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ON SITE ANALYSIS <br />.i In addition to the bag samples collected for the WEGE laboratory <br /> samples may be run on site using a Photovac 10S50 PID <br /> chromatograph. <br /> The influent and effluent samples are collected from the same <br /> ports as the bag samples but 60 cc syringes are used to collect <br /> the sample and 0 . 5 cc of the vapor sample are then infected <br /> directly into the PSD chromatograph. The resulting chromatogram <br /> as then compared to a standard calibration run on the same <br /> chromatograph prior to the sample run. <br /> During the initial month of operation, three effluent samples were <br /> obtained during the day and analyzed using the 10550 <br /> chromatograph. The highest value is used to calculate the VOC <br /> poundage per day produced. Presently, an influent and an effluent <br /> sample are obtained upon arrival to the site. Adjustments are <br /> then made to the vapor extraction system: removal of liquids from <br /> the condensation traps ; closing the air dilute valve to maximize <br /> vapor removal , without causing the REMOX Unit to shut down due to <br /> high temperature shut off (greater than 1550-F) ; and closing the <br /> pump bypass to create maximum flow and vacuum from the wells . <br /> Once, these adjustments have been completed and the system has <br /> stabilized, influent and effluent samples are again obtained, <br /> along with samples form the individual extraction orifices <br /> (wells ) . The site is then secured until the next visit. <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 a three <br /> inch orifice is 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. ( see Appendix A , orifice <br /> Flow Calculation) <br /> The orifice plates used to determine the flow rate are the square <br /> edged type C-0 .65 . <br /> WEGE has developed a table for calculating the flow across an <br /> orifice of known size. ( see Appendix A, Flow Rate Table) . <br /> i <br /> CALCULATIONS <br /> To calculate the pounds (lb) per day the concentration is <br /> multiplied by the volume of air produced in one day. <br /> I� <br /> I <br /> I <br /> 5 <br />