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r <br /> w <br /> 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 <br /> per minute) for approximately 15 minutes Prior to the actual collection of the vapor <br /> sample, the following data is recorded air flow, temperature, and pressure at collection <br /> ports and gauges <br /> The sampling equipment consists of a new 1-liter "Tedlar" bag, a bag sampler, a section <br /> of new 114-inch-diameter polyethylene tubing (approximately 3 feet long), and sampling <br /> ports The bag sampler is a vacuum chamber based sampler which fills the sample bag <br /> by applying a vacuum to the outside of the sample bag (sample does not contact pump <br /> internals) The sampling ports are barbed, brass connections, threaded into a tapped <br /> hole in the system piping at selected locations <br /> Samples are collected by slipping one end of the tubing over the sampling port and <br /> inserting the other end through a compression fitting in the bag sampler casing and <br /> connecting it to the "Tedlar' bag The air sample contacts only the tubing The bag <br /> sampler is operated until the "Tedlar" bag is filled to 314 of volume capacity The sample <br /> is placed in a non-refngerated dry cooler with sufficient packing to eliminated damage <br /> during transport Cooling samples will cause condensation of moisture within the sample, <br /> thereby distorting laboratory analysis <br /> To minimize the potential for cross contamination between air samples, the polyethylene <br /> tubing, is discarded and replaced with new tubing <br /> Vapor samples are subject to very limited holding times, typically 72 hours Therefore, <br /> samples are submitted to the laboratory on the same day of collection, or, on the <br /> following day, if unavoidable <br /> ATTACHMEW=P-9dAPRIL 1904 <br />