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During the initial month of operation, three effluent samples <br /> were obtained during the day and analyzed using the 10S50 <br /> chromatograph. The highest value is used to calculate the VOC <br /> poundage per day produced. Presently, an influent and an <br /> effluent sample are obtained upon arrival to the site . <br /> Adjustments are then made to the vapor extraction system: removal <br /> of liquids from the condensation traps; closing the air dilute <br /> valve to maximize vapor removal, without causing the REMOX Unit <br /> to shut down due to high temperature shut off (greater than <br /> 17500F) , and closing the pump bypass to create maximum flow and <br /> vacuum from the wells Once, these adjustments have been <br /> completed and the system has stabilized, influent and effluent <br /> samples are again obtained, along with samples from the <br /> individual extraction orifices (wells) . The site is then secured <br /> until the next visit . <br /> FLOW RATES <br /> Flow gates are measured at the site by use of orifice plates . A <br /> one inch orifice is placed in line for each well and a three inch <br /> orifice is used to measure the total flow. An orifice plate <br /> restricts the flow of air across it This restriction causes a <br /> pressure drop across the orifice By measuring the resulting <br /> pressure change across the orifice it is possible to calculate <br /> the air flow rate The flow rate is calculated by the pressure <br /> drop (millimeters (mm) water) across a square edge orifice <br /> plate <br /> Ve = CK s qr(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 3n cubic feet per minute (CFM) <br /> A = Area orifice in square feet 1" = 0 . 00545 ft2 <br /> 3 " = 0 . 04909 ft2 <br /> Q = A X 0 . 65 X 794 . 6 X sgr(P) <br /> page 5 of R603, 03/22/95 <br />