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EFFLUENT 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 pcly 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 E laboratory that same day. The vapor sample is then injected into a FID (Flame Ionizing i 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 . FLOW RATES i Flow rates are measured at the site by use of orifice plates . i A one inch orifice is placed in line for each well and two one inch or.-faces in parallel are used to measure the total flow . An orifice plate restricts the flow of air across it. This restriction causes a pressure drop across the orifice. By i measuring the resulting pressure change across the orifice it is possible to calculate the air flow rate. The flow rate is calculated by the pressure drop (millimeters (mm) water) across a square edge orifice plate. Ve = CK sgr ( P) Q = AVe Where : Ve= velocity in feet per minute ( fpm) C = Orifice Coefficient = 0 . 65 ( for orifice used) K = Constant = 794 . 6 mm water P = Pressure differential across the orifice Q = Flow rate in cubic feet per minute (CFM) A = Area orifice in square feet . 1" = 0 . 00545 ft2 Q = A X 0 . 65 X 794 . 6 X sgr( P) • R604 vapor , 7/31/92 , p. 6