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Quarterly Report - First Quarter 2006 <br /> . Former BLUE STAR GASOLINE <br /> ' 4040 East Main Street, Stockton, California <br /> ' 1.0. INTRODUCTION <br /> At the request of Mr Khalid Anber, Advanced GeoEnvironmental, Inc (AGE) has prepared this <br /> report of environmental activities conducted at 4040 East Main Street, Stockton, California(site) <br /> The scope of work included the performance of a quarterly ground water monitoring event and <br /> preparation of this report The site and surrounding area are illustrated on figure 1 Soil borings, <br /> ' former underground storage tanks(USTs),and monitoring well locations are illustrated on Figure 2 <br /> Site background information is summarized in Appendix A <br /> • 2.0. PROCEDURES <br /> ' Field work was performed in accordance with guidelines issued by the Central Valley Regional <br /> Water Quality Control Board(CVRWQCB)for the investigation of underground storage tank(UST) <br /> sites and by the San Joaquin County Environmental Health Department(EHD) for the sampling of <br /> ground water monitoring wells <br /> ' • 2 1 PURGE WATER DISPOSAL <br /> ' On 04 January 2006, American Valley Waste Oil, Inc of Delhi, California pumped approximately <br /> 200 gallons of purge water from drums on-site A copy of the non-hazardous waste manifest is <br /> included in Appendix B <br /> y <br /> 2 2 WELL MONITORING AND EVACUATION <br />' On 08 March 2006, the depths to ground water in monitoring wells MW-1 through MW-3 were <br /> measured from the tops of the well casings to the nearest 0 01-foot utilizing a Solinst water level <br />' meter Ground water elevation in each well was calculated by subtracting the measured depth to <br /> ground water from the surveyed casing elevation(Table 1) <br />' After water levels were measured, approximately 6 5 to 9 gallons of water (a minimum of three <br /> casing water volumes per well) were purged from wells MW-1 through MW-3 using a Waterra <br />' inertia pump and dedicated tubing Ground water temperature,pH,and conductivity were measured <br /> for stabilization at regular intervals during purging using an Oakton water analyzer Field sheets and <br /> data are included in Appendix C Purged water was stored on-site in properly labeled, Department <br />' of Transportation (DOT)-approved 55-gallon drums pending proper disposal N <br /> i <br /> Advanced CeoEnwronmental,Inc <br /> 1 <br />