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-12- <br /> Take presampling measurements: <br /> a. Measure the depth to the water surface from the <br /> top of the well pipe. <br /> Record current physical observations such as weather, <br /> odors and ground conditions around the well in the <br /> Field Log. <br /> 2 . 4 . 3 Allow sufficient time, as determined from well <br /> recovery rate studies, after purging for the well <br /> water levels to recover so that an adequate amount of <br /> sample can be taken. <br /> 2 . 4 . 4 For slow recharge wells which take more than 24 hours <br /> for a sufficient volume to recover , volatiles will be <br /> collected upon recovery of a sufficient volume to <br /> sample; likewise, the remaining required parameters <br /> are collected as additional water accumulates for <br /> adequate sampling. <br /> 2 . 4 . 5 Use the information obtained from the well recovery <br /> rate studies to establish a work schedule . <br /> 2 . 4 . 6 Take the scheduled samples in order of parameter <br /> volatility. ( See Table 3 . ) <br /> 2 . 4 .7 Measure the pH in the field from the first set of <br /> samples. Follow the vendor ' s directions for proper <br /> operation of test equipment . <br /> 2 . 4 . 8 Type of sampler used depends on the well . <br /> . Most shallow wells ( to 25 ft ) are sampled with <br /> bailers . <br /> . Deeper wells may have to be sampled with a portable <br /> bladder pump. <br /> . Most "B, " "C, " and "D"-zone wells have dedicated <br /> bladder pumps. <br /> 2 . 4 . 9 If a bailer is used, ease the bailer below the water <br /> surface. Use new clean string with a clean Teflon <br /> bailer. <br />