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Traffic Impact Study Griffith Energy Storage Project 2.0 PROJECT DESCRIPTION On behalf of the Applicant, Tetra Tech Inc. has prepared this Traffic Impact Study to assess the potential transportation impacts of the proposed construction and operation of the Project. The Project consists of constructing and operating a 400-MW Energy Storage Project to provide reliable and flexible power to the local electrical system. The Project would contain pad-mounted energy storage units, in addition to inverters, supervisory control and data acquisition equipment, a collector substation, and an interconnection gen-tie line to the Tesla Substation. The Tesla Substation is adjacent to the Project to the west, in Alameda County. 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. Each enclosure would be equipped with heating, ventilation, and air conditioning systems for thermal management of the batteries. The power for the heating, ventilation, and air 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. 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. 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. 2.1 PROJECT LOCATION The Project site is located along the western edge of San Joaquin County. The Project sits 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. NTETRA TECH 2 February 2023