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I ' Quarterly Report - April 1999 MARLOWE PROPERTIES ' 4648 East Waterloo Road, Stockton, California ' 1.0. INTRODUCTION AND SCOPE OF WORK Advanced GeoEnvuronmental,Inc (AGE)has prepared this Quarterly Report for 4648 East Waterloo ' Road, Stockton, California The site setting is illustrated on Figure 1 Site structures and monitoring well locations are depicted on Figure 2 ' The objectives of the work were to monitor dissolved petroleum hydrocarbon concentrations in ground water, to characterize ground water flow direction and gradient, and to determine the I effectiveness of soil vapor extraction (SVE)/In-situ air sparging (IAS)remediation at the site This report is prepared in accordance with guidelines established by the San Joaquin County Public Health Services- Environmental Health Division (PHS-EHD) and by the Central Valley Regional Water Quality Control Board (CVRWQCB) for investigation of underground storage tank (UST) sites A summary of previous investigations at the site was included in the Quarterly Report -April 1996, dated 12 June 1996, prepared by AGE r • 2.0. GROUND WATER MONITORING AND SAMPLING PROCEDURES ' On 26 April 1999, ground water monitoring was performed on wells MW-1 through MW-6 and I VW-1, ground water sampling was performed at wells MW-1, MW-3, MW-4, MW-5, MW-6 and VW-1 Ground water monitoring and sampling procedures for the site were outlined in the Monitoring Well Installation Work Plan -August 1996, dated 23 August 1996 prepared by AGE and approved by the PHS-EHD by letter on 11 October 1996 21 MONITORING WELL PURGE PROCEDURES Depths to ground water were measured in each well from the tops of the well casings at the site to the nearest 0 01 foot utilizing a Solinst water level meter Ground water elevations in each well at the site were calculated by subtracting the measured depth to ground water from the surveyed casing elevations (Table 1) Ground water elevations were plotted and contoured on a scaled site map I (Figure 3) ' After water levels were measured, approximately 16 to 101 gallons of ground water(a minimum of three well-volumes per well) were removed from wells MW-1, MW-3, MW-4, MW-5, MW-6 and VW-I utilizing a grundfos reds-flo submersible pump Ground water pumping was initiated at depth Ito ground water and slowly lowered to total depth to purge ground water within the entire well . casing Temperature, pH and conductivity were measured for stabilization at regular purge-volume intervals from each well using an ICM Model 52200 water analyzer Field data and logs are included Advanced GeoEnvironmental,Inc