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To determine dissolved concentrations of metals, appropriate field filtration techniques <br /> will be used. When a Teflon bailer is used, the sample will be filtered by emptying the <br /> contents of the bailer into a pressure transfer vessel. A disposable 0.45-micron acrylic <br /> copolymer filter 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 pump and the <br /> filtrate will be directed into the appropriate containers. Each filter will be used once and <br /> discarded. <br /> When a bladder pump is used to collect samples for dissolved constituents, the sample <br /> will be filtered by attaching a disposable 0.45-micron acrylic copolymer filter directly to <br /> the pump effluent line with a pressure fitting. As the pump cycles, the effluent will be <br /> pressured through the filter and directed into the appropriate containers. Each filter will <br /> be used once and discarded. <br /> Spring (or Surface Water) Sampling <br /> If sufficient flow is observed, spring (or surface water) samples will be collected with a <br /> dipper consistent with the procedures listed in Section 9 of the document entitled Test <br /> Methods for Evaluating Solid Waste: Physical/Chemical Methods, SW-846, 3rd edition, <br /> November 1986. If low-flow conditions are encountered, a stainless steel scoop will be <br /> used to collect samples. The flat bottom of the scoop will be pressed against the bank and <br /> the water will flow with little disturbance into the scoop. Samples collected with a dipper <br /> or scoop will be transferred into the appropriate sample containers. Spring (or surface <br /> water) samples will be filtered as required. <br /> SAMPLE PRESERVATION AND HANDLING <br /> The following section specifies sample containers, preservation methods, and sample <br /> handling procedures. <br /> Sample Containers and Preservation <br /> Sample containers vary with each type of analytical parameter. Container types and <br /> materials will be selected to be nonreactive with the particular analytical parameter tested. <br /> Specific sample volume, container types, and preservation requirements are presented in <br /> Table A-1. <br /> Sample Handling <br /> Sample containers will be labeled immediately following collection. Samples will be kept <br /> cool with cold packs until received by the laboratory. Cold packs will be replaced each <br /> day to maintain refrigeration. At the time of sampling, each sample will be logged on a <br /> SAC/pjM39\D9390011.8a1-94/1fc:9 Rev.0, 10/17/94 <br /> 0939-001.18 A-4 <br />