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' Quarterly Report - Third Quarter 2002 <br /> Bogetti's Orchard Service Station <br />' 2393 East Highway 132, Vernalis, California <br />' 1.0. INTRODUCTION <br /> At the request of Mr Albert Bogetti, Advanced GeoEnvironmental, Inc (AGE) has prepared this <br />' quarterly report for the Bogetti's Orchard Service Station site located at 2393 East Highway 132, <br /> Vernalis,California(Figure 1) This report presents the results of groundwater monitoring activities <br />' conducted during July 2002 <br /> The purposes of the quarterly ground water monitoring program are to assess site ground water for <br />' seasonal variation of elevation, gradient and flow direction, and to assess the impact of petroleum <br /> hydrocarbon compounds on groundwater beneath the site This report is prepared in accordance with <br /> guidelines established by the Regional Water Quality Control Board(RWQCB)Tri-Regional Board <br /> Staff Recommendations for Preliminary Investigations and Evaluation of Underground Tank Sates <br /> dated 10 August 1990 Background information and previous site investigation activities are <br /> presented in Appendix A <br /> 2.0. PROCEDURES <br /> I • On 25 July 2002, ground water monitoring was performed at the site The ground water monitoring <br /> activities include measurement of ground water levels and collection of ground water samples from <br /> Ieach of the monitoring wells MW-1 through MW-5 (Table 1) The ground water monitoring event <br /> was performed in accordance with guidelines established by the San Joaquin County Environmental <br /> Health Departments(EHD)and Central Valley Regional Water Quality Control Board(CVRWQCB) <br /> and were performed in accordance with the approved Preliminary Site Assessment Work Plan, dated <br /> 15 April 1999 <br /> 2 1 GROUND WATER DEPTH MEASUREMENT AND PURGING <br /> During the July 2002 sampling event a Solinst water level meter was used to measure the depth to <br /> ground water in the monitoring wells relative to the tops of the well casings After the depth-to- <br /> ground water measurements were collected, casing water in the monitoring wells was evacuated <br /> using new, dedicated , disposable polyethylene bailers Approximately nine gallons of water were <br /> removed from each of the monitoring wells, equivalent to three casing-water volumes per well <br /> I Temperature, pH and conductivity of the purged water were measured at regular purge-volume <br /> intervals with an Oakton water analyzer Monitoring well field logs are included in Appendix B <br /> Purge water generated from the site monitoring wells was contained on-site in appropriately labeled <br /> 55-gallon drums <br /> • <br /> I <br /> I <br />