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1 <br /> Reference— Quarterly Monitoring Report Dated 06/18/2001 Q1, 2001 <br />' 8 Reference— Quarterly Monitoring Report Dated 08/02/2001 Q2, 2001 <br /> 9 Reference— Quarterly Monitoring Report Dated 11/12/2001. Q3, 2001 <br />' 10 Reference— Quarterly Momtonng Report Dated 02/05/2002 Q4, 2001 <br /> 11 Reference--- Quarterly Monitoring Report Dated 05/05/2002 Q1, 2002 <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 1 and 2 <br />' This Quarterly Monitoring Report summarizes the groundwater monitoring ng activities completed <br />' at the site on 25 June 2002 <br /> 20 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 /> building, two truck maintenance shops, a truck-washing facility, a small above-ground storage <br />' tank compound, a vehicle fueling facility and a large parking area for tank trailers <br /> lie2.9 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 /> Imillions 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 /> 2.2 Hydrogeologic Conditions <br /> IGroundwater is present beneath the site at a depth of 30 10, 31 00, 29 96 and 29 57 feet below <br /> top of casing (btc), as measured on 25 June 2002 in the four groundwater monitoring wells <br /> i <br /> I <br /> Environeenng,Inc Project No 02 007 96 Page 2 <br /> I <br />