ARCHIVED REPORTS_XR0007456 CASE 1

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h� KLEI NFELDER ' B-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 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 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 B-6 Leachate Monitorin 1 The leachate riser or wells aie first opened and allowed to equilibrate with the ' atmospheie 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 rim of the casing i3 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 20-1417-16 E01/201911338 Page B-7 ©1999, Kleinfelder Inc May 12 1999 r