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EPLM <br /> STANDARD OPERATING PROCEDURES <br /> RE: VAPOR SAMPLING: "TEDLAR" BAG SAMPLING TECHNIQUE <br /> SOP-9C <br /> Prior to vapor sampling, the vacuum system must reach a stabilized air flow (cubic feet per <br /> minute) for approximately 15 minutes. Prior to the actual collection of the vapor sample, the <br /> following data is recorded: air flow, temperature, and pressure at collection ports and gauges. <br /> The sampling equipment consists of a new 1-liter "Tedlar" bag, a bag sampler, a section of new <br /> 114-inch-diameter polyethylene tubing (approximately 3 feet long), and sampling ports. The bag <br /> sampler is a vacuum chamber-based sampler which fills the sample bag by applying a vacuum to <br /> the outside of the sample bag (sample does not contact pump internals). The sampling ports are <br /> barbed, brass connections, threaded into a tapped hole in the system piping at selected <br /> locations. <br /> Samples are collected b <br /> P y slipping one end of the tubing over the sampling port and inserting the <br /> other end through a compression fitting in the bag sampler casing and connecting it to the <br /> "Tedlar" bag. The air sample contacts only the tubing. The bag sampler is operated until the <br /> I <br /> "Tedlar" bag is filled to 314 of volume capacity. The sample is placed in a non-refrigerated dry <br /> cooler with sufficient packing to eliminated damage during transport. Cooling samples will cause <br /> condensation of moisture within the sample, thereby distorting laboratory analysis. <br /> j To minimize the potential for cross-contamination between air samples, the polyethylene tubing, is <br /> discarded and replaced with new tubing. <br /> Vapor samples are subject to very limited holding times, typically 72 hours. Therefore, samples <br /> are submitted to the laboratory as soon as possible. <br /> i <br /> I <br /> I <br /> LAENSR\admin\S0P150P-9C.doc <br />