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\ r <br /> r Quarterly Report - Second Quarter 2004 <br /> Former STOCKTON PLATING Facility <br /> 632 South El Dorado Street, Stockton, California <br /> ,r <br /> f <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 ground water monitoring results for May <br /> 2004 The site setting is illustrated on Figure 1 The locations of structures and monitoring wells on <br />' the site are depicted on Figure 2 <br /> Background information including details ofprevious site assessment work is presented in Appendix <br />' A Results from current and previous ground water monitoring events are included in the tables of <br /> this report <br /> v <br /> 2.0. PROCEDURES <br /> Monitoring and sampling was performed in accordance with guidelines issued by the Central Valley <br /> Regional Water Quality Control Board (CVRWQCB) and conforms to ground water monitoring <br /> guidelines issued by the San Joaquin County Environmental Health Department(EHD) In addition, <br /> field work was conducted in accordance with the EHD-approved work plan Installation of Depth <br /> Discrete Wells, dated 10 December 1999 <br /> I <br /> 2 1 WELL MONITORING AND PURGING <br /> On 27 May 2004,a Solinst water level meter was used to measure the depth to ground water in seven <br /> monitoring wells(MW-2 through MW-8)and four vapor wells(VW-I through VW-4),well MW-1 <br />' was not accessible at the time of the quarterly monitoring event , <br /> After ground water depth measurements, a minimum of three casing-water volumes of water were <br /> removed from monitoring"wells MW-4 through MW-8 using dedicated polyethylene tubing and a <br /> Waterra inertia pump , The top of the screened interval in wells MW-1' through MW-3 was <br /> approximately 15 feet below static water level, therefore, these wells were not purged or sampled <br /> Temperature,pH,and electrical conductivity were measured at regular purge-volume intervals using <br />' an Oakton water analyzer Purge water stabilization field data sheets are`included in Appendix B <br /> Purged water was transferred from a Departmerit of Transportation(DOT)-approved 5 5-gallon drum, <br /> into the on-site ground water treatment system for disposal <br /> 1 Advanced GeoEnvironmental,Inc <br /> 1' y a <br />