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k%J K L E I N F E L 0 E R <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 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 <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 then 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 /> cause vacuum pressure loss <br /> 1 <br /> 1 <br /> • <br /> ' 18748 T021 ST03RO81 Page A-6 <br /> ®2003 K:lemfelder,Inc January 23,2003 <br /> 1 <br />