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1 <br /> The pump, hose, and electrical leads were decontaminated before and between each well <br /> • purging by washing the exterior with a solution of laboratory grade detergent. The pump <br /> ' was flushed by pumping the solution through the pump and hose. The exterior of the <br /> pump, hose, and electrical leads were then rinsed with potable water. Potable water was <br /> pumped through the pump and hose. The pump was then rinsed with potable water. <br /> Afterg <br /> sampling ur in n of each well was conducted using new, clean, dedicated <br /> P g g P <br /> disposable polyethylene bailers. The bailers were then lowered into the wells via new <br /> ' dedicated poly cords, samples collected, and gently poured into two laboratory provided <br /> clean glass VOA vials. Each VOA vial was immediately sealed, checked for headspace, <br /> labeled with the date, time and location and placed in a cooler containing blue ice at 4° <br /> Celsius. <br /> ' The samples were transported under strict chain-of-custody protocol to GeoAnalytical <br /> Laboratories in Modesto, California for analysis. All samples were delivered to the <br /> analytical laboratory within three hours from their time of collection. Appendix A <br /> contains analytical data, chain-of-custody and QA/QC data. Tables 2 and 3 summarize <br /> the analytical results from the monitoring well samples for the June 19, 1998 sampling <br /> event. Analytical results from previous sampling events are presented in Table 4. <br /> 5.0 GROUNDWATER ANALYTICAL RESULTS <br /> 1� <br /> 5.1 Laboratory Analysis of Ground Water Samples <br /> All ground water samples were submitted to GeoAnalytical Laboratories of Modesto, <br /> California and were analyzed for the following constituents by the indicated methods: <br /> t • Total Petroleum Hydrocarbons (TPH) - Gasoline, Method 5030/LUFT <br /> Detection limit 0.05 mg/L. <br /> Benzene, Toluene, Ethyl benzene, Xylenes (BTEX), EPA Method 602 <br /> ' Detection limits 0.3 pg/L BTE, 0.6 gg/L X. <br /> The detection limits quoted above are the minimum reportable levels specified by the <br /> ' analytical laboratory. The presence of other hydrocarbons may raise the detection limits <br /> for particular constituents. Refer to the laboratory data sheets in Appendix A for sample <br /> specific detection Iimits. <br /> f ' <br />} <br /> CA95DE-029 American Geological Services, Inc. <br /> ' <br /> 7 <br /> 1 <br />