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2.4 Estimates of Liquid Quantity and Composition Leaked: <br /> No estimate of the quantity of liquid leaked can be made based on existing information The <br /> constituents detected in the soil samples show an analytical profile that is typical of gasoline <br /> 2.5 Regional Topography, Geology, Hydrology: <br /> The Site is situated on level terrain underlain by flood basin deposits of Pleistocene and <br /> Holocene age These sediments are composed of clay, silt, and some sand In the San Joaquin <br /> 1 Valley, the Flood Basin Deposits (Holocene) have been estimated to be as much as 100 feet thick <br /> (USGS 1986). Because of their fine-grained nature, the flood basin deposits in general do not <br /> yield much water to wells and impede the vertical movement of water The majority of <br /> groundwater used for irrigation and drinking water supplies is extracted from more permeable <br /> ' zones beneath the flood basin deposits Regional groundwater depth, based on other RESNA <br /> projects within one-half mile of the Site, is estimated to be approximately 12 to 15 feet below <br /> grade Groundwater flow beneath the Site is likely to be to the northeast, toward a pumping <br /> depression located east of Stockton (San Joaquin County Flood Control and Water Conservation <br /> District, Spring 1991), however, considerable variation in the groundwater gradient and flow <br /> direction exists in the Stockton area due to local influences <br /> Surface water bodies in the general vicinity of the subject Site include the Port of Stockton <br /> ' approximately 4800 feet to the north, and the San Joaquin River and Stockton Regional Waste j <br /> Water Ponds located approximately 2200 feet southwest of the Site <br /> 2.6 Well Location Survey: <br /> ' Well location data within a one-half mile radius of the Site have been reviewed at the <br /> Department of Water Resources (DWR) Central District office and are summarized in Table 1 <br /> The DWR data includes one domestic well, eight monitoring wells, one industrial well, one <br /> i <br /> municipal well, and one irrigation well In addition, nearby sites with known monitoring wells <br /> and/or groundwater remediation systems are located at 1444 Tillie Lewis Drive (6 monitoring <br /> wells), 2500 Navy Drive (4 monitoring wells), and 2324 Navy Drive (3 monitoring wells) <br /> A-61292 TL 2 <br />