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convex Teflon septum is placed over the positive meniscus to eliminate air. After the <br />bottle is capped, it is inverted and tapped to verify that it contains no air bubbles. The <br />sample containers for other parameters will be filled, filtered as required, and capped. <br />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 dedicated bladder pump is used to collect samples for dissolved constituents, the <br />sample will be filtered by attaching a disposable 0.45 -micron acrylic copolymer filter <br />directly to the pump effluent line. As the pump cycles, the effluent will be pressured <br />through the filter and directed into the appropriate containers. Each filter will be used once <br />and discarded. <br />Spring (or Surface Water) Sampling <br />If sufficient flow is observed, g(or surface water) samples spring les will be collected with a <br />P P <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 not be filtered. <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 tYPa of analytical parameter. Container types and <br />materials will be selected to be nonreactive with the particular analytical parameter tested. <br />SAC\N NPJ0039M390031.9BG-94 sdg:4 D-4 Rev. 0, 420/95 <br />