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Corrective Action Plan Page 34 Carbon Adsorption Unit Plumbing. After passing through the air stripper, the treated water is transferred to the carbon adsorption units (GAC-1) [Note a bypass line is provided so that water can be pumped directly from the surge-tank (ST-1) to the carbon adsorption units without passing through the air-stripper if that mode of operation should be required ] The rate of water flow into the GAC units is monitored by a pulse-type, flow meter (FI-1) The plumbing for the carbon adsorption units is arranged such that they are connected in series and a piping manifold with 8 valves (V-1) can be set so that the relative upstream and downstream order of the vessels can be reversed Pressure gauges (PI-1) are located in the inlet and outlet lines of each vessel so that the pressure drops across each unit and across the combined two-vessel array can be monitored An injection port (VAI-1) is provided in the influent line to the GAC assembly for administration of algaecides if such should be required to control biological fouling of the carbon units Sampling ports (VSP-1) provide for recovery of specimens of the influent to the carbon adsorption system, recovery of specimens of water that has passed through the first of the senes-connected vessels (i a at the "mid-point") and for recovery specimens of the final effluent from the groundwater treatment system where it flows out of the downstream vessel before it is discharged to the storm-sewer Exhausted carbon is removed and the vessels recharged with fresh carbon through ports in the top Drain valves (V-6) at the bottom of each unit permits the carbon vessels to be fully emptied of water before they are disassembled for maintenance The accumulated total volume of water treated by the groundwater treatment system is recorded by an integrating flow totalizer (FT-1) situated in the effluent line from the carbon adsorption unit array where it enters the underground pipe that carnes the clean water to the storm sewer Pipe Unions 1 The principal valves (V-1, V-2 and V-3) in the groundwater treatment system plumbing have true-union, or flanged, couplings and these are supplemented by additional true- union, straight couplings (PC-1 and PC-2) that permit the pipelines and manifolds to be readily assembled and disassembled for ease of construction and maintenance The locations of these supplemental, true-union couplings are shown schematically on Figure 11 [Note The actual number and locations of true union couplings may vary from those shown and will be determined in the field based on final pipe routings and the layout of system appurtenances ]