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1 <br /> 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 i and 2 <br />' This Quarterly Monitoring Report summarizes the groundwater monitoring activities completed <br /> at the site on 19 September 2001 <br />' 2.0 SITE DESCRIPTION <br /> 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 /> t 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 /> 2.9 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 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 /> I <br /> millions of years The uppermost 1000 feet of sedimentary strata consist of Holocene, <br />�1 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 />�s <br /> 2.2 Hydrogeologic Conditions <br /> Groundwater is present beneath the site at a depth of 32 60, 32 50, 32 49 and 32 05 feet below <br /> top of casing (btc), as measured on 19 September 2001 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 19 58, 19 08, 19 95 and 19 70 <br /> feet below mean sea level respectively, based upon casing elevation data from Kier & Wright <br /> Civil Engineers and Surveyors <br /> wironeenng,Inc Project No 01-009 012 Page 2 <br />