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�J Well Sampling A Teflon bailer or bladder pump will be the only equipment acceptable for well sampling. When samples for volatile organic analysis are being collected with a bladder pump, the pump flow will be regulated to approximately 100 milliliters per minute to minimize pump effluent 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 is 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. To determine dissolved concentrations of metals, appropriate field filtration techniques will be used. When a Teflon bailer is used, the sample will be filtered by emptying the contents of the 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. Pressure 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 discarded. When a bladder pump is used to collect samples for dissolved constituents, the sample will be filtered by attaching a disposable 0.45-micron acrylic copolymer filter directly to the pump effluent line with a pressure fitting. As the pump cycles, the effluent will be pressured through the filter and directed into the appropriate containers. Each filter will be used once and discarded. Spring (or Surface Water) Sampling If sufficient flow is observed, spring (or surface water) samples will be collected with a dipper consistent with the procedures listed in Section 9 of the document entitled Test Methods for Evaluating Solid Waste: Physical/Chemical Methods, SW-846, 3rd edition, November 1986. If low-flow conditions are encountered, a stainless steel scoop will be used to collect samples. The flat bottom of the scoop will be pressed against the bank and the water will flow with little disturbance into the scoop. Samples collected with a dipper or scoop will be transferred into the appropriate sample containers. Spring (or surface water) samples will be filtered as required. Leachate Sampling If leachate sampling and analysis is required, samples will be collected after purging approximately one casing volume using a Teflon bailer. Leachate samples will be filtered AOL as required and transferred into the appropriate containers. SAC/pjft93M390040.8e1-95 Ifc:3 A-4 Rev.0 February 14, 1995