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i -� Effluent Sample � A sample port for the effluent is located in the exhaust stack of t the Remox system. The flow pressure from the exhaust is great enough to fill a tedlar bag. Sterile poly tubing is fitted to the exhaust port and the tedlar bag. Then the sample valve of the tedlar bag is opened and the bag is filled with the sample. Once the tedlar bag is full, the valve is closed and locked, the sample # port closed, and the appropriate label is placed on the bag. The labels for both the influent and effluent tedlar bag samples show the date time sample p e ID# and analyses to be run. Both the influent and effluent tedlar bag samples are then placed within a cooler, on ice, and are hand delivered to WEGE' s laboratory that same day. i f The vapor sample is then injected into an FID (Flame Ionizing Detector) chromatograph and the resulting chromatogram compared to . t standard chromatograms of known TFH (Total Fuel Hydrocarbons, gasoline) and BTEX (benzene, toluene, ethylbenzene, and xylenes) ' concentrations . A duel chromatograph comparison is also ran ' (Photovac 1OS50) to evaluate BTEX, TCE, PCE, and DCE. I ON SITE ANALYSIS Besides bag samples collected for the WEGE laboratory some samples may be run on site using a Photovac 10550 PID chromatograph. f The influent and effluent samples are collected from the same ports as the bag samples but 60 cc syringes are used to collect the sample and 0 . 5 cc of the vapor sample are then injected directly into the PID chromatograph. The resulting chromatogram is then compared to a r standard run on the same chromatograph prior to the sample run. During the initial month' of operation, three effluent samples were obtained during the day and analyzed using the lOS50 chromatograph. { j The highest value is used to calculate the VOC poundage per day produced. Presently, an influent and an effluent sample are obtained upon arrival to the site . Adjustments are then made to the vapor extraction system: removal of liquids from the condensation traps; closing the air dilute valve to maximize vapor removal, without causing the REMOX Unit to shut down due to high temperature shut off (greater than 17500F) ; and closing the pump bypass to create maximum flow and vacuum from the wells . Once, these adjustments have been completed and the system has stabilized, influent and effluent samples are again obtained, along with samples from the individual extraction orifices (wells) . The site is then secured until the next visit . �4 k page 3 of R603, 12/16/93