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' 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 /> ' 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 three 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 four 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 December 19, 1997 sampling <br /> event. Analytical results from previous sampling events are presented in Table 4. <br /> lie <br /> 5.0 GROUND WATER 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 µg/l, BTE, 0.6 µg/L X. <br /> Methyl tertiary-Butyl Ether (MTBE), Ethanol, tertiary-Butanol, Di-isopropyl Ether <br /> ' (DIPE), Ethyl tertiary-Butyl Ether (ETBE), tertiary-Amyl Methyl Ether (TAME), <br /> EPA Method 8260. <br /> Detection Limits: 1.0 µg/L MTBE, DIPE, ETBE, and TAME, 10 µg/L Ethanol <br /> ' and tertiary-Butanol <br /> ' American Geological Services, Inc. <br /> CA95DE-029 <br /> ' 6 <br />