Laserfiche WebLink
i <br /> Quarterly Report - First Quarter 2001 <br /> RAINWATER CAR WASH <br /> ' 420 West Yosemite Avenue, Manteca, California <br /> ' 1.4. INTRODUCTION <br /> ' Advanced GeoEnvironmental, Inc (AGE)has prepared this quarterly report for the first quarter of <br /> 2001 for 420 West Yosemite Avenue, Manteca, California The site setting is illustrated on Figure <br /> 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 /> ' 2.0. GROUND WATER MONITORING AND SAMPLING PROCEDURES <br /> On 31 January 2001, ground water monitoring and sampling was perforaned at the site on wells <br /> ' MW-1, MW-2, MW-3, MW-4 and MW-5 (MW-1 through MW-5) Ground water monitoring <br /> procedures for the site were outlined in Work Plan Addendum -August 1999, dated 10 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 /> Depths to ground water were measured in each well from the tops of the well casings at the site to <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 12 gallons of ground water (a minimum of <br /> ' three casing water-volumes per well) were removed from wells MW-1 through MW-5 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 Field <br /> ' data and logs are included with Appendix A Purged ground water was containerized in 55-gallon <br /> drums and was stored on-site in an area lacking general public access <br /> 1 <br /> Advanced GeoEnv ronmental Inc <br />