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C AMB RIA <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 evacuatlon 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 Ground <br /> water samples are collected using bailers or pumps and are decanted into the appropriate containers supplied <br /> by the analytic laboratory Samples are labeled, placed in protective foam sleeves, stored on crushed ice at <br /> or below 4°C, and transported under chain-of-custody to the laboratory Laboratory-supplied trip blanks <br /> accompany the samples and are analyzed to check for cross-contamination An equipment blank may be <br /> analyzed if non-dedicated sampling equipment is used <br /> I-13 EM PLATEISOPS\WhLLS-GW WPD <br /> Page 3 of 3 <br /> r <br />