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2.4 Laboratory Results for Initial Soil Sampling: <br /> Initial soil sampling was performed on January 34, 1989 The analytical results are summarized <br /> ' in Table 1 Laboratory reports and chain-of-custody documentation are enclosed in Appendix <br /> I <br /> ' 2.5 Estimates of Liquid Quantity and Composition Leaked: <br /> No estimate of liquid quantity can be made with existing information The constituents detected <br /> ' in the soil samples are typically derived from gasoline <br /> ' 2.6 Topography, Geology, Hydrology: <br /> The subject site is situated on gentle westward sloping terrain approximately 1 2 miles south of <br /> I <br /> the Port of Stockton and 2 1 miles east of the San Joaquin River j <br /> The geologic unit upon which the site is located is known as the Victor Formation. The Victor <br /> Formation occurs on the east side of San Joaquin County as a band approximately 15 miles wide <br /> and extending the length of the County The unit dips very gently to the west, with its upper <br /> surface lying approximately parallel to the present land surface The unit interf ngers and blends <br /> into the Flood Basin Deposit to the west with no apparent abruptness (DWR Bulletin No 146, <br /> 1967) The Victor Formation is usually difficult to differentiate from the underlying Laguna <br /> ' Formation as both are composed of similar lithologies derived from the Sierra granitics, <br /> metamorphics, and volcanics <br /> Because the Victor Formation is limited in thickness, most wells draw their water from the <br /> ' underlying Laguna Formation Depth to first groundwater is estimated to be approximately 45 <br /> feet below grade based on San Joaquin County's Flood Control and Water Conservation District, <br /> Spring 1991 data Regional groundwater flow is expected to be to the northeast toward a <br /> groundwater depression located east of Stockton <br /> 1 <br /> i <br /> I <br /> WP412892 TJL 2 <br />