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Alm Quarterly Report - Second Quarter 2005 Jai PACIFIC PRIDE- WEST LANE 3230 North West Lane, Stockton, California 1.0. INTRODUCTION AND SCOPE OF WORK At the request of Mr David Atwater of Van De Pol Enterprises,Advanced GeoEnvironmental, Inc (AGE)has prepared this 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 April 2005 (second quarter 2005) The site setting is illustrated on Figure 1 Site structures and monitoring well locations are depicted on Figure 2 The objective of this second quarter 2005 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 (CRWQCB) - 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 Report, dated 11 November 1999, prepared by AGE 2.0. QUARTERLY GROUND WATER MONITORING AND SAMPLING On 07 April 2005, ground water monitoring and sampling were performed at the site on wells MW-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 Environmental Health Department (SJCEHD) by letter dated 16 February 2000 21 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 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) After water levels were measured, approximately 3 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 ground water was containerized in 55-gallon drums and was stored on-site in an area lacking general public access Advanced GeoEnvironmental,Inc