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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 est reach a stabihzed air flow(cubic feet per minute)for <br /> approximately 15 minutes Prior to the actual collection of the vapor sample, the following data is <br /> 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 1/4- <br /> mch diameter polyethylene tubing(approx nnately 3 feet long), and sampling ports The bag sampler is <br /> a vacuum chamber-based sampler which fills the sample bag by applying a vacuum to the outside of the <br /> sample bag (sample does not contact pump internals) The sampling ports are barbed, brass <br /> connections, threaded into a tapped hole in the systempipmg at selected locations <br /> Samples are collected by slipping one end of the tubmg over the sampling port and rnsertmg the other <br /> end through a compression fimg in the bag sampler casing and connecting it to the "Tedlar" bag The <br /> air sample contacts only the tubing The bag sampler is operated until the "Tedlar"bag is filled to 3/4 of <br /> volume capacity The sample is placed in a non-refrigerated dry cooler with sufficient packing to <br /> eliminated damage during transport Cooling samples will cause condensation of moisture within the <br /> sample,thereby distorting laboratory analysis <br /> To minimae the potential for cross-contammation between air samples, the polyethylene tubing, is <br /> discarded and replaced with new tubing <br /> Vapor samples are subject to very limned holding times, typically 72 hours Therefore, samples are <br /> submitted to the laboratory as soon as p <br /> Fugo West.Inc <br /> SOP-9cVNovember 1994 <br />