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Quarterly Report - Third Quarter 2004 <br /> TOP FILLING STATION <br />' 101 South Wilson Way, Stockton, California <br />' 1.0. INTRODUCTION AND SCOPE OF WORK <br /> Advanced GeoEnvironmental, Inc (AGE) has prepared this quarterly report documenting the <br />' procedures and results for third quarter 2004 ground water monitoring event performed at 101 South <br /> Wilson Way (the site), Stockton, California, the report also documents start-up procedures for an <br /> interim soil vapor extraction recovery system on 31 August 2004 The objectives of the site activities <br /> Iwere to monitor dissolved petroleum hydrocarbon concentrations in ground water,to assess ground <br /> water flow direction and gradient, and to monitor the progress and effectiveness of SVE interim <br /> remediation at the site The site setting is illustrated on Figure 1 Site structures and monitoring well <br />' locations are depicted on Figure 2 <br />' This report has been prepared in accordance with guidelines issued by the California Regional Water <br /> Quality Control Board(RWQCB)-Central Valley Region for investigation of underground storage <br /> tank(CYST)sites A summary ofprevious investigations at the site was included in the AGE-prepared <br />' Quarterly Report- Third Quarter 2002, dated 13 December 2002 Ground water monitoring data <br /> acquired to date is included in the tables of this report <br /> lie <br /> Previous soil characteristics data obtained by a CPT investigation enabled AGE to define four <br /> informal hydrogeologic units (Quarterly Report - Second Quarter 2000, dated 31 July 2000) The <br /> informal hydrogeologic units were defined as Hydrologic Unit 1 (30 to 55 feet bsg), Hydrologic <br /> Unit 2(55 to 65 feet bsg),Hydrologic Unit 3 (65 to 85 feet bsg)and Hydrologic Unit 4(85 to at least <br /> 100 feet bsg) <br />' The following is a brief summary of ground water monitoring and SVE interim remediation activities <br /> performed at the site during the third quarter 2004 <br />' • Between 31 August 2004 and 01 October 2004 - Initiated on-site SVE interim remediation <br /> utilizing on-site SVE wells VW-1A/B, VW-2A and VW-3A, extracted a total of <br /> approximately 3,578 pounds of total petroleum hydrocarbons from the subsurface <br /> 1 • 22 September 2004 - Monthly monitoring event performed on SVE remediation system <br /> • 30 September 2004 - Quarterly ground water monitoring event (Third Quarter 2004) <br /> performed at wells MW-1 through MW-8, VW-1C, VW-2A and VW-3A <br /> 01 October 2004 - Monthly monitoring event performed on SVE remediation system <br />' Advanced GeoEnvironmental,Inc <br /> 1 <br />