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Quarterly Report - First Quarter 2001 PACIFIC PRIDE 3230 North West Lane, Stockton, California I1.0. INTRODUCTION AND SCOPE OF WORK ' At the request of Mr David Atwater of Van De Pol Enterprises,Advanced GeoEnvironmental, Inc (AGE) has prepared tlus quarterly report for 3230 North West Lane (the site), Stockton, California The report documents procedures and results for ground water monitoring activities conducted at the site during March 2001 (first quarter 200 1) The site setting is Illustrated on Figure 1 Site structures and monitoring well locations are depicted on Figure 2 ' The objective of this first quarter 2001 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 California Regional Water Quality Control Board (RWQCB) - Central Valley Region for investigation of underground storage tank (UST) sites A summary of previous investigations conducted at the site was included in Preliminary Investigation and Evaluation IReport, dated 11 November 1999, prepared by AGE 2.0. QUARTERLY GROUND WATER MONITORING AND SAMPLING On 22 March 2001, ground water monitoring and sampling were performed at the site on wells IMW-1, MW-2 and MW-3 Ground water monitoring procedures for the site were outlined in Monitoring Well Installation Work Plan - February 2000, dated 01 February 2000, prepared by AGE and approved by the San Joaquin County Public Health Services-Environmental Health Division (PHS-EHD) by letter dated 16 February 2000 I21 MONITORING WELL PURGE PROCEDURES 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 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 well 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 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 Oakton water analyzer Field data and logs are included with Appendix A Purged Advanced GcoEnvironmental,Inc