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it Quarterly Report - First Quarter 2001, ' Bogetti's Orchard Service Station 2393 East Highway 132, Vernalis, California. I -1.0. INTRODUCTION At the request of Mr Albert Bogetti Advanced GeoEnvironmental, hie (AGE) has prepared 1 Quarterly Report -First Quarter 2001 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 2001 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 Sates dated 10 August 1990 rBackground information and previous site investigation activities, along with distribution of petroleum-impacted soil and ground water were presented in AGE's Preliminary Site Assessment Report-February 2000, dated 26 April 2000 I2.0. PROCEDURES Q,) 12 March 2001, ground water monitoring for the first quarter 2001 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 site monitoring wells MW-1, MW-2, MW-3, MW-4 and MW-5 (Table 1) The ground water monitoring event was performed in accordance"with guidelines ,x I established by the San Joaquin County Public Health Services - Environmental Health Division (PHS-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 Apr4 1999 , a 2 1 GROUND WATER DEPTH MEASUREMENT AND PURGING i During the March 2001 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 ` levels was performed prior to,conducting ground water-sampling at the site Ground water monitoring wells were purged using a pre-cleaned, two-stage submersible pump Approximately, seven to nine gallons of water were removed from monitoring wells MW-1 through MW-5, • approximately three casing-water volumes per well was evacuated Temperature, pH and Iconductivity of the purged water were measured at regular purge-volume intervals with a Hydac r