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1• Quarterly Report - Fourth Quarter 2001 Former Mel Bokides Petroleum - Manteca ' 983 Moffat Boulevard, Manteca, California ' 10. INTRODUCTION In accordance with the request of Mr Nick Bokides of Mel Bokides Petroleum, ' Advanced GeoEnvironmental, Inc (AGE), has prepared this quarterly report for the site located at 983 Moffat Boulevard, Manteca, California (Figure 1) This report presents the results of ground water monitoring activities conducted during October 2001 Ground water monitoring is being conducted at the site as required by the Central Valley Regional ' Water Quality Control Board (CVRWQCB) This report has been prepared in accordance with guidelines issued by the Regional Water Quality Control Board(RWQCB) Tri-Regional Board Staff Recommendations for Preliminary Investigations and Evaluation of Underground Tank Sates dated ' 10 August 1990 Background information and results of prior investigations at the site are in AGE's Preliminary Investigation and Evaluation Report(PIER), dated 09 March 1999, and Additional Sate Assessment Report, dated 21 March 2001 Ground water data from all previous quarterly monitoring events are included in the tables of this report 2.0 PROCEDURES ' On 30 October 2001, ground water monitoring for the last quarter 2001 was performed at the site The ground water monitoring activities include measurement of ground water levels and the collection of ground water samples from each of the site monitoring wells (MW-1, MW-2,MW-3, MW-4,MW-5,and MW-6)(Table 1) Ground water monitoring procedures for the site were outlined in Additional Site Assessment and Ground Water Extraction Pilot Test Work Plan, dated 31 May ' 2000, and conform to ground water monitoring guidelines issued by the San Joaquin County Environmental Health Department (EHD) 1 2 1 GROUND WATER DEPTH MEASUREMENT AND PURGING ' During the October 2001 monitoring event, depths to ground water were measured at each of the above noted wells from the tops of the well casings to the nearest 0 01-foot utilizing a Solinst water ' level meter Ground water elevations in each well at the site were calculated by subtracting the measured depth to ground water from the surveyed well casing elevations(Table 1) Ground water monitoring wells were purged using a disposable, dedicated plastic-bailer Approximately, four to ' six gallons of water were removed from monitoring wells MW-1 through MW-6, a minimum of three casing-water volumes per well Temperature, pH and conductivity of the purged water were measured at regular purge-volume intervals with an Oakton water analyzer Monitoring well field ' Advanced GeoEnvironmentat,Inc