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4 Environmental Analysis 4.10 HydrologyiWater Quality belowground line as shown in Figure 2-1 of Chapter 2, Project Description. Either right-of-way corridor is assumed to be up to 100 feet in width. Additionally, PG&E would upgrade the Tesla Substation, and the improvements would include the installation of a grounding system, disconnect switches, surge arresters, outdoor lighting and outlets, and fiber termination for the gen-tie line. The improvements made would be within the existing Tesla Substation footprint. The construction activities associated with the PG&E infrastructure would be required to comply with and adhere to the same design criteria included in the CBC as the rest of the Project components. Construction would also need to comply with requirements of the Construction General Permit, similar to the Project components evaluated above, including implementation of BMPs during construction activities (Mitigation Measure GEO-1). Subsurface excavation required for the PG&E infrastructure is not anticipated to occur at depths below 10 feet below ground surface. These improvements would not affect any water quality standards or interfere with groundwater recharge, nor would the improvements increase the risk of pollutant discharge as a result of Project inundation. Additionally, the PG&E improvements would not obstruct the implementation of the Basin Plan or the Tracy Subbasin GSP. Thus, the improvement would have a less than significant impact with implementation of Mitigation Measure GEO-1. 4.10.7 Cumulative Impacts The geographic scope of analysis of cumulative effects includes the Project site, affected waterways, and surrounding watersheds and aquifers potentially impacted by site clearing, construction, O&M, and decommissioning of the Project. The cumulative development for water quality includes all development within the Basin Plan area (the Sacramento River Basin and the San Joaquin River Basin). The cumulative context for groundwater use is the Tracy Subbasin. This analysis considers the incremental effects of the Project to determine whether, when added to the effects of other projects in the cumulative scenario, they would cause or contribute to significant cumulative effects. There would be no impact with respect to being located in a flood hazard, tsunami, or seiche zone, such that the Project would not cause or contribute to any potential significant cumulative impact regarding these resource areas. The Project has the potential to contribute runoff and discharges that, in combination with other past, present, and future development in the Basin Plan watersheds, would potentially impact water quality. Likewise, these development activities would have the potential to infiltrate and affect groundwater quality in the basin, such that the Project could contribute to a potentially significant cumulative impact. However, the Project would be required to comply with the current (and any future) Basin Plan, applicable NPDES General Construction Permit requirements and ordinances, and other water quality regulations. These regulatory requirements and the design of the Project would reduce the Project's incremental contribution to the cumulative impact to a less than cumulatively considerable level. The Project, in combination with other past, present, and future development in the Basin Plan area would require the use of groundwater for construction and decommissioning activities. However, the following considerations would help to ameliorate any potential impacts from groundwater use. Griffith Energy Storage Project 4.10-18 Tetra Tech/SCH 2022120675 Draft Environmental Impact Report August 2023