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I <br /> s Reference- Quarterly Monitoring Report Dated 08/02/2001 Q2, 2001 <br /> iReference- Quarterly Monitoring Report Dated 11/12/2001 Q3, 2001 � <br /> I i <br /> i 10 Reference- Quarterly Monitoring Report Dated 02/05/2002 Q4, 2001 <br /> "Reference- Quarterly Monitoring Report Dated 05/05/2002 Ql, 2002 <br /> � 12 Reference- Quarterly Monitoring Report Dated 08/08/2002 Q2, 2002 <br /> 1 i <br /> Reference- Quarterly Monitoring Report Dated 10/26/2002 Q3, 2002 i <br /> i <br /> 14 Reference- Quarterly Monitoring Report Dated 04/09/03 Q19 2003 <br /> Reference- Quarterly Monitoring Report Dated 09/03/03 Q2, 2003 <br /> 7 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 l and 2 <br /> LIThis Quarterly Monitoring Report summarizes the groundwater monitoring activities completed <br /> at the site on 09/30/03 <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 /> I3 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 k <br /> laterally discontinuous over distances of several tens of feet <br /> 4 0 Hydrogeologic Conditions <br /> Groundwater is present beneath the site at a depth of 34 89, 35 30, 34 79 and 34 40 feet below <br /> 1 top of casing(bte), as measured on 09/30/03 in the four groundwater monitoring wells(MW-1, <br /> MW-2, MW-3 and MW-4 respectively) installed on site The elevation of groundwater in MW- i <br /> 1 MW-2, MW-3 and MW-4 was calculated by El to be at 2187, 21 88, 21 95 and 22 05 feet <br /> 1 below mean sea level respectively, based upon casing elevation data from Kier & Wright Civil <br /> Engineers and Surveyors <br /> 1 4 _ <br /> 1 <br />