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C I • Quarterly Report - Fourth Quarter 2002 i { FLAG CITY CHEVRON 6421 Capitol Avenue, Lodi, California - I1.0. INTRODUCTION AND SCOPE OF WORK 3 At the request of Mr Richard Bokides,Advanced GeoEnvironmental, Inc (AGE) has prepared this ti ' 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 September and December 2002 (fourth quarter) The site setting is illustrated on Figure 1 Site } structures and monitoring well locations are depicted on Figure 2 I 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 iri accordance with guidelines established by the RWQCB for investigation I 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 I; The objectives the of fourth 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 fourth quarter site assessment and remediation activitiesP erformed at the site IBetween 05 September and 25 September 2002 - Continued"pump-and-treat"remediation utilizing on-site extraction wells EW-4,EW-5,EW-8,EW-9 and EW-10,discharged treated Flag City Chevron ground water into a conveyance ditch located approximately 450 feet south of the site - • Between 25 September and 29 October 2002 - Ground water pump-and-treat system Ioperations were temporanly suspended due to a detection of hexavalent chromium' at the pump-and-treat effluent at a concentration of 0 30 micrograms per liter(µg/1),a confirmation sample of the pump-and treat effluent was collected thereafter and was reported by the laboratory as not detected less than 0 5 micrograms per liter(µg/1) Y , On 29 October 2002-Ground water pump-and-treat operations restarted utilizing extraction wells EW-4, EW-5, EW-8 and EW-10 • On 13 November 2002 - Completion of repairs to the submersible pump at extraction well ' EW-9, ground water extraction at well EW-9 was substituted for ground water extraction at well EW-8 I ' I , n I • On 21 November 2002 -AGE performed a monthly monitoring event at the ground water pump-and-treat remediation system • On 05 December 2002 '- AGE performed a monthly monitoring event at the ground water ` I Advanced GeoEnvironmental,Inc