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k' ■ KLEINFELDER <br /> A-4 Groundwater Monitoring <br /> A-4.1 Water Level Measurements <br /> Water level measurements are made in the wells prior to purging and sampling the <br /> wells. Measurement protocol is as follows: <br /> 1. The water level probe is decontaminated in a trisodium phosphate or non- <br /> phosphate detergent wash, followed by a distilled water rinse, prior to use in <br /> each well. <br /> 1 2. Water level measurements are made using a conductivity-based water-level <br /> meter. Depth-to-water is generally measured from a surveyed mark on the north <br /> rim of the PVC well casing. <br /> The water level measurements are converted to elevations using the surveyed casing <br /> elevations. <br /> A-4.2 Groundwater Sampling <br /> Groundwater samples are collected from the monitoring wells at the site. The sampling <br /> protocol for each well is as follows: <br /> 1. Down-well equipment (pumps, bailers, etc.) is decontaminated by steam <br /> cleaning, or by scrubbing in a trisodium-phosphate or non-phosphate detergent <br /> wash 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 <br /> multiplying by the appropriate conversion factor (0.16 for 2-inch wells, and 0.65 <br /> for 4-inch 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 <br /> on purge-and-sample logs, along with the time and volume of water purged at <br /> each measurement. <br /> 6. Samples are collected with a disposable bailer or bladder pump into <br /> appropriately prepared bottles provided by the analytical laboratory. <br /> 65078.T2/ST06R506/FB:ly Page A-6 <br /> ©2006 Kleinfelder, Inc. May 22, 2006 <br />