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COLLECTING LABORATORY SAMPLES <br /> Influent Sample <br /> The influent sample is obtained from a sample port located, after <br /> the system vacuum pump and before the REMOX Unit . Sterile poly <br /> tubing is then used to attach a 3 liter tedlar bag, fitted with a <br /> special septum "valve" and tubing bib, to the sample port . The <br /> sample port is on the pressure side of the pump and therefore the <br /> bag will fill without need of a pump. Once the tedlar bag is <br /> filled, its valve is closed and locked, the appropriate label is <br /> placed on the tedlar bag <br /> Effluent Sample <br /> A sample port for the effluent is located in the exhaust stack of <br /> the Remox system The flow pressure from the exhaust is great <br /> enough to fill a tedlar bag Sterile poly tubing is fitted to <br /> the exhaust port and the tedlar bag Then the sample valve of <br /> the tedlar bag is opened and the bag is filled with the sample . <br /> Once the tedlar bag as full, the valve is closed and locked, the <br /> sample port closed, and the appropriate label is placed on the <br /> g <br /> The labels for both the influent and effluent tedlar bag samples <br /> show the date, time, sample IDS# and analyses to be run. <br /> Both the influent and effluent tedlar bag samples are then placed <br /> within a cooler, on ice, and are hand delivered to WEGE' s <br /> laboratory that same day <br /> The vapor sample as then in3ected into an FID (Flame Ionizing <br /> Detector) chromatograph and the resulting chromatogram compared <br /> to standard chromatograms of known TFH (Total Fuel Hydrocarbons, <br /> gasoline) and BTEX (benzene, toluene, ethylbenzene, and xylenes) <br /> concentrations A duel chromatograph comparison is also run <br /> (Photovac lOS50) to evaluate BTEX, TCE, PCE, and DCE. <br /> ON CTrPP hNIAT.vele <br /> Besides bag samples collected for the WEGE laboratory some <br /> samples may be run on site using a Photovac lOS50 PID (Photo <br /> Ionizing Detector) chromatograph <br /> ine influent and effluent samples are collected from the same <br /> ports as the bag samples but 60 cc syringes are used to collect <br /> the sample and 0 . 5 cc of the vapor sample are then injected <br /> directly into the PID chromatograph. The resulting chromatogram <br /> is then compared to a standard run on the same chromatograph <br /> prior to the sample run. <br /> page 4 of R603, 03/22/95 <br />