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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 is then injected 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 <br /> CO2 EMISSIONS <br /> Analysis of the vapor stream has revealed that one of the ma)or <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 . 033%) and therefore is probably the <br /> product of the oxidation of hydrocarbons by biological and/or <br /> chemical means <br /> Because of the elevated concentrations of CO2 found in the <br /> influent ( . 75-11k) , this CO2 represents a significant amount of <br /> hydrocarbon removed. On average in a hydrocarbon molecule there <br /> are 2 Hydrogens (H) for every Carbon (G) therefore each CO2 <br /> represents the oxidation of one CH2 radical . This indicates that <br /> for ever mole of CO2 recovered one mole of CH2 has been <br /> destroyed. The molecular weight of CH2 is 14 gm/mole . <br /> 14gm/435 . 6gm/lb= 0 . 032 lb/mole. <br /> The volume of one mole of gas at STP = 22 4 1 <br /> 1 1 = 0353 cf 22 41 x . 0353 cf/l = 0 79cf/mole. <br /> Therefore one cf of pure CO2 represents <br /> 0 032 lb/mole / 0 . 79 cf/mole = . 041 lb/cf of CH2 <br /> In gasses 11; = 1/100 of a mole . <br /> 0411b/cf/100%= 00041 lb/cf/% <br /> A sample of the total flow from the vapor extraction system on <br /> 10/06/93 was analyzed for CO2 . The sample contained 1 . 030 CO2, <br /> normal air contains 0 . 0331r CO2, the 0 . 997% in the sample is most <br /> probably the result of oxidation of the hydrocarbons either <br /> chemical or biological At the current rate of vapor extraction, <br /> 62 . 92 cfm it can be calculated that we are currently removing <br /> 37 0 pounds of hydrocarbon from the site per day as the result <br /> of biological or chemical degradation. <br /> 62 . 92cfm x 0 . 997% x 0 . 000411b/cfm/o x 1440min/day = 37 . 01b/day <br /> page 3 of 8504, 10/21/93 <br />