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Quarterly Report - Fourth Quarter 2004 FLAG CITY CHEVRON 6421 Capitol Avenue, Lodi, California 1.0 INTRODUCTION AND SCOPE OF WORK At the request of Mr Richard Bokides,Advanced GeoEnvironmental, Inc (AGE)has prepared this quarterly report for 6421 Capitol Avenue (the site), Lodi, California The report documents procedures and results for ground water monitoring performed at the site between 27 and 28 December 2004 (fourth quarter) The site setting is illustrated on Figure 1 Site structures and monitoring well locations are depicted on Figure 2 The objectives the of fourth quarter investigation was to characterize, assess and monitor dissolved methyl tert-butyl ether (MTBE) concentrations in ground water and to characterize ground water flow direction and gradient The enclosed report was prepared as required by California Regional Water Quality Control Board- Central Valley Region (RWQCB) Cleanup and Abatement Order No 5-00-700, dated 01 March 2000, and was prepared in accordance with guidelines established by the RWQCB for investigation of underground storage tank (UST) sites Background information and a description of prior investigations at the site were included in AGE's Final Remediation Plan, dated 31 August 2000 Between November 2000 and 17 August 2004, a total volume of approximately 27,086,201 gallons of MTBE-impacted ground water was treated at the site utilizing ground water pump-and-treat technology and carbon filtration However,in the AGE-prepared Quarterly Report-Second Quarter 2004(dated 30 July 2004),AGE requested cessation of the Flag City Chevron ground water pump- and-treat system due to the lack of cost effectiveness for the clean-up of MTBE-impacted ground water In a letter dated 13 August 2004,the RWQCB concurred with AGE's request, and all ground water pump-and-treat operations were suspended at the site on 17 August 2004 2.0. GROUND WATER MONITORING AND SAMPLING On 27 and 28 December 2004,ground water monitoring and sampling were performed at 39 single- or multi-level ground water monitoring wells (MW-1 through MW-20), in addition, grab water samples were collected from two San Joaquin County service area No 31 municipal water wells (CSA-1 and CSA-2) on 30 December 2004 Quarterly ground water monitoring procedures for the site were outlined in the AGE-prepared Work Plan Addendum, dated 28 January 1998,and approved by the San Joaquin County Environmental Health Department(SJCEHD)by letter dated 24 February 1998 As-built monitoring well construction details are summarized in Table 1 A coordinated effort was made with Three B's Truck Plaza (14749 Thornton Road, Lodi CA) to conduct ground water monitoring activities concurrently, the Three B's Truck Plaza ground water elevation results and analytical results are in Appendix A Advanced Geo Environ mental,Inc