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`f J l Quarterly Report - Third 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 Pet9eum, Advanced GeoEnvironmental, Inc (AGE), has prepared this quarterly report for the site located at f 983 Moffat Boulevard, Manteca, California (Figure 1) This report presents the results of J�und water monitoring activities conducted during July 2041 On h y Ground water monitoring is being conducted at the site as required by the Central Valley Raponal ' Water Quality Control Board(CVRWQCB) This report is prepared in accordance with guidelines established by the Regional Water Quality Control Board (RWQCB) Tri-Regional Board Staff Recommendations for Preliminary Investigations and Evaluation of Underground Tank Sites 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 Site Assessment Report, dated 21'March 2001 Ground water data from subsequent quarterly monitoring reports are included in the tables of this report J 2.0 PROCEDURES r On 16 July 2401, groundwater monitoring for the first 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 Public Health Services - Environmental Health Division (PHS-EHD) 1 , 2 1 GROUND WATER DEPTH MEASUREMENT AND PURGING During the July 2041 sampling event an electric water level meter was used to measure the depth to ground water in each well relative to the top of the well casing Recording of ground water table ' levelb was purfurnied prior to Luridw ting ground water bairipling at the bile Ground water monitoring wells were purged using a disposable bailer Approximately, seven to seven and one-half gallons of water were removed from monitoring wells MW-1 through MW-6, an excess of three ' casing-water volumes per well was evacuated Temperature,pH and conductivity of the purged water were measured at regular purge-volume intervals with an Oakton water analyzer Monitoring well field logs are included in Appendix A Purge water generated from the site monitoring wells was , Advanced CeoEnvironmental,Inc 1