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i <br /> Quarterly Report - March 1999 <br /> Former STOCKTON PLATING Facility <br />' 632 South El Dorado Street, Stockton, California <br />' 1.0. INTRODUCTION <br /> At the request of Mr Richard Leland of R and L Business Management of Stockton, Advanced <br />' GeoEnvironmental, Inc (AGE) has prepared this Quarterly Report of field activities performed at <br /> 632 South El Dorado Street, Stockton, California(the site) <br />' This report documents the quarterly momtonng results for March 1999 The site setting is illustrated <br /> in Figure 1 The locations of structures and monitoring wells on the site are depicted in Figure 2 <br />' Background information, including details of previous site assessment work, was presented in <br /> Corrective Action Plan-December 1995,prepared by AGE, and in Quarterly Report-March 1996, <br />' dated 05 April 1996, and in Quarterly Report-June 1998, dated September 1998 <br />' 2.0 PROCEDURES <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 for Depth Discrete Hydrocarbon Assessment, <br /> dated 06 June 1998 <br /> 21 MONITORING WELL PURGING PROCEDURES <br /> On 24 March 1999, a Solinst water level meter was used to measure the depth to ground water in all <br /> monitoring wells(MW-1 through MW-6) and vapor wells screened in ground water(VW-1 through <br /> VW-4) at the site I - <br /> IAfter ground water depth measurements, a minimum of three well volumes of water was removed <br /> from each of wells MW-3, MW-4, MW-5 and MW-6 and VW-1 through VW-4 using a submersible <br />�1 pump Wells MW-1 and MW-2 were not purged for sampling These wells have screen intervals <br /> approximately 15 feet below the upper level of the water table <br /> Approximately 6 to 65 gallons of water were removed from each well, according to the purge- <br /> volume requirements Temperature, H and electrical conductivity were measured in purged <br /> ter <br /> I at regular purge-volume intervals using an ICM water analyzer to monitor stabilization of these <br /> physical parameters Purge water stabilization field data sheets are included in Appendix A Purged <br /> • water was stored on-site in labeled DOT-approved 55-gallon drums <br /> Advanced GeoEnvironmental,Inc. <br /> I <br />