Laserfiche WebLink
..lL't3+w S.l 1-1 IJ <br /> 1 <br /> f <br /> Y I <br /> Quarterly Report - First Quarter 2000 <br /> I NOMELLINI CONSTRUCTION CO. <br /> 1045 West Charter Way <br /> Stockton, California <br /> 1.0. INTRODUCTION <br /> Advanced'GeoEnvironmentaI, Inc (AGE) has prepared this Quarterly Report for the site at 1045 <br /> West Charter Way, Stockton, California The site setting is illustrated on Figure 1 Site structures <br />' and monitoring well locations are depicted on Figure 2 <br /> The objective of the work was to monitor dissolved petroleum hydrocarbon concentrations in ground <br /> water, to characterize ground water flow direction and gradient on the site and to monitor the <br /> effectiveness of soil vapor extraction (SVE) and in-situ air sparging (IAS) remediation at the site <br /> This report is prepared in accordance with guidelines established by the San Joaquin County Public <br />' Health Services - Environmental Health Division (PHS-EHD) and by the Central Valley Regional <br /> Water Quality Control Board (CVRWQCB) for investigation of underground storage tank (UST) <br /> sites A summary of previous investigations at the site was included in the Quarterly Report - <br /> February 1996, dated 17 May 1996, prepared by AGE <br /> 2.0. PROCEDURES <br /> On 26 January 2000, ground water monitoring and sampling were performed at the site on wells <br /> MW-1,MW-2,MW-3, MW-4, MW-5, MW-6 and MW-7 Ground water monitoring procedures for <br /> the site were outlined in Interim Work Plan, dated 10 July 1995 <br /> 2 1 MONITORING WELL PURGE PROCEDURES <br />' Depths to groundwater were measured at wells MW-1, MW-2, MW-3, MW-4, MW-5, MW-6 and <br /> MW-7 from the tops of the well casings at the site to the nearest 0 01 foot utilizing a Solinst water <br /> level meter Ground water elevations in each well at the site were calculated by subtracting the <br /> measured depth to ground water from the surveyed well casing elevations (Table 1) Ground water <br /> Ielevations were plotted and contoured on a scaled site map (Figure 3) <br /> After water levels were measured, approximately 15 to 20 gallons of ground water (a minimum of <br /> three well-volumes per well) were removed from wells MWA, MW-2, MW-3, MW-4, MW-5, <br /> t MW-6 and MW-7 utilizing a two-stage submersible pump, ground water pumping was initiated at <br /> the top of the water column and the pump was slowly lowered to total depth to purge ground water <br /> within the entire well casing Temperature, pH and conductivity were measured for stabilization at <br /> regular purge-volume intervals from each well using a Hydac water analyzer Field data and logs are <br /> included in Appendix A Purged ground water was containerized in 55-gallon drums and was stored <br /> on-site in an area lacking general public access <br /> Advanced CeoEnstronmental,Inc <br /> I <br />