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'�• Ground Water Monitoring Report - Second Quarter 2001 <br /> I MARLOWE PROPERTIES <br /> 4696 East Waterloo Road (Formerly 4648 East Waterloo Road), Stockton, CA <br /> 1.0. INTRODUCTION AND SCOPE OF WORK <br /> Advanced GeoEnvironmental,Inc (AGE)has prepared this quarterly report for 4696 East Waterloo <br /> Road (Formerly 4648 East Waterloo Road), Stockton, California The site setting is illustrated on <br /> Figure 1 Site structures and monitoring well locations are depicted on Figure 2 <br /> The objectives of the work were to monitor dissolved petroleum hydrocarbon concentrations in <br /> ground water and to characterize ground water flow direction and gradient A summary of previous <br /> investigations at the site was included in the AGE-prepared Quarterly Report-April 1996, dated 12 <br /> June 1996 <br />' 2.0. PROCEDURES <br /> IThis report is prepared in accordance with guidelines established by the Central Valley Regional <br /> Water Quality Control Board (CVRWQCB) for investigation of underground storage tank (UST) <br /> sites Sampling of the ground water monitoring wells was conducted in accordance with guidelines <br /> •` issued by the San Joaquin County Public Health Services - Environmental Health Division <br /> (PHS-EHD) <br /> 2 1 MONITORING WELL PURGE PROCEDURES <br /> IOn 27 June 2001 depths to ground water were measured in wells MW-1 through MW-6 and vapor <br /> extraction well VW-1 from the tops of the well casings to the nearest 0 01-foot utilizing a Solinst <br /> I water level meter The ground water elevation in each well was calculated by subtracting the <br /> measured depth to ground water from the surveyed casing elevations (Table 1) <br /> After water levels were measured, approximately eight to twelve gallons of ground water (a <br /> minimum of three water-casing volumes) were removed from wells MWA, MW-5, and MW-6, <br /> approximately 35 gallons of water were removed from wells MW-2, MW-3 and MW-4, and 25 <br /> gallons of water were removed from well VW-1 utilizing a Grundfos Redi-Flo submersible pump <br /> Ground water pumping was initiated at the top of the water column and the pump was slowly <br /> lowered to total depth to purge ground water within the well casing Temperature, pH and <br /> conductivity were measured for stabilization at regular intervals from each well using a Hydac water <br /> analyzer Field data and logs are included in Appendix A Purged ground water was containerized <br /> in DOT-approved 55-gallon drums and was stored on-site in an area lacking general public access <br /> Advanced GeoEnvironmental,Inc <br /> I <br />