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with a special septum "valve" and tubing bib, is placed within an air tight vacuum sample box (ATVSB) Sterile poly tubing is then used to attach the intake port of the ATVSB to the tedlar bag Sterile poly tubing is also used to attach the intake of the ATVSB to the sample port of the orifice plate . The exhaust port for the ATVSB is then attached to a vacuum pump which creates a vacuum inside the ATVSB allowing the tedlar bag to pull the sample from the valved manifold sample port without the danger of cross contamination, as could occur when using an in-line pump. Once the tedlar bag is filled, its valve is closed and locked and the appropriate label is placed on the tedlar bag EFFLUENT A sample port for the effluent is located at the exhaust of each carbon unit The flow pressure from the exhaust is great enough to fill a tedlar bag without the need of the ATVSB Sterile poly tubing is fitted to the exhaust port and the tedlar bag Then the sample valve of the tedlar bag is opened and the bag is filled with the sample Once the tedlar bag is full , the valve is closed and locked, the sample port closed, and the appropriate label is placed on the bag The labels for both the influent and effluent tedlar bag samples show the date, time, sample ID# and analyses to be run Both the influent and effluent tedlar bag samples were Chain of Custody hand delivered to WEGE' s laboratory that same day. WEGE' s laboratory analyzes the vapor samples by injection into an FID (Flame Ionizing Detector) chromatograph The resulting chromatogram is compared to standard chromatograms of known TFH (Total Fuel Hydrocarbons, gasoline) and BTEX (benzene, toluene, ethylbenzene, and xylenes) concentrations CO2 measurement is obtained with a Drager tube The standards are produced by infecting measured volumes of known density gasoline or BTEX compounds into tedlar bags filled with a measured amount of air, usually one 'Liter The gasoline standard is made by injecting 10 microliters (Al) of 0 . 75 mg/µl gasoline into one liter of air, the density was previously determined by weighing a know volume of gasoline The resulting concentration is 10 Al x 0 75 mg/µl / 11 = 7 5 mg/l The BTEX standard is made by injecting 5 ul of each compound into one liter of air, and using the following densities to calculate the concentration Benzene, 0 88 mg/µl , Toluene, 0 87 mg/Al , Ethylbenzene, 0 87 mg/µl , Xylenes, 0 87 mg/µl . The following are the resulting concentrations Benzene, 4 .4 mg/l ; Toluene:, 4 35 mg/1, Ethylbenzene, 4 . 35 mg/l; and Xylenes 4 35 mg/1 . FLOW RATES Flow rates are measured at the site using an orifice plate A one inch orifice-sampling manifold, is placed directly on the casing 5 R603 APPEND E