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1 1' <br />' Quarterly Report - March 1998 <br /> MARLOWE PROPERTY <br /> 4648 East Waterloo Road, Stockton, California <br />' 10. INTRODUCTION AND SCOPE OF WORK <br /> In accordance with a request from Mr Jonathan Marlowe,Advanced GeoEnvironmental, Inc (AGE) <br /> has prepared this Quarterly Report for 4648 East Waterloo Road, Stockton, California The location <br /> of the site and the immediately suriounding area are illustrated on Figure I Site structures and <br />' 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 the Central Valley Regional Water <br />' Quality Control Board (CVRWQCB) for investigation of underground storage tank (UST) sites A <br /> summary of previous investigations at the site was included in the Quaff iei ly Report -Apr d 1996, <br /> dated 12 June 1996, prepared by AGE <br /> I <br /> . 20 PROCEDURES <br /> 2 1 MONITORING WELL PURGE PROCEDURES <br /> On 09 March 1998, the depth to ground water was measured to the nearest 0 01 foot from the tops <br /> of the well casings in monitoring wells MW-1 through MW-6 and VW-1 utilizin a Solmst water <br /> level meter Ground water elevations from MW-1 through MW-6 were calculated by subtracting the <br /> measured depth to ground water from the surveyed casing elevations (Table 1) Ground water <br /> elevations with respect to mean sea level were plotted and contoured on a scaled site rnap (Figure <br /> After water levels weie ineasuled, appioximately 10 to 21 gallons of ground water (a minimum of <br /> three well volumes per well) v,eie removed from wells MW-1, MW-5, MW-6 and V W-1 utilizing <br /> a two-stage submersible pump Temperature, pH and conductivity were measured for stabilization <br /> at regular intervals from each well using an ICM Model 52200 water analyzer Dissolved oxygen <br /> in purged water was nieasuied at each well using a YSI Model 55 Dissolved Oxygen Meter at the <br /> conclusion of each purge process Stabilization data and field logs are included with Appendix A, <br /> dissolved oxygen field measurements are listed in Table 2 Purged ground mater was containerized <br /> in 55-gallon drums and was stored on-site in an area lacking general public access <br /> • <br /> Atli anced GcoEnwonmenlal,Inc <br />