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3 The volume of water standing in the well was calculated by subtracting the depth-to- <br /> water measurement from the depth of the well and multiplying by the appropriate <br /> conversion factor (3.14*radius2, 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 <br /> + measurement <br /> 6 Samples are collected with a disposable bailer or bladder pump into appropriately <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 of <br /> the day, the samples are delivered to the analytical laboratory under chain-of-custody <br /> control <br /> t <br /> 4� <br /> l� <br /> SAPROTO(1993) Page A-S <br /> 24-16024 l-000 <br /> copyright 1993 Kleinfelder, Inc <br /> 1 <br />