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R603 UPDATE-11 11/19/92 • samples were obtained of the influent and effluent of the REMOX incinerator. Influent samples were obtained on January 20 , May 21, June 22, July 15, August 26, September 9 and September 11, 1992 . These samples were analyzed for TFH and BTEX along with screening for Tetrachloroethylene (PCE) , Trichloroethylene (TCE) and 1, 2,-Dichloroethane (DCE) using a Shimadzu GC-FID chromatograph mounted permanently in WEGE ' s portable laboratory. These compounds have the following retention times in the above chromatograph, DCE = 2 . 079 minutes, TCE = 3 . 023 minutes and PCE 3. 75 minutes. Prior to sampling the wells or the system, a calibrant prepared from fresh gasoline is infected into the GC- PID. The resulting chromatogram has numerous responses. The microprocessor of the GC-PID computes the area per response in volt seconds and assigns a peak # and retention time. The sum of all the responses are then used to obtain a mg/L per volt second calibrant factor, which is used to calculate mg/L as gasoline vapor from each analysis produced. Pounds per day can be computed using these mg/L values produced from the analysis of the different vapor recovery wells, the influent to the oxidizer, the pressure differential created at the orifice to determine flow rates for each well, and the influent to the oxidizer. The pounds • per day values for each well and the influent are averaged with the preceding site visit ' s pound per day value. This figure is then multiplied by the number of days the system operated between visits to estimate the total pounds each well and the system has removed for that time period. This poundage is added to the accumulated poundage of the previous visit to update the total pounds removed to date. The effluent sample is computed in the same fashion, but also includes natural gas flow along with the influent orifice flow rate . SAMPLING VAPOR STREAMS The vapor samples are obtained by attaching a dedicated air tight 60 cc syringe to a sample port on the vapor recovery manifold (on the well side of the orifice plate) with air tight f itted polytubing. The sample port is then opened and the syringe is purged by pulling and pushing the syringe plunger several times filling and depleting the syringe of that particular well ' s vapor stream. Then the syringe is filled, the sample valve is closed, and forceps are used to clamp onto the soft polytubing to create an air tight seal for the syringe before removing the syringe from the sample port. Once the 60 cc syringe is removed with the rl amparl pn7 y+i�hing atta�}:�d, the pluiger is pusaied into the syringe to create pressure within the syringe and released to allow the vapors that have been captured to reach equilibrium. A small dedicated needle attached to a dedicated 1 cc syringe is then inserted into the 60 cc syringe via the soft tubing for PAGE 6