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• c _ ` CAMBRIA <br /> All equipment is steam-cleaned prior to use and air used for air-lifting is filtered to prevent oil entrained in <br /> the compressed air from entering the well. Wells that are developed using air-lift evacuation are not sampled <br /> until at least 24 hours after they are developed. <br /> Ground Water Sampling <br /> Depending on local regulatory guidelines,three to four well-casing volumes of ground water are purged prior <br /> to sampling. Purging continues until ground water pH, conductivity, and temperature have stabilized. <br /> Ground water samples are collected using bailers or pumps and are decanted into the appropriate containers <br /> supplied by the analytic laboratory. Samples are labeled, placed in protective foam sleeves, stored on <br /> crushed ice at or below 4°C,and transported under chain-of-custody to the laboratory. Laboratory-supplied <br /> trip blanks accompany the samples and are analyzed to check for cross-contamination. An equipment blank <br /> may be analyzed if non-dedicated sampling equipment is used. <br /> GATEMPLAMSOMWELLS-GW.WPD <br /> - i <br /> j <br /> I, <br /> i <br /> f Page 3 of 3 <br />