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Quarterly Report - Third 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 and remediation performed at the site between 15 June 2004 and 15 September 2004 (third quarter) The site setting is illustrated on Figure 1 Site structures and monitoring well locations are depicted on Figure 2 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 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 granted permission to cease all ground water pump- and-treat operations and all monitoring associated with the pump-and-treat system Therefore, in accordance with the above RWQCB-approval letter, all ground water pump-and-treat operations were suspended at the site on 17 August 2004 The obi ectivcs the of third quarter investigations were to characterize, assess and monitor dissolved petroleum hydrocarbons and methyl tert-butyl ether (MTBE) concentrations in ground water, to characterize ground water flow direction and gradient and to monitor ground water pump-and-treat remediation progress at the site The following is a brief summary of third quarter site assessment and remediation activities Y Between 15 June and 17 August 2004 - Ground water pump-and-treat remediation was continued at the site utilizing extraction wells EW-4,EW-5,EW-7,EW-8 and EW-10,a total of approximately 885,468 gallons of treated Flag City Chevron ground water was discharged into a conveyance ditch located approximately 450 feet south of the site u 15 July 2004 - Monthly monitoring event at the ground water pump-and-treat remediation system e 17 August 2004 - Ground water pump-and-treat operations suspended at the site • 13 and 14 September 2004 - Quarterly ground water monitoring event (third quarter 2004) at wells MW-1 through MW-19 Advanced GeoEnwronmental,Inc