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' Quarterly Report - First Quarter 2002 • Bogetti's Orchard Service Station - ' 2393 East Highway 132, Vernalis, California ' 1.0. INTRODUCTION At the request of Mr Albert Bogetti,Advanced GeoEnvironmental, Inc (AGE) has prepared this ' quarterly report for the Bogetti's Orchard Service Station site located at 2393 East Highway 132, Vernalis,California(Figure 1) This report presents the results of ground water monitoring activities ' conducted during March 2002 The purposes of the quarterly ground water monitoring program are to assess site ground water for seasonal variation of elevation, gradient and flow direction, and to assess the impact of petroleum hydrocarbon compounds on groundwater beneath the site 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 previous site investigation activities, along with distribution of petroleum-impacted soil and ground water were presented in AGE's Preliminary Site Assessment lie Report -February 2000, dated 26 April 2000 2.0. PROCEDURES IOn 01 March 2002,groundwater monitoring for the first quarter 2002 was performed at the site The ground water monitoring activities include measurement of ground water levels and collection of ground water samples from each of the monitoring wells MW-1 through MW-5 (Table 1) The ground water monitoring event was performed in accordance with guidelines established by the San Joaquin County Environmental Health Departments (EHD) and Central Valley Regional Water Quality Control Board (CVRWQCB) and were performed in accordance with the approved Preliminary Site Assessment Work Plan, dated 15 April 1999 I 21 GROUND WATER DEPTH MEASUREMENT AND PURGING During the March 2002 sampling event a Solinst water level meter was used to measure the depth to ground water in the monitoring wells relative to the tops of the well casings After the depth-to- ground water measurements were collected, casing water in the monitoring wells was evacuated using a pre-cleaned, two-stage submersible pump Approximately seven to nine gallons of water were removed from each of the monitoring wells,equivalent to 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 logs are included in Appendix A I