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R603 UPDATE-12 12/22/92 3. 3 VAPOR RECOVERY VAPOR RECOVERY SYSTEM .AND MONITORING As stated in Update Status Report #5, monitoring wells MW1, MW2, MW3 , MW10 and the excavation 6 inch (EX-4) have been individually manifolded to a vapor extraction system with individual valved orifices for flow control sampling and vacuum and flow measurements from the individual wells . MW2 and MW3 are manifolded together with 2 inch tubing teed at the wells, but can be individually tested by placing a packer below the extraction tee of the well to seal that well from the vacuum system The individual wells are fitted with a PVC tee head with an air tight cap for well access The tee lateral (2 inch) is fitted with a 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 fatting where it enters the traffic box near MW2 and is teed to the 2 inch tubing from MW2 at that point MW1 is fatted 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 rases 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 lad of the tank Once the pipe reaches the roof of the store, it 90 degree elbows into SCH 40 UV protected PVL 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. TL LLQ -90-1 "I 4-'- � v-�AnIrl AlI=I u7cIIC1 f"�flT1f ens-- a�ion ranks are I-11C lllani.L. lu 4&- ii+u.iriuu...� •....��. -- ------ ----- 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 ICdU millimeters /tYm«LLl, Of wate1vYY1t-1 --e) oil Tht-,p 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 PAGE 5