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1 • i <br /> ! Work Plan for Subsurface Investigation March 25 1999 <br /> . The Southland Corporation Store No 14117 Stockton California Wage 3 <br /> 1 Following monitoring, a field instrument will be used to determine dissolved oxygen levels in the wells Then, <br /> each well will be purged prior to sampling During purging, temperature, pH, and conductivity of the purged <br /> ! water will be measured, until measurements have stabilized After stabilization of purge water parameters, the <br /> wells will be allowed to recharge to within 80 percent of static level, and then groundwater samples will be <br /> collected from each well Water samples will be obtained using dedicated disposable bailers and clean string <br /> ! The samples will be collected into 40-milliliter glass volatile organic analysis (VOA) vials, filled to zero <br /> headspace, acidified to a pH of 2, sealed with Teflon septa and screw-on caps, labeled, and placed on ice in <br /> an insulated container for shipment under legal chain-of-custody to a state-certified laboratory for BTEX, MTBE, <br /> 1 and TPH-G analysis by modified EPA methods 8020/8015, and TSA MTBE, DIPE, ETBE, and TAME by EPA <br /> method 8260 <br /> ' REPORTING <br /> 1 Within four to six weeks of receipt of all field and analytical findings, IT Corporation will prepare a report <br /> summarizing the data collected under the scope of work detailed above The report will document the methods <br /> and results of the work, summarize laboratory analytical results and include appropriate maps <br /> ' Field work will commence within four weeks of written regulatory agency approval of th s scope of work <br /> M <br />' 1 <br /> i <br /> 1 <br /> 1 <br /> 1 <br /> 1 <br /> 1 <br /> 1 <br />