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ti a a <br /> • Quarterly Report - Septem6er 1999 <br /> Former STOCKTON PLATING Facility <br /> 632 South E1 Dohdo Street, Stockton, California y <br /> h r <br /> 1.0. ' , INTRODUCTION L ' <br /> ` At the request of Mr Richard'Leland of R and L Business Management of Stockton, Advanced- <br />' GeoEnvlronmental, Inc (AGE) has prepared this Quarterly Report of field activities performed at <br /> 632 South El Dorado Street, Stockton, California (the site) during the third quarter of 1999 <br />' This report documents the quarterly monitoring results for September 1999 The site setting is <br /> n <br /> illustrated in Figure 1 The locations of structures and monitoring wells on the site are depicted in <br /> Figure 2 <br /> Background information, Including details of previous gate assessment work, was presented in <br />' Corrective Action Plan - December'1995, dated 15 November 1995, and in Quarterly Report - <br /> March 1996, dated OS April 1996, and In Quarterly Report -June 1995, dated September 1998, all <br /> prepared by AGE <br /> 2.0. PROCEDURES <br /> tie <br /> Monitoring and sampling were performed in accordance with guidelines established by the Central <br /> Valley Regional Water Quality Control Board (CVRWQCB) and by the San Joaquin County Public <br />' Health Services-Environmental Health Division(PHS-EHD) In addition, field work was conducted <br /> in accordance with the PHS-EHD-approved Work Plan forDepth Discrete Hydrocarbon Assessment, <br /> dated 06 June 1998 V <br /> 2 1 MONITORING WELL PURGING PROCEDURES ; <br /> r, <br /> On 24 September 1999, a Sollnst water level meter was used to measure the depth to ground water <br />' in six monitoring wells (MW-1 through MW-6) and four vapor wells (VW-1 through VW-4) ' <br /> "screened within ground water at the site i { <br />' After ground water depth measurements, a minimum of three well volumes of water were removed <br /> from wells MW-4 through MW-6 and VW-1 through VW-4 using a submersible pump The top'of <br /> T the screened interval in wells MW-1 through MW-3 are approximately 15 feet below the ground <br />' water surface and, therefore, were not purged nor sampled <br /> A'mlmmum of three casing volumes of water were removed from each well, between 9 and 24 <br />' <br /> 'gallons Temperature,pH, and electrical conductivity were measured in purged water at three-gallon <br /> intervals using an ICM water analyzer to monitor for stabilization of these,physlcal parameters ; <br /> v Advanced GeoEnviron mental,Inc ' <br /> 1 y <br />