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i 5. Physical parameters (pH, electrical conductivity, and temperature) are monitored. for stability while purging. The physical parameter measurements are recorded on prge- 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. A-5 Vadose Zone Monitorin 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 vacuruns .reset to manufactured recommended value (usually 50 centibars). The measurements and applied I 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 just 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. A-6_ Leachate Monitoring j 1. The leachate riser or wells are first opened and allowed to equilibrate with the f 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 rim of the casing. 3. A leachate sample is then collected using a clean, disposable bailer. l I - i [2280.MON I ST03RI875 Page A-G 0 2004,Kleinfelder,Inc. February 9,2004 KLEINFELDER 2825 East Myrtle Street, Stockton, CA 95205-4794 (209)948-1345 (209)948-0621 fax