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REG 603 UPDATE-9 9/14/92 n r 3 . 2 VAPOR RECOVERY: 51� VAPOR RECOVERY SYSTEM AND MONITORING 3 As stated in Update Status Report #5 , monitoring wells MW1 , MW2 , MW3 , MW10 and the excavation 6 inch (EX-411 ) have been individually manifolded to a vapor extraction system with individual valved orifices for flow control sampling and vacuum and flow t measurements from the individual wells . MW2 and MW3 are manifolded together with 2" tubing Tled at the wells , but can be ' individually tested by placing a packer below the extraction T of the well to seal that well from the vacuum system. The individual wells are fitted with a PVC "T" head with an air tight cap, for ,f well access . The "T" lateral ( 211 ) 1s fitted with a 1/4" pipe to �, � i� tubing fitting for obtaining vacuum/pressure and temperature lilt readings . Wells MW2 , and EX-4" are fitted with a pipe to hose 2" i�f fitting placed between the "T" and the 2" PVC flex hose that goes 1%f from the well to their individual condensate drop outs that hook j .j 11 into the extraction manifold. The 3" SCH 40 PVC lateral from MW3 'T ' is also fitted with a 2" pipe to hose fitting where it enters the „ ,� ! traffic box near MW2 and is T'ed to the 2" tubing from MW2 at that point. MW1 is fitted with a 2" PVC Y to allow access to the well I � off the straight leg of the Y and vapor recovery off of 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 2" PVC ; pipe at a slight incline towards the eastern fence of the Y � compound, 8 feet above the surface. At this point the PVC pipe ; drops into the condensate 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 condensate drop ?h out tank (Approximately 5 gallon capacity) prior to heading over the roof of the store with 2" galvanized pipe. The condensate tank 1s below ground xn a concrete lined traffic box. The condensate collected in this tank is removed weekly via an air tight valve attached to the top of the air tight lid of the tank. } �� I 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 i 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 � I orifice plate and a gate valve at the top of the riser . vacuum/pressure ports are located on either side of the orifice f 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 , combination of wells . All the extraction wells are manifolded together above the gate valve to a 4 inch orifice riser PAGE 5