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COLLECTING LABORATORY SAMPLES Influent Sample The influent sample is obtained from a sample port located after the system vacuum pump before the carbon canisters . Sterile poly tubing is used to attach a 1 liter tedlar bag, fitted with a special septum valve and tubing bib, to the sample port . The sample port is on the pressure side of the pump and therefore the bag will fill without need of a pump. Once the tedlar bag is filled, its valve is closed and locked and the appropriate label is placed on the tedlar bag. Effluent Sample A sample port for the effluent is located in the exhaust stack of the final canister. The flow pressure from the exhaust is great enough to fill a tedlar bag. 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 are then placed within a cooler, on ice, and are hand delivered to WEGE' s laboratory that same day. The vapor sample is then injected into an FID (Flame Ionizing Detector) chromatograph and the resulting chromatogram compared to standard chromatograms of known TFH (Total Fuel Hydrocarbons, gasoline) and BTEX (benzene, toluene, ethlybenzene, and xylenes) concentrations . CO2 EMISSIONS Analysis of the vapor stream has revealed that one of the major constituent of the extracted vapor is carbon dioxide (CO2) . The CO2 is found in concentrations well above its normal concentration in air (0 . 033'x) and therefore is probably the product of the oxidation of hydrocarbons by biological and/or chemical means . page 3 of R604, 04/30/93