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EFFLUENT <br /> A sample port for the effluent is located in the exhaust stack of <br /> the final canister . The flow pressure from the exhaust is great <br /> enough to fill a tedlar bag. Sterile poly tubing is fitted to the <br /> exhaust port and the tedlar bag. Then the sample valve of the <br /> tedlar bag is opened and the bag is filled with the sample. Once <br /> the tedlar bag is full , the valve is closed and locked, the sample <br /> port closed, and the appropriate label is placed on the bag. <br /> The labels for both the influent and effluent tedlar bag samples <br /> show the date, time, sample ID# and analyses to be run. <br /> 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 /> I laboratory that same day. <br /> The vapor sample is then in]ected into a FID (Flame Ionizing <br /> Detector) chromatograph and the resulting chromatogram compared to <br /> standard chromatograms of known TFH (Total Fuel Hydrocarbons , <br /> gasoline) and BTEX (benzene, toluene, ethlybenzene, and xylenes ) <br /> concentrations . <br /> FLOW RATES <br /> Flow rates are measured at the site by use of orifice plates . <br /> A one inch orifice as placed in line for each well and two one <br /> inch orifices in parallel are used to measure the total flow . <br /> An orifice plate restricts the flow of air across it. This <br /> restriction causes a pressure drop across the orifice. By <br /> measuring the resulting pressure change across the orifice it is <br /> possible to calculate the air flow rate. <br /> The flow rate is calculated by the pressure drop (millimeters (mm) <br /> water ) across a square edge orifice plate . <br /> Ve = CK sgr(P) Q = AVe <br /> Where: <br /> Ve= velocity in feet per minute ( fpm) <br /> C = Orifice Coefficient = 0 . 65 ( for orifice used) <br /> K = Constant = 794 . 6 mm water <br /> P = Pressure differential across the orifice <br /> Q = Flow rate in cubic feet per minute (CFM) <br /> A = Area orifice in square feet. 1" = 0 .00545 ft2 <br /> Q = A X 0 . 65 X 794 . 6 X sgr(P) <br /> I <br /> I <br /> I <br /> I <br /> i <br /> f <br /> l <br /> ' R604 vapor, 6/19/92 , p. 5 <br /> i <br />