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4 Environmental Analysis <br /> 4.10 Hydrology/Water Quality <br /> topographic low point in the Central Valley where flow from the Sacramento River and San <br /> Joaquin River converge before draining into San Francisco Bay through the Suisun and San <br /> Pablo Bays. The nearest named streams, which also drain to the Delta, are Patterson Run to the <br /> north and Corral Hollow Creek to the south (see Figure 4.10-1). <br /> The local drainage area includes a main channel, a primary tributary, and a secondary tributary <br /> that combine to encompass the Project site (see Figure 4.10-2). The main channel watershed <br /> receives runoff from the Tesla Substation, a small part of the gen-tie line and some of the <br /> proposed facility, as well as flows from the channels conveying water from the primary and <br /> secondary tributaries. The primary tributary watershed includes most of the gen-tie line and some <br /> of the facility footprint. The secondary tributary receives runoff from the remainder of the facility <br /> footprint. There is a short section of the Pacific Gas and Electric (PG&E) gen-tie line that falls just <br /> outside of the local drainage area, with drainage to Patterson Run. <br /> The proposed facility is located on a topographic high point with drainage heading in three <br /> different directions. On the west side of the Project site, surface runoff heads west or northwest <br /> to the primary tributary watershed, which is an ephemeral channel that cuts across the northwest <br /> corner of the Project site. Most of the southern portion of the Project site drains to the much <br /> smaller secondary tributary watershed, from which the drainage course leaves the Project site in <br /> the southeast corner. Runoff from the remaining area of the Project site flows toward the north or <br /> northeast and ultimately reaches the main drainage, which is separate from the main channel of <br /> the larger watershed, downstream from (north of) the Project area (see Figure 4.10-2). <br /> Griffith Energy Storage Project 4.10-2 Tetra Tech/SCH 2022120675 <br /> Draft Environmental Impact Report August 2023 <br />