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COLLECTING SAMPLES Influent Sample The influent sample was obtained from a sample port located, prior to the system vacuum pumps and before the Carbon Units . A 1 liter tedlar bag, fitted with a special septum "valve" and tubing bib, is placed within an air tight vacuum sample box (ATVSB) Sterile poly tubing is then used to attach the intake port of the ATVSB to the tedlar bag Sterile poly tubing is also used to attach the intake of the ATVSB to the sample port of the valved manifold. The exhaust port for the ATVSB is then attached to a vacuum pump which creates a vacuum inside the ATVSB allowing the tedlar bag to pull the sample from the valved manifold sample port without the danger of cross contamination, as could occur when using an in-line pump Once the tedlar bag is filled, its valve is closed and locked and the appropriate label is placed on the tedlar bag. Effluent Sample A sample port for the effluent is located in the exhaust stack of the Carbon Units 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 ID## and analyses to be run Both the influent and effluent tedlar bag samples are then placed within a cooler, and are hand delivered to WEGE' s laboratory that same day The WEGE laboratory then CofC' s the samples to a second lab if confrimation if felt necessary The vapor sample is then inkected into an FID (Flaine ionizing Detector) chromatograph and the resulting chromatogram compared to standard chromatograms of known TFH (Total Fuel Hydrocarbons, gasoline) and BTEX (benzene, toluene, ethylbenzene, and xylenes) concentrations A second column chromatograph comparison was __ int,r, v— c 1nS5n1 to --aluate BTEX TCE, PCE, and DCE Q1�7V 11„1,11 LL l3V 4va.� FLOW RATES riow rates are measured at tine site by using orifice plates . A one inch orifice is placed in line for each well and a three inch orifice is used to measure the total flow An orifice plate restricts the flow of air across it This restriction causes a pressure drop across the orifice By measuring the resulting 4 Regal 603 AIR RPT. 3/08/96