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2.2 Map Showing Site Location Relative to Nearby Landmarks: <br /> ' The site location is shown on Figure 1 <br /> ' 2.3 Proximity of Underground Utilities: <br /> Approximate locations of underground utilities in the vicinity of the former tank pit is exhibited <br /> ' in Figure 2 <br /> ' 2.4 Laboratory Results for Initial Soil Sampling: <br /> Initial soil sampling was performed on January 30, 1989 The analytical results are summarized <br /> ' in Table 1 Laboratory data sheets and chain-of-custody documentation are enclosed in <br /> Appendix I <br /> 2.5 Estimates of Liquid qu d 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 /> the Port of Stockton and 2 1 miles east of the San Joaquin River <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 interfingers 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 />' IPAR0492 TIL 2 <br />