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Quarterly Report - First Quarter 2007 Former BLUE STAR GASOLINE STATION 4040 East Main Street, Stockton,California 1.0. INTRODUCTION At the request of Mr. Khalid Anber,Advanced GeoEnvironmental, Inc. (AGE) has prepared this report of environmental activities conducted at 4040 East Main Street, Stockton, California(site). The scope of work included the performance of a quarterly ground water monitoring event, submission of monitoring and analytical data to the State Water Resources Control Board's GeoTracker information management system, and preparation of this report. The site and surrounding area are illustrated on Figure 1;soil borings,former underground storage tanks(USTs), and monitoring well locations are illustrated on Figure 2. Site background information is included in Appendix A. 2.0. PROCEDURES Field work was performed in accordance with guidelines issued by the Central Valley Regional Water Quality Control Board(CVRWQCB)for the investigation of underground storage tank(UST) sites and by the San Joaquin County Environmental Health Department(EHD)for the sampling of ground water monitoring wells. Ground water monitoring and sampling procedures were outlined in the AGE-prepared Revised Monitoring Well Installation Workplan, dated 19 March 2004. 2.1. WELL MONITORING AND EVACUATION On 12 March 2007, the depths to ground water in monitoring wells MW-1 through MW-3 were measured from the tops of the well casings (well heads) to the nearest 0.01-foot utilizing a Solinst water level meter. Ground water elevation in each well was calculated by subtracting the measured depth to ground water from the surveyed casing elevation (Table 1). After water levels were measured, approximately 9.5 to 12 gallons of water(a minimum of three casing water volumes per well) were purged from wells MW-1 through MW-3 using a Waterra inertia pump and dedicated tubing. Ground water temperature,pH,and conductivity were measured for stabilization at regular intervals during purging using an Oakton water analyzer. Field sheets and data are included in Appendix B. Purged water was stored on-site in properly labeled,Department of Transportation(DOT)-approved 55-gallon drums pending proper disposal. 2.2. COLLECTION AND ANALYSIS OF GROUND WATER SAMPLES Ground water samples were collected from each well using the dedicated WaTerra tubing after Advanced GeoEnvironmental,Inc.