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Quarterly Report - January 1999 • MARLOWE PROPERTY I4648 East Waterloo Road, Stockton, California I1.0. INTRODUCTION AND SCOPE OF WORK I Advanced GeoEnvrronmental,Inc (AGE)has prepared this Quarterly Report for 4648 East Waterloo Road, Stockton, Califorrua The site setting is illustrated on Figure 1 Site structures and monitoring well locations are depicted on Figure 2 The objective of the work was to momtor dissolved petroleum hydrocarbon concentrations in ground water and to characterize ground water flow direction and gradient on the site This report is I 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 I2.0. PROCEDURES ' On 08 January 1999, ground water monitoring was performed at wells MW-I through MW-6, ground water sampling was performed at wells MW-1, MW-5, MW-6 and VW-I 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 dated i I October 1996 I 21 MONITORING WELL PURGE PROCEDURES I Depths to ground water were measured in each well from the casco tops of the well s at the site to g the nearest 0 01 foot utilizing a Solinst water level meter Ground water elevations in each well at Ithe site were calculated by subtracting the measured depth to ground water from surveyed casing elevations (Table 1) Ground water elevations were plotted and contoured on a scaled site map (Figure 3) After water levels were measured, approximately 10 to 24 gallons of ground water (a minimum of I three well-volumes per well) were removed from wells MW-1, MW-5, MW-6 and VW-1 utilizing a two-stage submersible pump, the first two gallons of purged ground water from MW-1, MW-5, MW-6 and VW-1 were removed utilizing a teflon bailer and new rope Temperature, pH and I 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 with Appendix A Purged ground water was containerized in 55-gallon drums and was stored on-site in an area lacking general I Advanced CeoEnvironmental,Inc