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I <br />' Quarterly Report - Fourth 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 GeoEnvironniental, Inc (AGE) has prepared this <br /> fquarterly report documenting the procedures and results for the fourth quarter 2004 ground water <br /> monitoring event performed at 2402 Pacific Avenue, Stockton, California(the site), the report also <br />' documents the September through December 2004 progress of the in-situ air sparging(IAS)and soil <br /> vapor extraction (SVE) recovery system The objectives of the site activities were to monitor <br /> dissolved petroleum hydrocarbon concentrations in ground water, to assess ground water flow <br />' direction and gradient, and to monitor the progress and effectiveness of SVE and IAS remediation <br /> at the site The site setting is illustrated on Figure 1 Structures and monitoring well locations are <br /> depicted on Figure 2 <br /> This report has been prepared in accordance with guidelines issued by the Central Valley Regional <br /> Water Quality Control Board(CVRWQCB)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 /> IThe following is a brief summary of site assessment and SVE remediation activities performed at <br /> the site between 23 September and 22 December 2004 (fourth quarter 2004) <br /> • Between 23 September and 22 December 2004 - Continued SVEJAS remediation utilizing <br /> on-site SVE wells (VW-1, VW-2, VW-5) and IAS well AW-1B, extracted a total of <br /> approximately 491 pounds (79 gallons) of petroleum hydrocarbons from the subsurface <br /> • 25 October 2004 - Monthly monitoring event performed on SVE/fAS remediation system <br /> • 22 November 2004-Monthly monitoring event performed on SVE/IAS remediation system <br /> • 30 November 2004 - Quarterly ground water monitoring event (fourth quarter 2004) <br /> performed on wells MW-1 through MW-13, AW-1, and AW-2 <br /> • 22 December 2004-Monthly monitoring event performed on SVEJAS remediation system <br /> 2.0. GROUND WATER MONITORING/SAMPLING PROCEDURES AND RESULTS <br /> On 30 November 2004 round water monitoring was performed at the site on single-level wells <br /> � g g p g <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 GeoEnvironanental,Inc <br /> I <br />