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CLEARWATER G R O U P, I N C. purging activities to insure that the sample is representative of the aquifer. Purging .will continue until' at least -three- well casing volumes have been removed, the physical parameters stabilize, or until the well ,completely- dewaters. Stability is defined as a change of less than 0.2 pH units.. less than 10% in micro mhos,. and less than 1.0 degree Centigrade. Wells which dewater or demonstrate a slow recharge, may be .sampled after fewer than : # three well volumes have been removed. . Well purging information will be recorded on a purge' .data sheet:. All meters 'Till be calibrated "daily. Purge water will.be stored on site in D.Q.T..approved 55'gallon -drums, sealed and labeled. -.The water will be removed to an appropriate'disposal -facility-by a licensed hauler. Ground water' samples will be collected immediately after purging or when- the well has recharged to at least 70% of its static water level. Samples will be collected using polyethylene bailers, either dis osable.or dedicated to the well. ; P _ Samples for analytes most,sensitive to volatilization will be' collected first. Water samples will be placed in the appropriate container for that analysis, labeled, documented on a chain of custody form and placed on ice'in a cooler for- transport to a state-approved analytical laboratory. To - prevent '• contamination of .the samples, CGI personnel will adhere to the .following procedures in the field:. • A new, clean pair of latex gloves will be used for each well to be sampled. • Groundwater samples will be collected in-the expected order of increasing degree of contamination. • When collecting samples for volatile organic analysis; CGI personnel.will Iminimize the amount of air passing through the sample. - This helps prevent the air from stripping the' volatiles from the water. Sample bottles should be filled by.slowly running the sample down the side of-the Ibottle until there is a conex meniscus over the mouth of the bottle. The lid is' then_ carefully screwed onto the-bottle such that no air bubbles are present within the bottler If a bubble. is present,'the- cap is removed"and Iadditional water is added to the sample container. After resealing the sample container,'if"bubbles. still are present inside, the sample container is discarded and the procedure is repeated. (0 I CLEARWAMR GROUP,INC. 4 April 28, 1995 I