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00 0` <br /> k` ■ KLEINFELDER <br /> B-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, <br /> or by scrubbing in a trisodium-phosphate or non-phosphate detergent wash <br /> followed by a distilled water rinse, prior to use in each well. Bailer cord is <br /> replaced prior to use in each well. <br /> 2. The depth to groundwater is measured using a conductivity-based water-level <br /> meter. <br /> 3. The volume of water in gallons standing in the well is calculated by subtracting <br /> the depth to groundwater measurement from the depth of the well and multiplying <br /> by the appropriate conversion factor (0.16 for 2-inch wells, and 0.65 for 4-inch <br /> wells). <br /> 4. Three to five well volumes of water are purged from each well using a <br /> submersible pump, bladder pump, or Teflon bailer. <br /> 5. Physical parameters (pH, electrical conductivity, and temperature) are monitored <br /> for stability while purging. The physical parameter measurements are recorded on <br /> purge-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 <br /> collection. <br /> 8. Samples are immediately labeled and placed in an iced sample container. At the <br /> end of the day, the samples are delivered to the analytical laboratory under chain- <br /> of-custody control. <br /> 20-YP8-160/2018P 182/20180356 Page B-7 <br /> © 1998, Klein@Ider, Inc. August 4, 1998 <br />