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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 /> N` <br /> T 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 /> laboratory that same day. <br /> The vapor sample is then injected into a FID <br /> P P � (Flame Ionizing <br /> Detector ) chromatograph and the resulting chromatogram compared to <br /> standard chromatograms of known TFH (Total Fuel Hydrocarbons .- <br /> gasoline) <br /> ydrocarbons ,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 is 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 flaw rate is calculated by the pressure drop (millimeters <br /> water) across a square edge orifice plate. <br /> Ve = CK sqr (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 an 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 /> R604 vapor , 7/31./92, p. 6 <br />