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Section No 6 . <br /> Revision No 0 <br /> Date September 5, 1991 <br /> Page 24 of 55 <br /> ■ The bailer should be lowered into the well, allowed to completely <br /> fill with water, be raised from_ the well and them emptied into the - <br /> container used to contain waste sampling water Bailer should be <br /> rinsed three times in this manner before collecting the sample <br /> ` ■ When the bailer is drawn from the well for sampling, a steady stream <br /> of water, suitable for sampling, is released by pouring from the <br /> top. <br /> The containers needed for sampling will be specified-by the laboratory. <br /> Once opened, a container must be used at once for storage of a particular <br /> sample Unused but opened containers are to be considered contaminated and <br /> must be discarded Because of the potential for introduction of <br /> contamination they cannot be reclosed and saved for later use Likewise, any <br /> unused containers which appear contaminated upon receipt, or which are found <br /> to have loose caps or missing Teflon liners (if required for that container) • <br /> - - should be discarded or returned,- unused, - to the vendor -- The following- - <br /> specific guidelines for filling water sample containers are given Specific �- <br /> analyses to be performed on samples provided by MARK will be specified by <br /> MARK to the chemical laboratory <br /> Volatile Organic Constituents (VOCs) <br /> - Samples for VOCs are collected in 40-m1 glass vials equipped with <br /> Teflon-backed septum screw caps <br /> - When sampling for volatiles, the 40-m1 sample vials should have <br /> no headspace or bubbles Aeration or agitation of the sample <br /> should be avoided to the greatest possible extent To avoid <br /> aeration, the glass vial should be held at an angle so that the <br /> stream of water flows down the side. fill the vial until it <br /> overflows to eliminate any air bubbles and replace the Teflon- <br /> lined cap <br /> Turn the vial upside down and tap it to check for air bubbles. <br /> If any air bubbles are observed, empty and refill the vial and <br /> check for air' bubbles again Repeat this procedure until an <br /> acceptable sample is obtained <br /> 6-24 <br />