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California Tank Lines, Inc contracted Environeering, Inc (EI) to complete the required Report <br /> of Investigation for the Site at 3105 South El Dorado Street, Stockton A Work Plan dated 1 <br /> May 2000 and a Work Plan Addendum dated 11 May 2000 were prepared by EI to describe the <br /> proposed scope of this investigation This work plan and work plan addendum were reviewed <br /> and approved by the County This report represents the findings of that investigation <br /> r <br /> 20 SITE DESCRIPTION <br /> The subject site is located in the southern part of the City of Stockton, California (Figures 1 and <br /> r <br />. 2) The site is an essentially level commercial trucking facility, which contains an office <br /> building, two truck maintenance shops, a wash rack with wastewater pretreatment, a small <br /> above-ground storage tank compound, a vehicle fueling facility and a large parking area for tank <br /> r trailers <br /> r 2.1 Geoiogic Conditions <br /> r <br /> r The site is situated in the northern part of the San Joaquin Valley, in an area underlain by several <br /> thousand feet of terrestrial and marine sedimentary rocks The northern San Joaquin Valley has <br /> been a lowland area subject to marine intrusion, flooding and incremental sedimentation for <br /> millions of years The uppermost 1000 feet of sedimentary strata consist of Holocene, <br /> Pleistocene and Pliocene sediments, including the Laguna Formation, the Mehrten Formation <br /> and the Valley Spring Formation The sediments are interbedded mixed-fluvtal and deltaic <br /> r <br />. sediments, dominated by medium-grained sand and silts Generally, thin beds of unconsolidated <br /> r clayey silt, silty clay and sandy clay are abundant in this upper zone, which are laterally <br /> discontinuous over distances of several tens of feet <br /> r <br /> 2.2 Hydrogeoiogic Conditions <br /> r <br /> Groundwater is present beneath the site at a depth of 29 21, 28 60, 29 10 and 28 65 feet below <br /> top of casing (btc), as measured on 21 November 2000 in the four groundwater monitoring wells <br /> (MW-1, MW-2, MW-3 and MW-4 respectively) installed on site The elevation of groundwater <br /> 1 in MW-1, MW-2, MW-3 and MW-4 was calculated by EI to be at 16 19, 15 18, 16 26 and 16 30 <br /> feet below sea level respectively, based upon casing elevation data from Kier & Wright Civil <br /> Engineers and Surveyors <br /> rEnvironeenng,Inc Project No 00-01108 2 <br /> r <br /> r <br /> r <br />