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4.8 – Water Draft Environmental Impact Report February 2021 14800 W. Schulte Road Logistics Center 4.8-1 4.8 Water This section describes the existing utility conditions of the 14800 Schulte Road Industrial Park Project (Project) site and vicinity, identifies associated regulatory requirements, evaluates potential impacts, and identifies mitigation measures related to the implementation of the Project. In addition to the documents incorporated by reference (see Section 2.7 of Chapter 2 of this Environmental Impact Report [EIR]), the following analysis is based, in part, on the following sources: • Draft Water Source Assessment for 14800 W. Schulte Road, Tracy, CA prepared by Schaaf & Wheeler Consulting Civil Engineers in December 2020 (Appendix G) 4.8.1 Existing Conditions Sacramento–San Joaquin Delta The Sacramento-San Joaquin Delta occupies the western portion of San Joaquin County and represents the point of discharge for the Sacramento and San Joaquin River systems. Water flows out of the Delta, into San Francisco Bay, and through the Golden Gate to the Pacific Ocean, creating an extensive estuary where salty ocean water and fresh river water commingle. In sum, water from over 40 percent of the state’s land area is discharged into the Delta (USGS, 1999). Regional Groundwater Similar to the surface water basins, the Central Valley is divided into different groundwater basins including the Sacramento Hydrologic Region (HR), the Tulare Lake HR, and the San Joaquin River HR. The San Joaquin HR covers approximately 9.7 million acres, representing the central portion of the Central Valley. This region is bound on the north by the Delta, the east by the Sierra Nevada, the west by the Diablo Range and the south by the Tehachapi Mountains. The HR includes two entire groundwater basins (Yosemite Valley and Los Banos Creek Valley) and part of the San Joaquin Valley basin which is made up of 9 subbasins. The Eastern San Joaquin Subbasin is the largest subbasin in the county. The subbasins are recharged in the upland areas of Eastern San Joaquin Count y and adjacent foothill areas to the east and west, and discharge to the low-lying area of the Delta and the San Joaquin River. In general, this HR is heavily reliant on groundwater supplies and accounts for approximately 18 percent of statewide groundwater use for both agricultural and urban needs (DWR 2003). The aquifers or water bearing zones within the San Joaquin River HR are generally very thick, accommodating wells as deep as 800 feet below the ground surface (DWR 2003). Aquifers include unconsolidated alluvium as well as consolidated rocks with unconfined and confined groundwater conditions. Since the beginning of agricultural development in the region, groundwater has been used in conjunction with surface water to meet water supply needs (DWR 2003). Historical groundwater use and over pumping in areas have resulted in significant land subsidence, especially in the southwest portion of the region. The County lies within the San Joaquin HR and overlies three of the subbasins within the San Joaquin Val ley groundwater basin: Eastern San Joaquin, Tracy, and Cosumnes. The Project site overlies the Tracy Subbasin.