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1 Quarterly Report July 1999 PAIGE'S TOWING ' . 1807 Douglas Road, Stockton, California ' 1.0. INTRODUCTION AND SCOPE OF WORK ' Advanced GeoEnvironmental, Inc. (AGE) has prepared this Quarterly Report for 1807 Douglas Road, Stockton, California. 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 monitor dissolved petroleum hydrocarbon concentrations in ground water and to characterize ground water flow direction and gradient on 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 Preliminary Site Investigation and Evaluation Report, dated 20 February 1996 and prepared by AGE. Z.O. PROCEDURES '• In July 1999, ground water monitoring and sampling was performed at wells MW-1, MW-2,MW-3, and MW-4. Ground water monitoring procedures for the site were outlined in Njork Plan Addendum ' -September 1998, dated 16 September 1998 and in Revision to Work Plan Addendum - September 1998, dated 16 March 1999 and approved by the PHS-EHD by letter on 29 March 1999. 2.1. MONITORING WELL PURGE PROCEDURES ' Depths to ground water were measured from the top of each well casing 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 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 six to eight gallons of ground water (a minimum of three well-volumes per well)were removed from wells MW-1, MW-2,MW-3 and MW-4 utilizing a two-stage submersible pump; ground water pumping was initiated at the top of the water column ' and the pump was 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 dataaand logs are in Appendix A. ' Purged ground water-was containerized in 55-gallon drums and was stored on-site in an area lacking general public access. 1 Advanced GeoEnvironmental,Inc,