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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 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 /> 7 are Samples for metals analysis usually filtered in the field at the time of <br /> P Y Y <br /> collection <br /> 8 Samples are immediately labeled and placed In an iced sample container A <br /> t 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 <br /> 2 A S oil-Moisture h and p ump w ith a p ressure-vacuum gage is used to measure <br /> residual and implied pressure-vacuum Nitrogen gas is used to purge the <br /> lysimeter system for sampling An air pump is available as a back up <br /> 3 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 /> measurements 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 /> 28209 T091ST05R1323/DH Iv Page A-F <br /> ©2005, Kleinfelder, Inc October 21, 2005 <br />