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Both the influent and effluent tedlar ba samples are then lace <br /> within a cooler, on ice, and are hand delivered to placed <br /> laboratory that same day. <br /> The vapor sample is 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 . <br /> CO2 EMISSIONS <br /> Analysis of the vapor stream has revealed that one of the ma3or <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 0330) 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 ( 75-1%) , 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 (C) 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/1b= 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/1 = 0 79cf/male <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 10i = 1/100 of a mole <br /> 0411b/cf/100.= 00041 lb/cf/, <br /> I <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 . 03% CO2, <br /> normal air contains 0 0330 CO2, the 0 997%s 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 . 9970-. x 0 00041lb/cfm/o x 1440min/day = 37 . O1b/day <br /> page 3 of R604, 10/21/93 <br />