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1 <br /> lie, <br /> , - <br /> Quarterly Ground Water Monitoring Report - Second Quarter 2001 <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 report for 632 South El Dorado Street, Stockton, <br />' California(the site) This report documents the quarterly monitoring results for May 2001 The site <br /> setting is illustrated on Figure 1 The locations of structures and monitoring wells on the site are <br /> depicted in Figure 2 <br />' Background information, including details of previous site assessment work, was presented in <br /> previous AGE reports including, Corrective Action Plan, dated 15 November 1995, Quarterly <br />' Report - March 1996, dated 05 April 1996 and in Quarterly Report-June 1998, dated September <br /> 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 conform to ground water <br />' monitoring guidelines issued by the San Joaquin County Public Health Services - Environmental <br /> Health Division (PHS-EHD) <br />' In addition, field work was conducted in accordance with the PHS-EHD-approved work plan <br /> .Installation of Depth Discrete Wells, dated 10 December 1999 <br />' 2 1 MONITORING WELL PURGING PROCEDURES <br />' On 15 May 2001, i Solmst water level meter was used to measure the depth to ground water in eight <br /> monitoring wells (MW-1 through MW-8) and four vapor wells (VW-1 through VW-4) The top of <br /> the screened intervals in wells MW-1 through MW-3 are approximately 15 feet below the ground <br /> water surface therefore the wells were not purged or sampled at the request of the PHS-EHD <br /> After ground water depth measurements, a minimum of three casing-water volumes of water were <br />' removed from wells MW-4 through MW-8 and VW-1 through VW-4 using a submersible pump <br /> Temperature,pH, and electrical conductivity were measured at regular intervals using a Hydac water <br /> analyzer 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 /> a , <br /> 1 <br />