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1 <br /> r CTL contracted EI to complete the required Quarterly Monitoring Report for the Site at 3105 <br /> South El Dorado Street, Stockton The location is shown in Figures 1 and 2 <br /> Y <br /> This Quarterly Monitoring Report summarizes the groundwater monitoring activities completed <br />• at the site on 21 November 2000 <br /> 2.0 SITE DESCRIPTION <br /> i <br /> i The subject site is located in the Southern part of the City of Stockton, California (Figures 1 and <br /> 2) The site is an essentially level commercial trucking facility, which contains an office <br /> i building, two truck maintenance shops, a truck-washing rack, a small above-ground storage tank <br /> compound, a vehicle fueling facility and a large parking area for tank trailers <br /> i 2.1 Geologic Conditions <br /> i The site is situated in the northern part of the San Joaquin Valley, in an area underlain by several <br /> i 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-fluvial and deltaic <br /> sediments, dominated by medium-grained sand and silts Generally, thin beds of unconsolidated <br /> 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 2.2 Hydrogeologic Conditions <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 /> 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 /> EI utilized the groundwater measurements to determine the direction of groundwater flow and <br />. Environeenng,Inc Project No 01-00109 Page 2 <br /> r <br />