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i <br /> FUGRO WEST, INC. <br /> • STANDARD OPERATING PROCEDURES <br /> RE: VAPOR SAMPLING: 'TEDLAR" BAG SAMPLING TECHNIQUE <br /> SOP-9c <br /> Prior to vapor samoling, 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 recoraeo air flow, temperature and pressure at collection <br /> ports and gauges <br /> The sampling ecuioment consists c, a new 1 -liter 'Tedlar" bag, a bag sampler, a section <br /> of new 1l4-►ncti-a ameter polyethvie^e Tubing (approximately 3 feet long), and sampling <br /> ports The bag samoler is a vacuum chamber-based sampler which fills the sample bag <br /> oy applying a vacL.um to the outsice ct the samoie bag (sample aces not contact pump <br /> internals) The sampling ports are -.arced brass connections, threaded into a tapped <br /> hole in the system piping at seiected locations <br /> Samples are ccuected by slipping ,e ena of the tubing over the sampling port and <br /> inserting the otrne, end throuan a :impression fitting in the bag sampler casing and <br /> connecting it to ,-e "Tedlar" baa -ne air sample contacts only the tubing The bag <br /> sampler is operatea until the "Tea jar baa is filled to 314 of volume caoacity The sample <br /> is placed in a ncn-refrigerated M cccier with surficient packing to eliminated damage <br /> during transport :ooling samples mil cause ccnaensation of moisture within the sample, <br /> possioly distorting laboratory anaivsis <br /> 7o minimize the cctentiai for cross-cc ntamination oetween air samples the nolyetnylene <br /> tubing is discarcea and replacea wan new tubing <br /> Vaoor samples are subject to very meted hoidina times typically 72 hours Therefore <br /> samples are submated to the laaeratory as soon as possible <br /> Fugro West Inc <br /> SOP-9cioctooer 1994 <br />