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FUGRO WEST, INC. <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 <br /> to the outside of the sample bag (sample does not contact pump internals) The sampling ports <br /> are barbed, brass connections, threaded into a tapped hole in the system piping at selected <br /> locations <br /> Samples are collected by 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 /> "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 /> To minimize the potential for cross-contamination between air samples, the polyethylene tubing, <br /> is 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 /> Fugro West tnc <br /> SOP-9c/November 1994 <br />