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• Quarterly Report - Second 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 16 March 2004 and 15 June 2004 (second 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 The objectives the of second 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 continue ground water pump-and-treat remediation at the site The following is a brief summary of second quarter site assessment and remediation activities Between 16 March and 22 April 2004 - The pump-and-treat remediation system was operational,utilizing extraction wells EW-4,EW-5,EW-8 and EW-10 to treat approximately 674,029 gallons of Flag City Chevron MTBE-impacted ground water,however,between 22 April and 28 Apnl 2004, the pump-and-treat remediation system was non-operational due to a mechanical malfunction with the process pump A new process pump was installed on 28 April 2004 and the pump-and-treat system restarted 28 April 2004 - Due to elevated MTBE concentrations detected at EW-7 during the first quarter 2004 ground water monitoring event(17 March 2004),the submersible pump utilized at extraction well EW-9 was removed and reinstalled in well EW-7 After transferring the submersible pump from EW-9 to EW-7, extraction well EW-7 was restarted and brought back on-line with extraction wells EW-4, EW-5, EW-8 and EW-10 Currently, extraction wells EW-6 and EW-9 are off-line and do not have submersible pumps Between 28 April and 15 rune 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 53 8,2 63 gallons of treated Flag City Chevron ground water was discharged into a conveyance ditch located approximately 450 feet south of the site 14 April, 13 May and 15 June 2004-Monthly monitoring events at the ground water pump- and-treat remediation system Advanced GeoEnvironmental,Inc