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4 Environmental Analysis 4.17 Utilities and Service Systems 4.17 UTILITIES AND SERVICE SYSTEMS This section identifies and evaluates issues related to utilities and service systems in the context of the Griffith Energy Storage Project (Project). It includes the physical and regulatory setting, the criteria used to evaluate the significance of potential impacts, the methods used in evaluating these impacts, and the results of the impact assessment. San Joaquin County (County) received no scoping comments relating to utilities and service systems. This analysis is based in part on the Water Supply Assessment prepared by Tetra Tech in February 2023 (Appendix H). The County independently reviewed these analyses and other materials prepared by or on behalf of the Applicant, and determined them to be suitable for reliance, in combination with other materials included in the formal record, in the preparation of this Draft Environmental Impact Report (EIR). 4.17.1 Existing Conditions For the purposes of this analysis, the relevant utility or service systems are the water supply, wastewater, stormwater, solid waste disposal, gas and electrical, and telecommunication utilities that would provide service to the Project site. 4.17.1.1 Water Supply The Project is located in San Joaquin County, with generation tie (gen-tie)facilities and substation upgrades located in Alameda County, and is not included in a water agency boundary; the nearest water agency boundary is for the Byron Bethany Irrigation District, approximately 5 miles southeast of the Project. Four active domestic water wells are located on parcels owned by the current Project landowner (DWR 2006). Existing water supply infrastructure at the 106-acre Project site includes one on-site groundwater well and the other three wells on the landowner's property are outside of the Project site. No wells occur with the 32-acre area that would be developed as part of the Project. The Project site is located within the western portion of the Tracy Subbasin (#05-022.15), which is within the larger San Joaquin Valley Groundwater Basin (#05-022). This is a large subbasin (539 square miles), which spans parts of Alameda, Contra Costa, and San Joaquin Counties. The entire Project, including the gen-tie line, falls within the Tracy Subbasin. 4.17.1.2 Wastewater Wastewater service is not currently provided at the Project site. Within western San Joaquin County, rural areas generally use on-site septic systems for wastewater disposal. 4.17.1.3 Stormwater Existing stormwater drainage at the Project site is natural overland flow and infiltration into on- site soils. The site drainage is designed to follow the natural drainage pattern of the site. The southern portion of the Project area includes a steep slope where water drains away from the Project area naturally. No humanmade stormwater drainage facilities occur on the Project site. Griffith Energy Storage Project 4.17-1 Tetra Tech/SCH 2022120675 Draft Environmental Impact Report August 2023