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CLEARWATER <br /> G R O U P I N C <br /> • <br /> purging activities to insure that the sample is representative of the aquifer. <br /> Purging will continue until at least three well casing volumes have been <br /> removed, the physical parameters stabilize, or until the well completely <br /> dewaters Stability is defined as a change of less than 0.2 pH units, less than <br /> 10% in micro mhos, and less than 10 degree Centigrade. Wells which <br /> dewater or demonstrate a slow recharge, may be sampled after fewer than <br /> three well volumes have been removed Well purging information will be <br /> recorded on a purge data sheet All meters will be calibrated daily Purge <br /> water will be stored on site in D O T approved 55 gallon drums, sealed and <br /> labeled. The water will be removed to an appropriate disposal facility by a <br />' licensed hauler. <br /> Ground water samples will be collected immediately after purging or when <br /> the well has recharged to at least 70% of its static water level Samples will be <br /> collected using polyethylene bailers, either disposable or dedicated to the well <br /> Samples for analytes most sensitive to volatilization will be collected first <br /> Water samples will be placed in the appropriate container for that analysis, <br /> labeled, documented-on a chain of custody form and placed on ice in a cooler <br /> for transport to a state-approved analytical laboratory To prevent <br /> contamination of the samples, CGI personnel will adhere to the following <br /> procedures in the field <br /> 0 A new, clean pair of latex gloves will be used for each well to be sampled <br /> 0 Groundwater samples will be collected in the expected order of increasing <br /> degree of contamination. <br /> ® When collecting samples for volatile organic analysis, CGI personnel will <br />' minimize the amount of air passing through the sample This helps <br /> prevent the air from stripping the volatiles from the water Sample <br /> bottles should be filled by slowly running the sample down the side of the <br />' bottle until there is a convex meniscus over the mouth of the bottle The <br /> lid is then carefully screwed onto the bottle such that no air bubbles are <br /> present within the bottle If a bubble is present, the cap is removed and <br /> additional water is added to the sample container After resealing the <br /> sample container, if bubbles still are present inside, the sample container is <br /> discarded and the procedure is repeated <br /> CLEARWATER GROUP,INC 4 December 16,1994 <br />