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4 Environmental Analysis 4.17 Utilities and Service Systems Wastewater The Project site does not contain existing wastewater facilities or connections to wastewater conveyance systems-and no new connections to wastewater facilities or conveyance systems are proposed as part of the Project._Portable sanitary facilities would be provided for workers for the duration of Project construction and would be removed upon completion of construction. Therefore, the proposed Project would not require the relocation or construction of new wastewater facilities that would result in significant environmental impacts. Stormwater The battery energy storage facilities included in the proposed Project would include swales and armored outlets to direct stormwater in accordance with San Joaquin County, Alameda County, and State of California standards. No stormwater facilities would be required for the gen-tie line. The size and location of such features would be determined at a future date as site design progresses. Retention basins may be required for hydrologic control. The specific locations for these retention basins would be determined during final engineering design and would be located within the 32-acre disturbance area. During construction, coverage under the State's Construction General Permit would be required since the Project would disturb more than 1 acre. As part of the permit, a Project-specific SWPPP would be prepared and implemented, as required by Mitigation Measure GEO-1. Therefore, impacts from the construction of the stormwater facilities would be less than significant. Electric Power As a BESS facility, the Project would be a new component of the local electric power utility and service system, and the Project would interconnect with the nearby electricity grid at PG&E's Tesla Substation, which is located adjacent to the Project site using a new 230-kV gen-tie line. The Applicant would construct the gen-tie from the Project substation to the point south of the Tesla Substation. The gen-tie line would require new, steel tubular poles up to approximately 165 feet in height. The poles may be A-frame, H-frame, monopole, or a combination thereof, and the number and height of the poles would be finalized during detailed design. PG&E would be responsible for siting, design, and construction of the gen-tie line to its property boundary and within the Tesla Substation, and may elect to install the interconnection via an overhead line or underground. The Project includes multiple, modular, prefabricated battery enclosures in a parallel configuration. It is estimated that one inverter would be required for every four BESS enclosures. Underground or aboveground collector lines would transmit energy between an on- site switchyard and the inverters within the BESS switchyards. The proposed switchyard would host the grid intertie safety equipment and switches required to interconnect to the high-voltage transmission system. The switchyard would include switchgear and additional electrical equipment as required by PG&E specifications. As discussed above, the energy would be transported from the on-site substation to the adjacent PG&E Tesla Substation through a 230-kV overhead gen-tie transmission line. The gen-tie transmission line ROW is expected to be up to 100 feet wide and would include a maintenance road. Poles similar to those described above may also be required at substation terminus for the belowground gen-tie line, if required for interconnection. The Tesla Substation would provide the necessary circuit breakers, switches, protection relays, and other equipment to reliably and safely protect both the Project's and PG&E's electrical infrastructure. Griffith Energy Storage Project 4.17-9 Tetra Tech/SCH 2022120675 Draft Environmental Impact Report August 2023