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S Quarterly Report - First Quarter 2004 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 r 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 ofthe 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 has been ' prepared in accordance with guidelines issued by the California Regional Water Quality Control Board - Central Valley Region (CRWQCB-CVR) for investigation of underground storage tank (UST) sites. A summary of previous investigations at the site was included in Quarterly Report - ' Third Quarter 2002, dated 13 November 2002, prepared by AGE; ground water monitoring data acquired to date is included in the tables of this report. 2.0. GROUND WATER MONITORING PROCEDURES '. On 23 January 2004, ground water monitoring and sampling were performed at the site on ground water monitoring wells MW-1 through MW-4; additionally, grab ground water samples were collected from off-site domestic water wells located on 451 and 452 N. Lillian Ave on 29 January i ' 2004. Monitoring well construction details are summarized in Table 1. Ground water monitoring procedures for the site were performed as outlined in Monitoring Well Installation Work Plan - September 1999, dated 01 September 1999, prepared by AGE and approved by the EHD by letter ' dated 23 September 1999. 2.1. WELL MONITORING AND EVACUATION Depths to ground water were measured in each well from the top of the well casing to the nearest ' 0.01-foot utilizing a Solinst water level meter;ground water elevation was calculated by subtracting the measured depth to ground water from the surveyed casing elevation (Table 2). Ground water ' elevations were plotted and contoured on a scaled site map (Figure 3). After water levels were measured, approximately 4'/z to 5'/4 gallons of ground water(a minimum of three casing water-volumes per well)were evacuated(purged)from wells MW-1 through.MW-4 by lowerin and raisin a 518=inch-outer diameter len th-discrete of eth lene hose eq ui ed with a g g� g p Y Y q pP ball-valve water tip through each monitoring well screen section. A Watera-Hydro-Lift II pump ' equipped with a mechanical arm was utilized to surge the polyethylene hose. Temperature,pH and conductivity were measured for stabilization at regular purge-volume intervals from each well using an Oakton water analyzer. Field data and logs are in Appendix A. Purged ground water was ' - Advanced GeoEnvironmental,Inc. 1