Laserfiche WebLink
The pump, hose, and electrical leads were decontaminated before and between each well <br /> l 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 /> After purging, sampling of each well was conducted using new, clean dedicated <br /> ' disposable polyethylene bailers. Distilled water was poured into the bailer used for each <br /> well and a bailer blank was collected prior to well sampling. The bailers were then <br /> lowered into the wells via new dedicated poly cords, samples collected, and gently <br /> ' poured into two laboratory provided clean glass VOA vials. Each VOA vial was <br /> immediately sealed, checked for headspace, labeled with the date, time and location and <br /> placed in a cooler containing blue ice at 4° 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 and chain-of-custody forms. Tables 2 and 3 summarize the <br /> analytical results from the monitoring well samples for the March 30, 1998 sampling <br /> ' event. Analytical results from previous sampling events are presented in Table 4. <br /> 5.0 GROUNDWATER ANALYTICAL RESULTS <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 /> • 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 µg/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 limits. <br /> American Geological Services, Inc. <br /> CA95DE-029 <br /> 6 <br />