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0 • <br /> Site Setting <br /> The investigation site is situated adjacent to the Stockton Deep Water <br /> Channel. The ground surface in the area of the tank lies <br /> approximately 10 feet above mean sea level <br />' Two water supply wells are located within 2,000 feet of the subject <br /> property (Figure 1-1). These wells are identified below <br /> Year <br /> Maja # Larztkm Drilled ILM <br /> 1 State of A Connell & I-5 1972 Irrigation <br /> 2 L Acosta 215 South L A St 1961 Domestic <br /> Gedlogy <br /> Soils observed during the excavation of the tank consist of semi- <br /> consolidated silt and silty clay These fine-grained sods represent <br /> deposits of the San Joaquin River Investigations of the 1515 West <br /> Weber site (located approximately 500 feet west of the 1325 West Weber <br /> site) indicated that the soils consisted of semi-consolidated silt and <br /> silty clay from the ground surface to a depth of approximately 10 feet. <br /> Below 10 feet and to the depth explored (30 feet), the soils consisted of <br /> unconsolidated sand. For the purpose of this work plan, ERM-West <br /> assumes that the two sites have a similar geologic and hydrologic <br /> setting <br /> Hydrology <br /> Ground water was observed within the bottom of the tank excavation <br /> (less than 10 feet from the ground surface) when the tank removal <br />' activities were performed Investigation and tank removal activities <br /> in this area (1515, 1541, and 1325 West Weber Avenue) indicate the <br /> occurrence of ground water at a few feet below the ground surface <br />' At 1515 West Weber, the ground water flow gradient is toward the <br /> south. Both gradient and flow direction are influenced by tidally <br /> induced water level fluctuations in the nearby Deep Water Channel. <br /> 1 <br /> 1-2 <br /> 1 <br />