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When required, dissolved concentrations of metals will be determined <br />' using appropriate field filtration techniques. When a Teflon bailer is used, <br /> the sample will be filtered by emptying the contents of the bailer into a <br />' pressure transfer vessel. A disposable 0.45-micron acrylic copolymer filter <br /> will be threaded onto the transfer vessel at the discharge point, and the <br /> vessel will be sealed. Pressure will be applied to the vessel with a hand <br /> pump and the filtrate will be directed into the appropriate containers. Each <br /> filter will be used once and discarded. <br /> When a bladder pump is used to collect samples for dissolved con- <br /> stituents, filtering will be performed by attaching a disposable 0.45-micron <br /> acrylic copolymer filter directly to the pump effluent line with a pressure fit- <br /> ting. As the pump cycles, the effluent will be pressured through the filter <br /> and directed into the appropriate containers. Each filter will be used once <br />' and discarded. <br /> Sample Preservation and Handling <br /> The following section specifies sample containers, preservation methods, <br /> and sample handling procedures. <br /> Sa z)iie Containers and ?resenuaftn <br /> Sample containers vary with each type of analytical parameter. Container <br />' types and materials will be selected to be nonreactive with the particular <br /> analytical parameter tested. <br /> Sample Handling <br />' Sample containers will be labeled immediately following collection. Sam- <br /> ples will be kept cool with cold packs until received by the laboratory. Cold <br /> packs will be replaced each day to maintain refrigeration. At the time of <br /> sampling, each sample will be logged on a Sampling and Analysis Chain- <br /> of-Custody Record (see Figure C-4) that will accompany the sample to the <br /> laboratory. <br /> 1 Samples will be transferred from the site to a state-certified laboratory by <br /> the sampling team. Sample shipments from EMCON Associates to labora- <br /> tories performing the selected analyses routinely occur within 24 hours of <br /> sample receipt. The laboratory manager will check the holding times for <br /> requested analyses so that they are not exceeded. <br /> pjf1f921f920201 a C - 5 Rev. 0 June 1, 1992 <br />