ARCHIVED REPORTS XR0011652 - Laserfiche WebLink

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k'q KEEINFELDER A-5 VADOSE ZONE MONITORING 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 lysimeter 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 lysimeter 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 pnor 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 lysimeter vacuum is reset to the manufacturer's recommended value The lysimeter is also tested to evaluate potential leaks that may ' cause vacuum pressure loss A-6 LEACHATE MONITORING ' 1 The leachate riser or wells are first opened and allowed to equilibrate with the atmosphere 2 The leachate elevation is then measured from a set location using a conductivity-based water-level meter The level is generally measured from a surveyed mark on the north nm of the casing ' 3 A leachate sample is then collected using a clean, disposable bailer 4 The sample is labeled and immediately stored in an iced cooler pending transport to the ' analytical laboratory The sample is logged on a chain-of-custody 1 28699 E01 /ST03R627 Page A-8 Copynght 2003,Klemfelder,Inc Apnl 22,2003