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' ATJ KLEINFELDER <br /> A-5 VADOSE ZONE MONITORING <br /> I <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 /> 1' 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 arc 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 dust 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 /> i <br /> ' A-6 LEACHATE MONITORING <br /> 1 The leachate riser or wells are first opened and allowed to equilibrate with the <br /> atmosphere <br /> ' 2 The leachate elevation is then measured from a set location using a conductivity-based <br /> ' water-level meter The level is generally measured from a surveyed mark on the north <br /> rim of the casing <br /> ' 3 A leachate sample is then collected using a clean, disposable bailer <br /> 4 The sample is labeled and immediately stored in an iced cooler pending transport to the <br /> ' analytical laboratory The sample is logged on a chain-of-custody <br /> 28699 E01 /ST03R627 Page A-8 <br /> ' Copyright 2003,Kleinfelder,Inc Apn122,2003 <br />