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Quarterly Report - Fourth Quarter 2002 • Former Mel Bokides Petroleum Inc. - Navy Drive 2191 Navy Drive, Stockton, California I1.0. INTRODUCTION At the request of Mr Nick Bokides of Mel Bokides Petroleum Inc ,Advanced GeoEnvironmental, Inc (AGE) has prepared the enclosed report for the former Mel Bokides Petroleum fuel facility located at 2191 Navy Drive, Stockton, California(the site) The scope of work included conducting a quarterly ground water monitoring event and preparation of this report The site setting is Illustrated on Figure 1 Site structures, previous boring and monitoring well locations are depicted on Figure 2 The field work was performed and this report prepared in accordance with Central Valley Regional Water Quality Control Board(CVRWQCB)guidelines for subsurface Investigations of underground storage tank (UST) sites The site history and a description of previous work performed at the site were presented in the AGE-prepared Preliminary Investigation and Evaluation Report(PIER), dated 18 April 1999 and Quarterly Report- Third Quarter 2000, dated 09 October 2000 2.0. PROCEDURES On 02 October 2002, ground water monitoring and sampling were performed at the site on wells MW-1 and MW-3 through MW-8 Ground water monitoring well MW-2 was not readily located nor accessible during the sampling event Groundwater monitoring procedures for the site were outlined in Preliminary Site Assessment Work Plan, dated 15 June 1999 and conform to ground water monitoring guidelines issued by the San Joaquin County Environmental Health Department(EHD) 2 1 WELL MONITORING AND EVACUATION A Solinst water level meter was used to measure the depth to ground water in monitoring wells I MW 1 and MW-3 through MW-8 After depth to groundwater measurements were taken,a minimum of 3 casing-water volumes were purged from each well to be sampled using a new, disposable, dedicated bailer Approximately 9 gallons of water were removed from each well Temperature,pH and conductivity of purged ground water were measured at regular Intervals using an Oakton water analyzer Copies of the field data sheets are in Appendix A Purged water was temporarily stored on- site in DOT-approved 55-gallon drums pending proper disposal 22 COLLECTION AND ANALYSIS OF GROUND WATER SAMPLES After the depth to ground water was measured to ensure that a minimum of 80% well-volume recharge had been achieved, a water sample was collected from each well using a dedicated and Advanced Geo Environmental,Inc