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0 <br /> During the initial start-up, the flow rate will be vaned A series of vacuum readings, at <br /> increasing flow rates, will be recorded to determine optimum vacuum, air dilution, and <br /> flow rate <br /> MEASUREMENT AND CALCULATION OF VE FLOW RATES <br /> The influent airflow rates for the VE system will be measured by the use of an orifice <br /> plate, which restricts the flow of air across it This restriction causes a pressure drop <br /> across the orifice By measuring the resulting pressure change across the orifice it is <br /> possible to calculate the airflow rate The pressure drop (millimeters (mm) water) is used <br /> to calculate the flow rate 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 I" = 0 00545 ft2 <br /> Q = AX065X7946XSquare Root (P) <br /> COLLECTION AND ANALYSIS OF VAPOR SAMPLES <br /> Influent samples will be obtained from sample ports located in the manifold that connects <br /> the underground VE piping to the Rotron Blower Effluent vapor samples will be <br /> collected from sample ports located in the connections between the four carbon canisters <br /> and the exhaust stack that exists the fourth canister The labels for both the influent and <br /> effluent tedlar bag samples will show the date, time, sample ID# and analyses to be run <br /> The influent and effluent samples we be delivered with chain of custody documentation <br /> to a certified laboratory and analyzed for concentrations of TPH-G, BTEX, and MTBE <br /> using EPA methods 8015M and 8020 CO2 analysis will be performed onsite using a <br /> Drager Tube assembly <br /> SCHEDULE OF VAPOR SAMPLE COLLECTION <br /> Influent and effluent vapor samples will be collected from the VE system for certified <br /> laboratory analyses on the following schedule <br /> First Day - 3 vapor samples <br /> Second day - I vapor sample <br /> Third Day - I vapor sample <br /> Fifth Day- i vapor sample <br /> 11 <br />