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1 <br />' 20 March 2006 <br /> • AGE-NC Project No 95-0130 <br />' Page 2 of 13 <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 for 101 South Wilson <br /> Way (the site), Stockton, California The report documents fourth quarter 2005 procedures and <br /> results for a ground water monitonng event,progress of an interim remediation soil vapor extraction <br />' (SVE)recovery system and progress of an interim remediation ground water pump-and-treat(P&T) <br /> system The objectives of the site activities were to monitor dissolved petroleum hydrocarbon <br /> concentrations in ground water,to assess ground water flow direction and gradient, and to monitor <br />' the progress and effectiveness of SVE and P&T remediation at the site The site setting is illustrated <br /> on Figure 1 Site structures and monitoring well 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 (UST) sites A summary of previous investigations at the site was previously included in <br /> 0 Appendix A of Quarterly Report - First Quarter 2005, dated 02 June 2005 Ground water <br /> monitoring data acquired to date is included in the tables of this report <br /> Previous soil characteristics data obtained by a CPT Investigation enabled AGE to define four <br /> Informal hydrogeologlc units (Quarterly Report-Second Quarter 2000, dated 31 July 2000) The <br /> Informal hydrogeologlc units were defined as Hydrologic Unit 1 (HU1 - 40 to 55 feet bsg), <br /> Hydrologic Unit 2 (HU2 - 55 to 65 feet bsg), Hydrologic Unit 3 (HU3 - 65 to 85 feet bsg) and <br /> Hydrologic Unit 4 (HU4 - 85 to at least 100 feet bsg) <br /> The following is a brief summary of ground water monitoring, SVE and P&T remediation activities <br /> performed at the site during the fourth quarter 2005 <br />' • Between 07 September 2005 and 06 December 2005 -Continued P&T Interim ground water <br /> remediation utilizing on-site wells EW-1,EW-2,VW-1C,VW-2A and VW-3A, discharged <br />' approximately 174,065 gallons of treated ground water into the City of Stockton sanitary <br /> sewer system <br /> • Between 07 September and 07 December 2005 - Continued SVE Interim remediation <br />' utilizing SVE wells VW-1 (A-B), VW-2B and VW-3B, extracted a total of approximately <br /> 744 pounds of petroleum hydrocarbons from the subsurface <br />' - 10 October 2005 - Monthly monitoring event performed on P&T and SVE remediation <br /> . systems <br /> Advanced GcoEnvnronmental,Inc <br />