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4 Environmental Analysis 4.10 Hydrology/Water Quality Mitigation: None required. M PACT 4.10-5: Would the project conflict with or obstruct implementation of water quality control plan or sustainable groundwater management plan? (Less than Significant with Mitigation Incorporated) As discussed earlier, the Project would be regulated under the Basin Plan for the Sacramento River Basin and the San Joaquin River Basin (California RWQCB 2019). Neither the nature of the Project nor the type of development proposed would be likely to conflict with this plan or obstruct implementation of any of its provisions. In addition, by adhering to the conditions stipulated by the SWPPP and the NPDES permits for the Project, as required by Mitigation Measure GEO-1, water quality impacts would not result in violations to, conflicts with, or obstructions of the Basin Plan. There would be no impact related to this water quality control plan. Multiple GSAs cooperated in developing the Tracy Subbasin GSP (GEI Consultants 2021). Groundwater is not a significant water supply source in this subbasin, accounting for only approximately 3 percent of the general water supply., In addition, the expected construction and decommissioning water use of approximately 30.7 of per phase represents a trivial amount of the projected available groundwater surplus in the subbasin of 4,800 AFY. In addition, there are alternate sources of construction water available, with surplus water from the City of Tracy. Furthermore, Project water use will be essentially a temporary, one-time water use during construction and almost no water use while the facility is active. The expected water use for annual operations is negligible and would be continuous over an anticipated 35-year Project lifespan. Decommissioning water use is projected to be similar to construction. As a result, the Project would not conflict with or obstruct the existing GSP. Mitigation: GEO-1. 4.10.5 Mitigation Measures GEO-1: Stormwater Pollution and Prevention Plan. Please see Section 4.7, Geology, Soils, and Paleontological Resources, for this mitigation measure. HYDRO-1: Hydrology and Hydraulics Study.The Applicant shall engage a qualified practitioner or firm to prepare a comprehensive watershed hydrology evaluation as well as a targeted analysis of hydraulic conditions within specific portions of the drainage conveyances in the Project site drainage area. This evaluation and analysis will address both existing conditions and proposed (i.e., after development) conditions. The results shall provide data of sufficient detail and quality to allow preparation of a Project Site Drainage Plan that will be implemented during construction of the Project and provide extended controls for facility operations. The Site Drainage Plan will include detention ponds to provide adequate control of stormwater runoff and channel armoring to prevent erosion at detention pond outlets and new drainage channels. 4.10.6 Pacific Gas and Electric Tesla Substation To accommodate the Project, PG&E would be responsible for siting, design, and construction of the gen-tie line from the point of change of ownership (POCO) to its substation. Two options are available for the gen-tie line from this point. The first option would be to connect via an aboveground line from the POCO to a point on the west side of the southwestern boundary of the substation. The second option is to enter the substation on the southwestern edge by way of a Griffith Energy Storage Project 4.10-17 Tetra Tech/SCH 2022120675 Draft Environmental Impact Report August 2023