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Quarterly Report - Second Quarter 2001 <br /> RAINWATER CAR WASH <br /> ' 420 West Yosemite Avenue, Manteca, California <br /> ' 1.0. INTRODUCTION <br /> Advanced GeoEnviromental, Inc (AGE) has prepared this quarterly report for the second quarter <br /> of 2001 for 420 West Yosemite Avenue, Manteca, California The site setting is illustrated on <br /> Figure 1 Site structures and monitoring well locations are depicted on Figure 2 <br /> ' The objective of the work was to monitor dissolved petroleum hydrocarbon concentrations in ground <br /> water and to characterize ground water flow direction and gradient on the site This report is prepared <br /> ' in accordance with guidelines established by the California Regional Water Quality Control Board - <br /> Central Valley Division for investigation of underground storage tank (UST) sites Background <br /> information is summarized in the AGE-prepared Preliminary Investigation and Evaluation Report, <br /> ' dated 11 June 1999 <br /> ' Z.O. GROUND WATER MONITORING AND SAMPLING PROCEDURES <br /> On 30 April 2001, ground water monitoring and sampling was performed at the site on wells MW-1, <br /> ' MW-2, MW-3, MW-4, MW-5 and MW-6 (MW-1 through MW-6) Ground water monitoring <br /> procedures for the site were outlined in Woj k Plan Addendum -August 1999, dated 1 U August 1999, <br /> prepared by AGE and approved by the PHS-EHD by letter dated 25 August 1999 <br /> 2 1 MONITORING WELL PURGE PROCEDURES <br /> ' and water were measured in each well from the s at the site to tops of the well casings Depths to gra p g <br /> ' the nearest 0 01-foot utilizing a Solinst water level meter The ground water elevation in each well <br /> at the site was calculated by subtracting the measured depth to ground water from the surveyed <br /> casing elevations (Table 1) Ground water elevations were plotted and contoured on a scaled site map <br /> ' (Figure 3) <br /> After water levels were measured, approximately 6 to 13 gallons of ground water (a minimum of <br /> ' three casing water-volumes per well) were removed from wells MW-1 through MW-6 utilizing a <br /> teflon two-stage submersible pump Temperature, pH and conductivity were measured for <br /> stabilization at regular purge-volume intervals from each well using a Hydac water analyzer Copies <br /> ' of field data and logs are in Appendix A Purged ground water was containenzed in 55-gallon drums <br /> and was stored on-site in an area lacking general public access <br /> 4dvarnud[,coF nironmuit it Ini <br />