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r <br /> rs Reference— Quarterly Monitoring Report Dated 08/02/2001 Q2, 2001 <br /> • 'Reference— Quarterly Monitoring Report Dated 11/12/2001 Q3, 2001 <br /> rder t 10 Reference— Quarterly Monitoring Report Dated 02/05/2002 Q4, 2001 <br /> x <br /> 4 11 Reference— Quarterly Monitoring Report Dated 05/05/2002 Q1, 2002 <br /> I <br /> 9- <br /> 12 Reference— Quarterly Monitoring Report Dated 08/08/2002 Q2, 2002 <br /> 13 Reference— Quarterly Monitoring Report Dated 10/26/2002 Q3,2002 <br /> 14 Reference— Quarterly Monitoring Report Dated 04/09/03 Q 1, 2003 <br /> St <br /> 1s Reference— Quarterly Monitoring Report Dated 09/03/03 Q2, 2003 <br />' '(Reference— Quarterly Monitoring Report Dated 11/07/03 Q3, 2003 <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 activities completed <br /> at the site on 11/11/03 <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 /> 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 />' 3.0 Geologic Conditions <br /> The site is situated in the northern part of the San Joaquin Valley, in an area underlain by <br /> several thousand feet of terrestrial and marine sedimentary rocks The northern San Joaquin <br />' Valley has been a lowland area subject to marine intrusion, flooding and incremental <br /> sedimentation for millions of years The uppermost 1000 feet of sedimentary strata consist of <br /> Holocene, Pleistocene and Pliocene sediments, including the Laguna Formation, the Mehrten <br />' Formation and the Valley Spring Formation The sediments are interbedded mixed-fluvial and <br /> deltaic sediments, dominated by medium-grained sand and silts Generally, thin beds of <br /> unconsolidated clayey silt, silty clay and sandy clay are abundant in this upper zone, which are <br />' laterally discontinuous over distances of several tens of feet <br /> 1 o <br /> 4 <br /> I <br /> I <br />