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R603 UPDATE-12 12/22/92 filter in front of the vacuum pump. After the vapor stream j leaves the vacuum pump, it is pushed into the thermal oxidizer which oxidize the gasoline range hydrocarbon vapors at no less than 1400OF and no greater than 15500F. Influent samples are obtained from the exit of the pump and effluent samples are obtained from the stack of the thermal oxidizer. The gasoline range hydrocarbons are oxidized into heat, CO2 and water vapor, see UPDATE STATUS REPORT #5 A portable ambient air PID-GC (Photovac 10S50 packed column) is used at the site to sample the influent and effluent of the REMOX oxidizer and the individual wells (MW1, MW2-3 , MW10 and EX-4" ) , see Tables 2 , and 3 On November 19 , December 9 and 18 , 1992 , "Tedlar" bag samples were obtained of the influent and effluent of the REMOX incinerator and analyzed in WEGE' s portable laboratory utilizing the Photovac 10s50 PID-GC and Shimadzu FID- GC Just an influent sample was obtained on December 7, 1992 and influent from individual wells were obtained on December 9, 1992 These samples were analyzed for TFH and BTEX along with screening for Tetrachloroethylene (PCE) , Trichloroethylene (TCE) and 1, 2, -Dichloroethane (DCE) using a Shzmadzu 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 Before sampling the wells or the system, a calabrant made from fresh gasoline is injected into the GC-PID and GC-FID The resulting chromatograms has numerous responses The microprocessor of the GC-PID and GC-FID computes the area per response in volt seconds and assigns a peak number 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 hours the system operated between visits, to estimate the total pounds each well and the system has removed for that time period. This figure is added to the accumulated poundage of the previous visit to update the total pounds removed 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 010 ..`l port L.�. v rti r m r i n ra (-T9 OU cc syringe t o a sample port on C-he vapor rccover' - .....feN1.A (in__ the well side of the orifice plate) with air tight fitted polytubing. The sample port is opened and the syringe purged by pulling and pushing the syringe plunger several times Filling and depleting the syringe of that particular well' s vapor stream PAGE 6