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November 7, 1986 AGS 8691-3 <br /> Beacon Service Station #1-502 - Lodi, California <br /> Monitoring wells MW-1, MW-2, and MW-3 were developed prior to <br /> water sampling by air jetting combined with over pumping. The <br /> pump used was an air-lift submersible type. <br /> GROUND WATER WELL SAMPLING <br /> Following an initial water level measurement, well development, <br /> and ground water recovery to static conditions, the monitoring <br /> wells were sampled using an acetone-washed and distilled water- <br /> rinsed teflon bailer. The bailer was first used to obtain a <br /> sample from the surface of the water in each well prior to <br /> purging. These samples were then examined for hydrocarbon odor, <br /> sheen, emulsion, or floating product. Hydrocarbon odor was noted <br /> in water samples from MW-1 and MW-2, but MW-3 showed no <br /> subjective evidence of contamination. The bailer was cleaned <br /> after each use with acetone and distilled water. <br /> After subjective sampling, the wells were purged of approximately <br /> four well volumes and the formation water was sampled. Samples <br /> for chemical analysis were taken with the bailer after the water <br /> level in the wells rose to static conditions. The water samples <br /> were slowly transferred to laboratory-cleaned glass vials and <br /> sealed with teflon-lined lids, labeled, and immediately placed in <br /> 6 <br /> AAR1100' GeoSystems <br />