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Quarterly Report - August 1999 THREE B'S TRUCK PLAZA 14749 Thornton Road, Lodi, California 1.0. INTRODUCTION AND SCOPE OF WORK Advanced GeoEnvironmental, Inc (AGE) has prepared this Quarterly Report for 14749 Thornton Road,Lodi, California The site setting is illustrated on Figure I Site structures and monitoring well locations are depicted on Figure 2 IThe 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 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 Preliminary Site Investigation and Evaluation Report - November 1996, dated 20 June 1997 and prepared by AGE Analytical data acquired to date is included in this report I . 2 0. QUARTERLY MONITORING AND SAMPLING PROCEDURES I On 13 August 1999 round water monitoring/sampling. rocedures were performed at wells MW-1 g � gP through MW-6 Grab ground water samples were collected from the domestic drinking water well located in a southwest section of the site in August, September and November 1999 Ground water monitoring procedures for the site were outlined in Work Plan Addendum - October 1998, dated 14 October 1998 prepared by AGE and approved by the PHS-EHD by letter dated 21 December 1998 I21 MONITORING WELL PURGE PROCEDURES Depths to ground water were measured in each well from the tops of the well casings at the site to Ithe 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 fiom surveyed casing elevations (Table 1) Ground water elevations were plotted and contoured on a scaled site map (Figure 3) I After water levels were measured,approximately 3 to 6 gallons of ground water(a minimum of three well-volumes per well) were removed from wells MW-1 through MW-6 utilizing a teflon hand bailer Temperature, pH and conductivity were measured for stabilization at regular purge-volume I 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 public access Advanced GeoEnvironmental,Inc