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S„ <br /> r <br /> Quarterly Ground Water Monitoring Report - First Quarter 200'0 <br /> Former STOCKTON PLATING Facility <br /> 632 South El Dorado Street, Stockton, California �w <br /> 10. INTRODUCTION <br /> CID -J <br /> � n <br /> At the request of Mr Richard Leland of R and L Business Management of Stockton, Advanced <br /> GeoEnvironmental, Inc (AGE) has prepared this report for 632 South El Dorado Street, Stockton, <br /> California(the site) during the first quarter of 2000 This report documents the quarterly monitoring <br /> Iresults for January 2600 The site setting is illustrated in Figure 1 The locations of structures and <br /> monitoring wells on the site are depicted in Figure 2 <br /> IBackground information, including details of previous site assessment work, was presented in <br /> Corrective Action Plan - December 1995, dated 15 November 1995, and in Quarterly Report - <br /> March 1996, dated 05 April 1996, and in Quarterly Report--June 1998, dated September 1998, all <br /> prepared by AGE <br /> I2 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-EH D-approved work plan Installation of Depth Discrete Wells, dated <br /> 10 December 1999 <br /> 2 1 MONITORING WELL PURGING PROCEDURES <br />` On 24 January 2000, a Solinst water level meter was used to measure the depth to ground water in <br /> five monitoring wells (MW-4 through MW-8) and four vapor wells (VW-I through VW-4) screened <br /> within ground water at the site <br /> After ground water depth measurements, a minimum of three well volumes of water were removed <br /> I from wells MW-4 through MW-8 and VW-1 through VW-4 using a submersible pump The top of <br /> the screened interval in wells MW-I through MW-3 are approximately 15 feet below the ground <br /> water surface and, therefore,'were not purged nor sampled on concurrence with the PHS-EHD <br /> IA minimum of three casing volumes of water were removed from each well, between 9 and 30 <br /> gallons Temperature,pH,and electrical conductivity were measured in purged water at three or five- <br /> gallon intervals using a Hydac water analyzer to monitor for stabilization of these physical <br /> parameters Purge water stabilization field data sheets are included in Appendix A Purged water was <br /> stored on-site in labeled DOT-approved 55-gallon drums <br />' Advanced GeoEn-*nronmcntal,Inc <br /> I1 <br />