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1 <br /> Report of Investigation <br /> Former Underground Storage Tanks <br /> 3105 South E1 Dorado Street Stockton California <br /> Sierra-Pawfc Project No 96 620 01 <br />' 2.0 SITE DESCRIPTION <br /> The subject site is located in the southern part of the City of Stockton, California The site is an <br /> essentially level commercial trucking facility, which contains an office building, two truck-maintenance <br /> shops, a truck-washing rack, a small above-ground storage tank compound, a vehicle fueling facility, <br /> and a large parking area for tank trailers (see Figure 3) <br /> 2.1 Geologic Conditions <br />' The site is situated in the northern part of the San Joaquin Valley, in an area underlain by several <br /> thousand feet of terrestnal and marine sedimentary rocks The northern San Joaquin Valley has been <br /> a lowland area subject to marine intrusion, flooding, and incremental sedimentation for millions of years <br /> The uppermost 1,000 feet of sedimentary strata consist of Holocene, Pleistocene, and Pliocene <br /> sediments, including the Laguna Formation, the Mehrten Formation, and the Valley Springs Formation <br /> The sediments are interbedded mixed-fluvial and deltaic sediments, dominated by medium-grained sand <br />' and silts Generally thin beds of unconsolidated clayey silt, silty clay, and sandy clay are abundant in <br />' this upper zone, which are laterally discontinuous over distances of several tens of feet <br /> ' 2.2 H dro eolo is Conditions <br /> Ground water is present beneath the site at a depth of approximately 33 feet below ground surface (bgs), <br /> ' as measured in a ground-water monitoring well recently installed at the site (Figure 4) The elevation <br /> of ground water was calculated by Sierra-Pacific at 18 feet below mean sea level, based upon elevation <br /> data from the U S Geological Survey Stockton West 7 5-minute quadrangle map The northeasterly <br /> ground-water flow direction shown herein is based upon several published data sets, notably the Eastern <br /> San Joaquin County Groundwater Study prepared by Brown and Caldwell Consulting Engineers in 1985 <br /> (see References, Section 6 0) This shallow aquifer is part of the Eastern San Joaquin County Ground- <br /> water Basin, as defined in the California Department of Water Resources Bulletin 118-80, published in <br /> Sterra-Pactjic Groundwater Consultants, Inc 2 <br />