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R603 UPDATE-13 2/15/93 1/4 inch pipe to tubing fitting for obtaining vacuum/pressure and temperature readings . Wells MW2, and EX-4 are fitted with a pipe to hose 2 inch fitting placed between the tee and the 2 inch PVC flex hose that goes from the well to their individual condensation dropouts The condensate dropouts are attached to the extraction manifold The 3 inch SCH 40 PVC lateral from MW3 is also fitted with a 2 inch pipe to hose fitting where it enters the traffic box near MW2 and is teed to the 2 inch tubing from MW2 at that point . MW1 is fitted with a 2 inch 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 then rises 7 feet into the air before a 90 degree elbow connects 2 inch PVC pipe at a slight incline towards the eastern fence of the compound, 8 feet above the surface . From here the PVC pipe drops into the condensation dropout for MW1, before 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 dropout (Approximately 5 gallon capacity) before heading over the roof of the store with 2 inch galvanized pipe The condensation dropout 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 dropout tank before the manifold At the manifold the individual wells' condensation tanks are connected to their own 2 inch PVC riser (36 inch 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 to read millimeters (mm) of water with red oil These manometers are connected 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 before a filter in front of the vacuum pump After the vapor stream 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 ..1-4-a —e,a �F ,^m t Iia :-wit- of the numn and effluent samples are VIJLJ.Attu ii.va.. ...... . .__.� �— — 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 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--4 " ) , see Tables 2, and 3 . On November 19 , December 9 and 18, 1992, "Tedlar" bag samples were obtained of the influent and effluent PAGE 5