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Well Sampiing • �-� _ i i 4 C A Teflon bailer wil3_be the_only equipment accep#ablCfor well sampf lig. 1 When samples for volatile organic analysis are being collected, the'flow of ground water from the bailer will. be regulated to minimize turbulence,and" . aeration. Glass bottles of at "least 40-milliliters volume and. fitted with Teflon-lined septa will be used in sampling for volatile organics. These bottles will be filled completely to prevent air from remaining in the bottle. A positive meniscus forms when the bottle is completely full. A convex Teflon septum will be placed over the positive meniscus to eliminate air. After the bottle is capped, it is inverted and tapped to verify that it contains no air bubbles. The sample containers_ for other parameters will be filled, filtered as required, and capped. When required, dissolved concentrations of metals will be determined. using appropriate field filtration techniques. Samples will be filtered by emptying the contents of the Teflon bailer into a pressure transfer vessel. A disposable 0.45-micron acrylic copolymer filter will be threaded onto the transfer vessel at the discharge point, and the vessel will be sealed. Pres- sure will be applied to the vessel with a hand pump and the filtrate will be directed into the appropriate containers. Each filter will be used once and. • 0 discarded. Sample Preservation and Handling The following section specifies sample containers, preservation methods, and sample handling procedures. Sample Containers and Preservation - Sample containers vary with each type of analytical parameter. Container types and materials will be selected to be nonreactive with the particular analytical parameter tested. Sample Handling Sample containers will be labeled immediately following collection. ,Sam- • pies will be kept cool with cold packs until received by the laboratory. At the time of sampling, each sample will be logged on a ARCO chain-of-cus- tody record that will accompany the sample to the laboratory. Samples will be transferred from the site to a ARCO-approved laboratory PRO P91 L028.DOC Rev. 0 February 8, 1992 j`.