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R603 UPDATE-11 11/19/92 fitting placed between the "T" and the 2" PVC flex hose that goes from the well to their individual condensation drop outs that hook into the extraction manifold. The 3" SCH 40 PVC lateral from MW3 is also fitted with a 2" pipe to hose fitting where it enters the traffic box near MW2 and is Tled to the 2" tubing from MW2 at that point. MW1 is fitted with a 2" PVC Y to allow access to the well from the straight leg of the Y and vapor recovery from the angled leg of the Y. The vacuum recovery piping from this point rises 7 feet into the air prior to an 90 degree elbow connecting 21' PVC pipe at a slight incline towards the eastern fence of the compound, 8 feet above the surface. At this point the PVC pipe drops into the condensation drop out tank for MW1, prior to the vacuum extraction manifold. MW10 is manifolded to the treatment compound via SCH 40 PVC pipe underground west towards the store. Once the pipe reaches the store it connects into a condensation drop out tank (Approximately 5 gallon capacity) prior to heading over the roof of the store with 2" galvanized pipe. The condensation tank is below ground in a concrete lined traffic box. The condensation 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. There it 90 degree elbows down the wall into a second condensation drop out tank prior to the manifold. At the manifold the individual wells ' condensation 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 manometer ( 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 , commination of wells . All the extraction wells are manifolded together above the gate valve to a 4 inch orifice riser prior to 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 14000F and no greater than 1550011F. 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 1OS50 packed column) is used at the site to sample the influent and effluent of the REMOX . oxidizer and the individual wells (Mwl, MW2-3 , MW10 and EX-411 ) , see Tables 2 , and 3 . On October 22 , and 24, 1991, "Tedlar" bag PAGE 5