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REG 603 UPDATE-6 2/21/92 collected in this tank is removed weekly via an air tight valve attached to the top of the air tight lid of the tank. Once the pipe reaches the roof of the store, it 90 degree elbows into SCH 40 UV protected PVC pipe and heads across the roof towards the treatment compound where it 90 degree elbows down the wall into a second Condensate drop out tank prior to the manifold. At the manifold the individual wells condensate tanks are connected to their own 2" PVC riser ( 36" in height) with an orifice plate and a gate valve at the top of the riser. Vacuum/pressure ports are located on either side of the orifice plate. Each orifice (well) has its own monometer (calibrated in millimeters (mm) oil) which are hooked to the ports for continuous measurement of flow from a particular well or in the case of MW2 and MW3 combination of wells. All the extraction wells are manifolded together above the gate valve to a 4 inch orifice riser prior a filter in front of the vacuum pump. After the vapor stream leaves the vacuum pump, it is pushed into the thermal oxidizer (RXL 400 ) which oxidizes the gasoline range hydrocarbon vapors at no less than 1400OF and no greater than 1550 F. 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 Figure 7 and UPDATE STATUS REPORT #5 . A portable ambient air PID-GC (Photovac 10550 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-411 ) , see Tables 2, 3 and 4. On October 22, and 24, 1991, "Tedlar" bag samples were obtained of the influent and effluent of the REMOX incenerator and on January 20, 1992, a influent sample was obtained. These samples were analyzed for TFH and BTEX along with screening for Tetrachloroethylene (PCE) , Trichloroethylene (TCE) and 1,2,-Di.chloroethane (DCE)using a Shimadzu GC-FID chromatograph mounr-ed permanenLiy in WEGE - s portable laboratory. These compounes 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 in3ected into the GC- PTn_ The r'Rc111t I n g nhromatn gram 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. Using these mg/L values produced from the anlaysis of the different vapor recovery wells and the influent to the oxidizer, and the pressure differential created at the orifice to determine flow rates for each well and the influent to the oxidizer; pounds per day can be computed. The pounds per day values for each well and the PAGE 8