SITE INFORMATION AND CORRESPONDENCE

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_ [a o15 .12/05/2003 17:12 FAX 209 9431 kq KLEINFELDER 4. Three to five well volumes of water are purged from each well using a submersible pump,bladder pump, or Teflon bailer. 5. Physical parameters (pH, electrical conductivity, and temperature) are monitored for stability while purging. The physical parameter measurements are recorded on purge- 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. S. 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. S-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 -age is used to measure residual and implied preasure-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-ling of each lysimeter are measured 'ad the vacuums reset to manufactured recommcnded 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 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. A after the sample is coilected, the lysimeter vacuum is reset to the manufaeturar's recommended value. The lysimeter is also tested to evaluate potential leaks that may cause vacuum pressure loss. 0200'rR0P.ENV/8T03P4:3 December 5,2003 C 3003 K1eefelde:-,Inc. PDse vii Of giro- e,: 40"W" i,�t .».k 'L: �""`si,. . ,�P.' •�� :.