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1 Quarterly Report - Third Quarter 2004 <br /> CALIFORNIA FUELS CARDLOCK STATION <br />' 2402 Pacific Avenue, Stockton, California <br />' 1.0. INTRODUCTION <br /> At the request of Mr David Atwater, Advanced GeoEnvironmental, Inc (AGE) has prepared this <br />' quarterly report documenting the procedures and results for the third quarter 2004 ground water <br /> monitonng event performed at 2402 Pacific Avenue, Stockton, California(the site),the report also <br /> documents the June through September 2004 progress of the in-situ air sparging(IAS)and soil vapor <br /> extraction (SVE) recovery system The objectives of the site activities were to monitor dissolved <br /> petroleum hydrocarbon concentrations in ground water, to assess ground water flow direction and <br /> gradient, and to monitor the progress and effectiveness of SVE and 1AS remediation at the site The <br /> site setting is illustrated on Figure 1 Structures and monitoring well locations are depicted on <br /> Figure 2 <br />' This report has been prepared in accordance with guidelines issued by the Central Valley Regional <br /> Water Quality Control Board(C VRWQCB)for the investigation of underground storage tank(UST) <br /> sites A summary of previous investigations at the site was included in Appendix A of Quarterly <br /> Report-Second Quarter 2004, dated 01 October 2004 Analytical data acquired to date is included <br /> in the tables in this report <br /> • The following is a brief summary of site assessment and SVE remediation activities performed at <br /> the site between 22 June and 07 October 2004 (third quarter 2004) <br /> • Between 22 June and 23 September 2004-Continued SVE/IAS remediation utilizing on-site <br /> SVE wells (VW-1 through VW-5) and IAS well AW-1B and AW-2B, extracted a total of <br />' approximately 475 pounds (76 gallons) of petroleum hydrocarbons from the subsurface <br /> • 22 July 2004 - Monthly monitoring event performed on SVE/IAS remediation system <br />' • 25 August 2004 - Monthly monitoring event performed on SVE/IAS remediation system <br /> • 23 September 2004-Monthly monitoring event performed on SVE/IAS remediation system <br />' • 06 and 07 October 2004 - Quarterly ground water monitoring event (third quarter 2004) <br /> performed on wells MW-1 through MW-13, AW-1, and AW-2 <br /> 2.0. GROUND WATER MONITORING/SAMPLING PROCEDURES AND RESULTS <br /> On 06 and 07 October 2004,ground water monitoring was performed at the site on single-level wells <br /> MW-1 through MW-12, multi-level well MW-13 (A, B, and C), and air sparge wells AW-1 (A <br /> and B)and AW-2(A and B) Ground water monitoring procedures for the site were outlined in Work <br /> Plan Addendum, dated 16 May 2000, and conform to ground water monitoring guidelines issued by <br /> Advanced GeoEnvi ron mental,Inc <br />