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I <br />' Ground Water Monitoring Report - Second Quarter 2000 <br /> 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 /> IThe objectives of the work were to monitor dissolved petroleum hydrocarbon concentrations in <br /> ground water, to characterize ground water flow direction and gradient, and to assess the <br />' effectiveness of soil vapor extraction (SVE) remediation at the site This report is prepared in <br /> accordance with guidelines established by the San Joaquin County Public Health Services - <br /> Environmental Health Division (PHS-EHD) and by the Central Valley Regional Water Quality <br />' Control Board(CVRWQCB)for investigation of underground storage tank(UST)sites A summary <br /> of previous investigations at the site was Included in the AGE-prepared Quarterly Report -April <br /> 1996, dated 12 June 1996 <br /> I <br /> 2.0. PROCEDURES <br />'• On 30 June 2000, a ground water monitoring event was performed on wells MWA, MW-5, MW-6 <br /> and VW-1 Ground water monitoring and sampling procedures for the site are outlined in the <br /> Monitoring Well Installation Work Plan -August 1996, dated 23 August 1996,and approved by the <br /> PHS-EHD by letter dated 11 October 1996 On 14 July 2000 one confirmational soil probe boring <br /> was advanced at the site to assess the effectiveness of SVE remediation effort at the site Procedures <br /> I for advancing the soil boring are outlined in the AGE-prepared Confirmation Soil Boring WorkPlan, <br /> dated 30 May 2000 and approved by the PHS-EHD by letter dated 13 June 2000 <br /> 2 1 MONITORING WELL PURGE PROCEDURES <br /> Depths to ground water were measured to each well from the tops of the well casings to the nearest <br /> 0 01 foot utilizing a Sollnst water level meter The ground water elevation in each well was <br /> calculated by subtracting the measured depth to ground water from the surveyed casing elevations <br /> (Table 1) Ground water elevations were plotted and contoured on a scaled site map (Figure 3) <br /> After water levels were measured, approximately 8 to 15 gallons of ground water (a minimum of <br /> three casing water-volumes per well) were removed from wells MW-1, MW-5, MW-6 and VW-1 <br /> utilizing a Grundfos Redl-Flo submersible pump Ground water pumping was initiated at the top of <br /> the water column and slowly lowered to total depth to purge ground water within the entire well <br /> casing Temperature,pH and conductivity were measured for stabilization at regular purge-volume <br /> • intervals from each well using a Hydac water analyzer Field data and logs are included in Appendix <br /> Advanced GeoEnvi ron mental,.Inc <br />