Laserfiche WebLink
K L E f N F E L D E R <br /> 4 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 immediately labeled and placed in an iced sample container At the end of <br /> the day, the samples are delivered to the analytical Iaboratory under chain-of-custody <br /> ' control <br /> A-5 VADOSE ZONE MONITORING <br />' I Prior to conducting lysimeter sampling, the pressure-vacuum equipment is checked and <br /> cleaned <br /> 2 A Soil-Moisture hand pump with a pressure-vacuum gage is used to measure residual and <br /> implied pressure-vacuum Nitrogen gas is used to purge the lysimeter system for <br /> sampling An air pump is available as a back up <br /> 3 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 />' 4 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 there poured into appropriate preserved or <br /> unpreserved bottles of the requested analysis <br /> 5 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 /> Icause vacuum pressure loss <br />' 18748 T02/ST02R420 Page B-6 <br /> C)2002 Kleinfelder, Inc August 29,2002 <br />