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1 <br /> KLEINFELDER <br /> File No. 20-3769-01 <br /> March 16, 1994 <br /> 1. Down-well equipment (pumps, bailers, etc ) is decontaminated by steam cleaning, or <br /> by scrubbing in a tnsodium-phosphate wash followed by a distilled water rinse, prior <br /> to use in each well Bailer cord is replaced prior to use in each well. <br /> 2. The depth-to--water is measured using a conductivity-based water-level meter. <br /> 3. The volume of water standing in the well is calculated by subtracting the depth-to-water <br /> measurement from the depth of the well and multiplying by the appropriate conversion <br /> factor (3.14 *radius , 0.16 for 2-inch wells, and 0.65 for 4-inch wells). <br /> 4. Three to five well volumes of water are purged from each well using a submersible <br /> pump, bladder pump, or Teflon bailer. <br /> 5. Physical parameters (pH, electrical conductivity, and temperature) are monitored for <br /> stability during purging. The physical parameter measurements are recorded on purge- <br /> and-sample logs, along with the time and volume of water purged at each measurement. <br /> 6 Samples are collected with a disposable bailer or bladder pump into appropnately <br /> prepared bottles provided by the analytical laboratory. <br /> 7. Samples for metals analysis are usually filtered in the field at the time of collection. <br /> 8. Samples are immediately labeled and placed in an iced sample container. At the end <br /> of the day, the samples are delivered to the analytical laboratory under chain-of-custody <br /> control. Sample handling is described in more detain in Section A-2.4 <br /> COPYright 1994 Kleinfelder, Inc Page 5 of 6 <br />