used for grazing and includes two rural residences. OTETRA TECH 4 July 2023