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Quarterly Report - First Quarter 2001 Grewal's Market 4100 East Fremont Street, Stockton, California ' 1.0. INTRODUCTION ' Advanced GeoEnvironmental,Inc. (AGE) has prepared this quarterly report for 4100 East Fremont Street, 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 and to characterize ground water flow direction 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 Preliminary Investigation and Evaluation Report, dated 27 September 1999 and prepared by AGE. ' 2.0. PROCEDURES On 16 February 2001, ground water monitoring and sampling was performed at the site on wells MW-1, MW-2 and MW-3. Ground water monitoring procedures for the site were outlined in ' Monitoring Well Installation Work Plan - September 1999, dated 01 September 1999, prepared by AGE and approved by the PHS-EHD by letter dated 23 September 1999. ' 2.1. MONITORING WELL PURGE PROCEDURES ' Depths to ground water were measured at each of the 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 were calculated by subtracting the measured depth to 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 9 to 10 gallons of ground water (a minimum of three casing-water volumes per well) were removed from each well 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.Temperature,pH and conductivity of purged water were measured for stabilization at regular purge-volume intervals using a water analyzer. Field data and logs are included in Appendix A. Purged ground water was containerized ' in 55-gallon drums and was stored on-site in an area lacking general public access. Advanced GeoEnvironmental,Inc.