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�.• <br /> KLEINFELDER <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 flue 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 /> 7. Samples for metals analysis are usually filtered in the field at the time of <br /> collection. <br /> S. 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 <br /> chain-of-custody control. <br /> A-5 VADOSE ZONE MONITORING <br /> 1. Prior to conducting lysimeter sampling, the pressure-vacuum equipment is <br /> checked and cleaned. A Soil-Moisture hand pump with a pressure-vacuum gage <br /> is used to measure residual and implied pressure-vacuum. Nitrogen gas is used <br /> to purge the lysimeter system for sampling. An air pump is available as a back <br /> up. <br /> 2. Approximately one week to one month prior to conducting the sampling, the <br /> residual pressures at the air-line of each lysimeter are measured ad the vacuums <br /> reset to manufactured recommended value (usually 50 centibars). The <br /> rmeasurements and . applied vacuums are noted on a sampling log form. <br /> Kleinfelder has found that resetting the lysimeters vacuums before the sampling <br /> yields good sample recovery. <br /> 79658.GW11ST07R790/F13:Iv Page A-6 <br /> 0 2007 Kleinfelder October 2,2007 <br />