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r <br /> Quarterly Report September 1998 <br /> P - <br /> MARLOWE PROPERTY <br /> 4648 East Waterloo Road, Stockton, California <br /> 1.0. INTRODUCTION AND SCOPE OF WORK <br /> At the request of Mr Jonathan Marlowe,Advanced GeoEnvironmental,Inc (AGE)has prepared this <br /> Quarterly Report for 4648 East Waterloo Road, Stockton, California The site setting is illustrated <br /> on 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 <br /> prepared in accordance with guidelines established by the San Joaquin County Public Health <br /> Services - Environmental Health Division (PHS-EHD) and by the Central Valley Regional Water <br /> I Quality Control Board (CVRWQCB)for investigation of underground storage tank (UST) sates A <br /> s ' of previous investigations at the site was included in the Quarterly Report -April 1996, <br /> dated 12 June 1996, prepared by AGE <br /> 2.0. PROCEDURES <br /> • On 11 September 1998, ground water monitoring was performed at wells MW-1 through MW-6 and <br /> VW-1, ground water sampling was performed at wells MW-1, MW-5, MW-6 and VW-1 <br /> I <br /> 21 MONITORING WELL PURGE PROCEDURES <br /> I Depths to ground water were measured from the to of each well casing at the site to the nearest 0 01 <br /> � P g <br /> foot utilizing a Solinst water level meter Relative ground water elevations in each well at the site <br /> Iwere calculated by subtracting the measured depth to ground water from relative casing elevations <br /> (Table 1) Relative ground water elevations were plotted and contoured on a scaled site map (Figure <br /> 3) <br /> After water levels were measured, approximately 9 to 21 gallons of ground water (a minimum of <br /> three well volumes per well) were removed from wells MW-1, MW-5, MW-6 and VW-1 utilizing <br /> a two-stage submersible pump Temperature, pH and conductivity were measured for stabilization <br /> at regular purge volume intervals from each well using an ICM Model 52200 water analyzer <br /> I Stabilization data and field logs are included with Appendix A Purged ground water was <br /> containerized in 55-gallon drums and was stored on-sate an an area lacking general public access <br /> I <br /> i <br /> Advanced GeoEmironmental,Inc <br />