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h'9 KLEINFELDER <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 inrunediately 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 /> A-5 VADOSE ZONE MONITORING <br /> 1. Prior to conducting lysimeter sampling, the pressure-vacuum equipment is checked and <br /> cleaned. A Soil-Moisture hand pump with a pressure-vacuum gage is used to measure <br /> residual and implied pressure-vacuum. Nitrogen gas is used to purge the lysimeter <br /> system for sampling. An air pump is available as a back up. <br /> 2. Approximately one week to one month prior to conducting the sampling, the residual <br /> pressures at the air-line of each lysimeter are measured ad the vacuums reset to <br /> manufactured recommended value (usually 50 centibars). The measurements and applied <br /> vacuums are noted on a sampling log form. Kleinfelder has found that resetting the <br /> lysimeters vacuums before the sampling yields good sample recovery. <br /> 3. The residual pressures are measured just prior to collecting the sample. The water line is <br /> then opened and nitrogen gas applied to the air line until either fluid or air is discharged <br /> (for dry lysimeters). The sample is contained in a 1 liter unpreserved bottle and the <br /> volume recovered is estimated. The fluid is then poured into appropriate preserved or <br /> unpreserved bottles of the requested analysis. <br /> 4. After the sample is collected, the lysimeter vacuum is reset to the manufacturer's <br /> recommended value. The lysimeter is also tested to evaluate potential leaks that may <br /> cause vacuum pressure loss. <br /> 27125.E01 /ST03R657 Page A-7 <br /> Copyright 2003,Kleinfelder,Inc. May 23,2003 <br />