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Ground Water Monitoring Report - First Quarter 2000 ' Grewal's Market 4100 East Fremont Street Stockton, California 1.0. INTRODUCTION i' Advanced GeoEnvironrrlental,Inc. (AGE)has prepared this quarterly ground water monitoring report for the property located at 4100 East Fremont Street (site), 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 and gradient on the site. This report is prepared in accordance with guidelines established by the San Joaquin County Public Health Services - ' Environmental Health Division (PHS-EHD) and by the Central Valley Regional Water Quality Control Board (CVRWQCB) for investigation of underground storage tank(UST) sites. Background information is summarized in the Preliminary Investigation and Evaluation Report, dated 27 ' September 1999 and prepared by AGE. 2.0. PROCEDURES ' On 07 February 2000, ground water monitoring and sampling was performed at the site on wells MWA, MW-2 and MW-3. Ground water monitoring procedures for the site were outlined in Monitoring Tlrell Installation TYork 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 wells MW-1, MW-2 and MW-3 from the tops of the well ' casings at the site to the nearest 0.01 foot utilizing a Solinst water level meter. Ground water elevations in each well at the site were calculated by subtracting the measured depth to round 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 10 gallons of ground water (a minimum of three r well-volumes per well) were removed from wells MW-1, MW-2 and MW-3 utilizing a submersible Grundfos Rediflo 11 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 were measured for stabilization at regular purge-volume intervals from each well using a Hydac water analyzer. Field data and logs are included with Appendix A. ' purged-ground water was containerized in 55-gallon drums and was stored on-site in an area lacking ` Advanced Geo£nvironmental,Inc. i'