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2.3 Site Plan: <br /> A site pla:' is presented on Figure 2. <br /> 2.4 Layout of all tanks and piping systems properly labeled for <br /> content: <br /> The former locations of the tanks, tank capacities, tank <br /> contents, and sampling locations are plotted on Figure 2- <br /> 2.5 Preliminary soil data: <br /> See Table 1 and Appendix 1. <br /> 2.6 Estimates of the volume of unauthorized release: <br /> Estimates of liquid quantity of fuel leaked cannot be <br /> determined from existing information_ Based on analytical <br /> results, the soil contamination appears to be derived from <br /> gasoline and diesel fuel. <br /> 2.7 Hydrogeological Setting: <br /> The site is situated in central Escalon in Section 4, T2S, <br /> R9E, San Joaquin County, California. Regionally the property <br /> is located in the San Joaquin Valley physiographic province. <br /> The valley is a topographic and structural basin bounded on <br /> the east by the Sierra Nevada and on the west by the Coast <br /> Ranges. Locally the topography slopes gently toward the west <br /> at approximately 5 feet per mile. The Stanislaus Rivar id 7'. <br /> :miles."'.-.to the soutj� 'and" .Woodward Reservo�r is'":located <br /> appro3iiinately 7 ' miles to the 'riortheas '(USGS Escalon <br /> Quadrangle, 1968). <br /> The near surface geology underlying the site is dominated by <br /> unconsolidated alluvial deposits of Pleistocene to Holocene <br /> age. These deposits, sometimes referred to as the "older <br /> alluvium", consist. o£ iiitercalated�beds of-'g3ravel;:.:sand;a;.silt <br /> and clay.,. The thickness of the older alluvium in the Escalon <br /> area averages approximately 450 feet. Underlying the older <br /> alluvium are Plio/Plei_stocene continental deposits of similar <br /> derivation and lithology. The older alluvium functions as the <br /> most important aquifer in the site area (USGS Professional <br /> Paper, 1401-C, 1486). <br /> Soils developed on the alluvium generally well drained <br /> --- ... ....__ dfferng...._from the parent material only in the increased - _..._. __ ---- <br /> volume of organic matter (DWR Bulletin No. <br /> 2 <br /> FPR0730.WP - <br /> y <br /> I��lmillill'in Jill Ill <br />