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<br /> <br />m KLEINFELDER <br />A-4.2 Groundwater Sampling <br />Groundwater samples are collected from the monitoring wells at the site. The sampling protocol <br />for each well is as follows: <br />Down-well equipment (pumps, bailers, etc.) is decontaminated by steam cleaning, or by <br />scrubbing in a trisodium-phosphate or non-phosphate detergent wash followed by a <br />distilled water rinse, prior to use in each well. Bailer cord is replaced prior to use in each <br />well. <br />The depth to groundwater is measured using a conductivity-based water-level meter. <br />The volume of water in gallons standing in the well is calculated by subtracting the depth <br />to groundwater measurement from the depth of the well and multiplying by the <br />appropriate conversion factor (0.16 for 2-inch wells, and 0.65 for 4-inch wells). <br />Three to five well volumes of water are purged from each well using a submersible pump, <br />bladder pump, or Teflon bailer. <br />Physical parameters (pH, electrical conductivity, and temperature) are monitored for <br />stability while 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 />Samples are collected with a disposable bailer or bladder pump into appropriately <br />prepared bottles provided by the analytical laboratory. <br />Samples for metals analysis are usually filtered in the field at the time of collection. <br />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 />24134.E01 / ST03R304 Page A-7 <br />Copyright 2003, Kleinfelder, Inc. February 26, 2003