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C <br />meniscus forms when the bottle is completely full. A convex Teflon - <br />lined septum will be placed over the positive meniscus to seal the <br />container. After capping, the bottle will be inverted and tapped to <br />check that no air bubbles are present. All samples for organic <br />analysis will be collected in duplicate. The sample containers for <br />other parameters will be filled, preserved as required, and capped. <br />1 be collected with a <br />Stream samples will dipper in accordance with the <br />procedure described in Section 9 of Tes. Methods for Evaluating Solid <br />(EPA SW -846, 3rd edition, November <br />1986). These samples will be collected at midstream, mid -depth <br />locations in an upstream to downstream direction unless otherwise <br />directed. Surface -water samples will not be filtered. <br />In order to determine dissolved concentrations of the compounds <br />specified, appropriate field filtration techniques will be implemented <br />by attaching a disposable acrylic copolymer filter directly to the <br />pump effluent line with a high-pressure fitting. As the bladder pump <br />cycles, the effluent will be pressured through the filter and directed <br />into the appropriate containers. Each filter will be used only once <br />and then discarded. <br />When a Teflon bailer is used to collect ground -water samples, filtra- <br />tion will be performed by emptying the contents of the bailer into a <br />high-pressure transfer vessel. A disposable acrylic copolymer filter <br />will be threaded onto the transfer vessel at the discharge point, and <br />the vessel will be sealed. Pressure will be applied to the transfer <br />vessel with a hand pump, and the filterate will be directed into the <br />appropriate containers. Filters will be discarded after each use. <br />One field blank and -one trip blank (bottle blank) made with organic - <br />free water will be carried into the field and delivered with the <br />samples to the laboratory. The field blank will be opened in the <br />field during sample collection to detect any influences from the <br />ambient atmosphere on sample quality. The trip blank will remain with <br />B-6 <br />