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Quarterly Report - Fourth Quarter 2000 PACIFIC PRIDE I3230 North West Lane, Stockton, California 1.0. INTRODUCTION AND SCOPE OF WORK At the request of Mr David Atwater of Van De Pol Enterpnses,Advanced GeoEnvlronmental, Inc I (AGE)has prepared this quarterly report for 3230 North West Lane (the site), Stockton, California The report documents procedures and results for subsurface investigation conducted at the site during December 2000 (fourth quarter 2000) The site setting is illustrated on Figure 1 Site structures and monitoring well locations are depicted on Figure 2 ' The objective of the fourth quarter 2000 investigation was to characterize, assess and monitor concentrations of dissolved petroleum hydrocarbons in ground water and to characterize ground water flow direction and gradient at the site This report was prepared in accordance with guidelines established by the San Joaquin County Public Health Services - Environmental Health Division (PHS-EHD) and by the California Regional Water Quality Control Board - Central Valley Region (RWQCB) for sampling ground water monitoring wells and investigation of underground storage I tank (CYST) sites, respectively A summary of previous investigations conducted at the site was included in Preliminary Investigation and Evaluation Report, dated 11 November 1999, prepared by AGE I 2.0. QUARTERLY GROUND WATER MONITORING AND SAMPLING IOn 28 December 2000, ground water monitoring and sampling were performed on wells MW-1, MW-2 and MW-3, ground water elevation, flow direction and gradient were determined from the Ifield data 2 1 MONITORING WELL PURGE PROCEDURES I Depths to ground water were measured in wells MW-1, MW-2 and MW-3 from the tops of the well casings to the nearest 0 01-foot utilizing a Solmst 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 I well casing elevations (Table 1) Ground water elevations were plotted and contoured on a scaled site map (Figure 3) After water levels were measured, approximately 5 to 6 gallons of ground water(a minimum of three casing-water volumes per well) were removed from wells MW-1, MW-2 and MW-3 utilizing a disposable teflon bailer Temperature, pH and conductivity were measured for stabilization from each well using a Hydac water analyzer Field data and logs are included with Appendix A Purged • IAdvanced GeoEnvironmental,Inc I