Laserfiche WebLink
ON SITE ANALYSIS <br /> Besides bag samples collected for the WEGE laboratory some samples <br /> may be run on site using a Photovac 1OS50 PTD chromatograph. <br /> The influent and effluent samples are collected from the same ports <br /> as the bag samples but 60 cc syringes are used to collect the sample <br /> and 0 5 cc of the vapor sample are then infected directly into the <br /> PTD chromatograph. The resulting chromatogram is then compared to <br /> a standard calibration run on the same chromatograph prior to the <br /> sample run <br /> • <br /> During the initial month of operation, three effluent samples were <br /> obtained during the day and analyzed using the lOS50 chromatograph. <br /> The highest value is used to calculate the VOC poundage per day <br /> produced Presently, an influent and an effluent sample are <br /> obtained upon arrival to the site Adjustments are then made to the <br /> vapor extraction system removal of liquids from the condensation <br /> traps, closing the air dilute valve to maximize vapor removal, <br /> without causing the REMOX Unit to shut <br /> down duethe hitemperature <br /> and <br /> shut off (greater than 1550oF) , g pump <br /> bypas to <br /> create maximum flow and vacuum from the wells . Once, these <br /> ad3ustments have been completed and the system has stabilized, <br /> influent and effluent samples are again obtained, along with samples <br /> from the individual extraction orifices (wells) . The site is then <br /> secured until the next visit . FLOW RATES <br /> Flow rates are measured at the site by use of orifice plates . A one <br /> 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 the <br /> air flow rate The flow rate is calculated by the pressure drop <br /> (millimeters (mm) water) across a square edge orifice plate . <br /> Ve = CK sgr (P) Q = AVe <br /> Where <br /> tre= reloc-1ty 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 /> 4544 ft2 <br /> J - v . .. i t n g _ _ <br /> Q = A X 0 65 X 794 6 X sqr (P) <br /> CALCULATIONS <br /> To calculate the pounds (lb) per day the concentration Is multiplied <br /> by the volume of air produced in one day <br /> page 3 of R603 , 12/28/92 <br />