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KLEINFELOER 4 Three to five well volumes of water are purged from each well using a submersible pump, bladder pump, or Teflon bailer 5 Physical parameters (pH, electrical conductivity, and temperature) are monitored for stability while purging The physical parameter measurements are recorded on purge- and-sample logs, along with the time and volume of water purged at each measurement 6 Samples are collected with a disposable bailer or bladder pump into appropriately prepared bottles provided by the analytical laboratory 7 Samples for metals analysis are usually filtered in the field at the time of collection 8 Samples are immediately labeled and placed in an iced sample container At the end of the day, the samples are delivered to the analytical laboratory under chain-of-custody control B-5 Vadose Zone Monitorinsr 1 Prior to conducting lysimeter sampling, the pressure-vacuum equipment is checked and ' cleaned A Soil-Moisture hand pump with a pressure-vacuum gage is used to measure residual and Implied pressure-vacuum Nitrogen gas is used to purge the lyslmeter system for sampling An air pump is available as a back up 2 Approximately one week to one month prior to conducting the sampling, the residual pressures at the air-line of each lyslmeter are measured ad the vacuums reset to manufactured recommended value (usually 50 centibars) The measurements and applied vacuums are noted on a sampling log form Kleinfelder has found that resetting the lysimeters vacuums before the sampling yields good sample recovery 3 The residual pressures are measured dust prior to collecting the sample The water line is then opened and nitrogen gas applied to the air line until either fluid or air is discharged ' (for dry lysimeters) The sample is contained in a 1 liter unpreserved bottle and the volume recovered is estimated The fluid is then poured into appropriate preserved or unpreserved bottles of the requested analysis 4 After the sample is collected, the lyslmeter vacuum is reset to the manufacturer's recommended value The lyslmeter is also tested to evaluate potential leaks that may ' cause vacuum pressure loss i 20-1311-40 E01/2019R039 Page B-7 OO 1999,Kleinfelder,Inc January 20, 1999 r