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2. Approximately one week to one month prior to conducting the sampling, the <br /> residual pressures at the air-line of each lysimeter are measured ad the vacuums <br /> reset to manufactured recommended value (usually 50 centibars). The <br /> measurements and applied vacuums are noted on a sampling log form. <br /> Kleinfelder has found that resetting the lysimeters vacuums before the sampling <br /> yields good sample recovery, <br /> 3. The residual pressures are measured just prior to collecting the sample. The <br /> water line is then opened and nitrogen gas applied to the air line until either fluid <br /> or air is discharged (for dry lysimeters). The sample is contained in a 1 liter <br /> unpreserved bottle and the volume recovered is estimated. The fluid is then <br /> poured into appropriate preserved or unpreserved bottles of the requested <br /> 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 <br /> may cause vacuum pressure loss. <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- <br /> based water-level meter. The level is generally measured from a surveyed mark <br /> on the north rim of the casing, <br /> I 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 <br /> transport to the analytical laboratory. The sample is logged on a <br /> chain-of-custody. <br /> A-7 SURFACE WATER MONITORING <br /> 1. Prior to collecting surface water samples, the depth of water is estimated at a <br /> designated location in the surface water body. <br /> 2. Surface water samples are collected directly from the stream or surface water <br /> using a clean unpreserved plastic bottle, disposable bailer, bailer, coliwasa, <br /> Dipstik TM, dipper., peristaltic pump, etc., or by directly filling the sample <br /> containers. Sampling equipment will either be disposable, dedicated or <br /> decontaminated in accordance with the above-defined decontamination <br /> protocols. Care is taken not to disturb the stream bottom and introduce <br /> sediment in the sample. The fluid is then poured into appropriate preserved or <br /> unpreserved bottles for the requested analysis. <br /> 67451.WP1 ST 06R295TB:Jv Page A-7 <br /> 2006 Kleinfelder, Inc. March 31,2006 <br />