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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 (cuoic feet <br /> per minute) for approximately 15 minutes Prior to the actual collection of the vapor <br /> sample the following data is recoraea 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-incn-diameter polyetnylene tubing (approximately 3 feet long), and sampling <br /> ports The bag sampler is a vacuum cnamber-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 oaroed brass connections threaded into a tapped <br /> hole in the system piping at seiectea locations <br /> Samples are collected by slipping one ena of the tubing over the sampling port and <br /> inserting the other end througn a comoression fitting in the bag samoler casing anc <br /> connecting it to the "Tedlar' baa The air sample contacts only the tubing The bag <br /> sampler is operated until the "Tealar' bag is filled to 314 of volume capacity The sample <br /> is placed in a non-refngeratea cry cooler with sufficient packing to eliminated damage <br /> during transport Cooling samples will cause condensation of moisture within the sample <br /> thereby distorting laboratory anaivsis <br /> To minimize the cotential for cross-contamination oetween air samples the polyethylene <br /> tuning ,s discaraea ana reolacea wan new tubino <br /> Vapor samples are subject to very limited holding times, typically 72 hours Therefore <br /> samples are suomitted to the laboratory on the same day of collection or on the <br /> following day, if unavoidable <br /> ATTACHMENTI"4WAPAIL 1886 <br />