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N s I IQuarterly Report - First Quarter 2001 • CALIFORNIA FUELS CARDLOCK STATION µ' ' r�, i !159 I2402 Pacific Avenue, Stockton, California ' 1.0. INTRODUCTION Advanced GeoEnvironmental,Inc (AGE)has prepared this quarterly report for 2402 Pacific Avenue, Stockton, California The site setting is illustrated on Figure 1 Site structures and monitoring well locations are depicted on Figure 2 ' The objective of the work was to monitor dissolved petroleum hydrocarbon concentrations in ground water, to characterize ground water flow direction and gradient and to monitor the effectiveness of ' soil vapor extraction (SVE) and in-situ air sparging (IAS) remediation at the site This report is prepared in accordance with guidelines established by the California Regional Water Quality Control Board- Central Valley Division (CRWQCB) for investigation of underground storage tank (UST) ' sites A summary of previous investigations at the site was included in the Corrective Action Plan-May 1998, dated 05 May 1998 and prepared by AGE Analytical data acquired to date is included in this report 2.0. GROUND WATER MONITORING AND SAMPLING PROCEDURES ' On 21 March 2001, ground water monitoring and sampling were performed at the site on wells MW-1, MW-2, MW-3,MW-4, MW-5, MW-6, MW-7, MW-8, MW-9, MW-10, MW-11, MW-12, MW-13, AW-lA, AW-113, AW-2A and AW-2B Ground water monitoring procedures for the site ' were outlined in Work Plan Addendum, dated 16 May 2000 and conform to ground water monitoring guidelines issued by the San Joaquin County Public Health Services - Environmental Health ' Division (PHS-EHD) ' 21 MONITORING WELL PURGE PROCEDURES Depths to ground water were measured at each of the above mentioned 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 uy subtracting the measured depth io ground water from the surveyed well casing elevations (Table 1) Ground water elevations were plotted and contoured on a scaled site map (Figure 3) After water levels were measured, approximately 7 to 24 gallons of ground water (a minimum of three casing-water volumes per well) were removed from the above mentioned wells utilizing a • submersible pump, ground water pumping was initiated at the top of the water column and the pump was slowly lowered to total depth to purge ground water within the entire well casing I