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N' <br /> ' VAPOR SAMPLING <br /> $ On site sample analysis is performed using a Photovac 10550 PID <br /> chromatograph. The chemical make up of the vapor produced at the <br /> site has changed with vapor extraction. The lightllhydrocarbons i <br /> have been depleted and the heavier hydrocarbons , are now the , <br /> dominate hydrocarbons being produce . Because of this, it is no <br /> longer. practical to perform on site analysis with th6 10S50 . <br /> ,a <br /> COLLECTING LABORATORY SAMPLES f � <br /> Influent Sample <br /> The influent sample is ';obtained from a sample port located;: after s <br /> the system vacuum pump -before the carbon canisters . i� Sterile poly <br /> tubing is used to attach a 1 liter tedlar bag, fitted with a 'E <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 and the appropriate label <br /> is placed on the tedlar. bag. ;; E <br /> Effluent Sample <br />{ A sample port for the effluent is located in the exhaust stack of <br /> ` the final canister. 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 is 'full, the valve is closed and locked, -the 't <br /> laced on the <br /> bag <br /> sample port closed, and the appropriate label is p ! <br /> i <br /> The labels for both the influent and effluent tedlarlibag samples <br /> show the date, time, sample TD## and analyses to be run. . <br /> Both the influent and effluent tedlar bag samples alre then placed <br /> within a cooler, on ice, and are hand delivered to WEGE' s J ' <br /> laboratory that same day. <br /> The vapor sample is then injected into an FID (Flame - Ionizing I( <br /> Detector) chromatograph and the resulting chromatogram compared <br /> to standard chromatograms of known TFH (Total Fuel ; Hydrocarbons, <br /> gasoline) and BTEX (benzene, toluene, ethlybenzene -and xylenes) <br />' concentrations . I' <br /> CO2 EMISSIONS ' 3 <br /> Analysis of the vapor stream has revealed that one'° of the major <br /> constituent of the extracted vapor is carbon dioxide " (CO2) . The <br /> CO2 is found in concentrations well above ` :;:its normal <br /> concentration in ' air ; (0 . 033996) and therefore is probably the <br /> lproduct of the oxidation of hydrocarbons by biolo <br /> gical and/or 'i 4 <br /> chemical means . <br /> page 3 of R604, 04/07/93 <br /> v <br />