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' Quarterly Report - Third Quarter 2005 <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 third quarter 2005 procedures and results <br /> for a ground water monitoring event,progress of an interim remediation soil vapor extraction(SVE) <br /> recovery system and progress of an interim remediation ground water pump-and-treat(P&T)system <br />' The objectives ofthe site activities were to monitor dissolved petroleum hydrocarbon concentrations <br /> in ground water,to assess ground water flow direction and gradient,and to monitor the progress and <br />' effectiveness of SVE and P&T remediation at the site The site setting is illustrated on Figure 1 Site <br /> 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 />' 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 hydrogeologic units (Quarterly Report-Second Quarter 2000, dated 31 July 2000) The <br /> informal hydrogeologic 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 third quarter 2005 <br />' • Between 03 June 2005 and 07 September 2005 - Continued P&T interim ground water <br /> remediation utilizing on-site wells EW-1,EW-2,VW-IC,VW-2A and VW-3A, discharged <br /> approximately 255,480 gallons of treated ground water into the City of Stockton sanitary <br /> rsewer system <br /> • Between 22 June and 07 September 2005 - Continued SVE interim remediation utilizing <br />' SVE wells VW-1 (A-B), VW-2B and VW-313, extracted a total of approximately 1,570 <br /> pounds of petroleum hydrocarbons from the subsurface <br />' • 15 July 2005 -Monthly monitoring event performed on P&T and SVE remediation systems <br /> • 01 August 2005 Monthly monitoring event performed on P&T and SVE remediation <br /> system <br /> f - 17 August 2005 - Submersible, fluid pneumatic extraction pumps were installed in wells <br /> VW-1C, VW-2A and VW-3A, continuous ground water extraction activities initiated at <br /> rAdvanced GcoEnvzronmental,Inc <br /> I <br />