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r ' Quarterly Report - Second Quarter 2000 ' NOMELLINI CONSTRUCTION CO 1045 West Charter Way, Stockton, California ' 1.0. INTRODUCTION ' Advanced GeoEnvironmental, Inc (AGE) has prepared this quarterly report for 1045 West Charter L Way, 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, to characterize ground water flow direction and gradient and to monitor the effectiveness of ' soil vapor extraction (SVE) and in-situ air sparging (IAS) remediation at the site This report is prepared in accordance with guidelines established by the California Regional Water Quality Control Board- Central Valley Division (CRWQCB) for investigation,of underground storage tank (UST) ' sites A summary of previous investigations at the site was included in Quarterly Report-February 1996, ' dated 17 May 1996, prepared by AGE Analytical data acquired to date is included in this report ' ! 2.0. PROCEDURES ' On 19 April 2000, ground water monitoring and sampling were performed at the site on wells MW-1, MW-2, MW-3, MW-4, MW-5, MW-6 and MW-7 (MW-1 through MW-7) Ground water monitoring procedures for the site were outlined in Interim Work Plan, dated 10 July 1995 2 1 MONITORING WELL PURGE PROCEDURES ' Depths to ground water were measured at wells MW-1 through MW-7 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 13 to 18 gallons of ground water (a minimum of three casing water-volumes per well) were removed from wells MW-1 through MW-7 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 a Hydac water analyzer, dissolved oxygen was measured utilizing a YSI-55 • dissolved oxygen indicator Field data and logs are included in Appendix A Purged ground water was contamenzed in 55-gallon drums and was stored on-site in an area lacking general public access IAdvanced Geo Environmental,Inc r