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I <br /> 6 Reference Quarterly Monitoring Report Dated 01/29/2001 Q4, 2000 <br /> 7 Reference— Quarterly Monitoring Report Dated 06/18/2001 Q 1, 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 /> "'Reference— Quarterly Monitoring Report Dated 02/05/2002 Q4, 2001 <br />' 11 Reference— Quarterly Monitoring Report Dated 05/05/2002 Q1, 2002 <br /> I'Reference— Quarterly Monitoring Report Dated 08/08/2002 Q2, 2002 <br />' as Reference— Quarterly Monitoring Report Dated 10/26/2002 Q3, 2002 j <br /> CTL contracted EI to complete the required Quarterly Monitoring Report for the Site at 3105 <br /> i <br />' South El Dorado Street, Stockton The location is shown in Figures 1 and 2 <br /> I <br />' This Quarterly Monitoring Report summarizes the groundwater monitoring activities completed <br /> at the site on l February 2003 <br />' 20 SITE DESCRIPTION <br />' The subject site is located in the southern part of the City of Stockton, California (Figures l 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 facility, a small above-ground storage <br /> tank compound, a vehicle fueling facility and a large parking area for tank trailers <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 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 /> I <br /> Enrnroneenng,Inc Project No 03 002 18 Page 2 <br /> 1 <br />