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h� 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 /> 1. 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 /> 2. The depth to groundwater is measured using a conductivity-based water-level meter. <br /> 3. 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 /> 4. Three to five well volumes of water are purged from each well using a submersible pump, <br /> bladder pump, or Teflon bailer. <br /> 5. 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 /> 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 /> 204587-02.WP2/2002R489 Page A-7 <br /> Copyright 2002,Kleinfelder,Inc. June 6,2002 <br />