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GES <br /> GENESIS ENGINEERING&REDEVELOPMENT <br /> 2.2.2 Piping Between Extraction Wells and the Blending Tank <br /> The 2 inch diameter discharge pipe from each well will connect to a single 4 inch diameter <br /> pipe that flows into the blending tank. Between the well head and 4 inch diameter pipe, the 2 <br /> inch diameter discharge pipe will be fitted with(Figure 9): <br /> • A pressure gauge; <br /> • A sampling port; <br /> • A backflow prevention valve; <br /> • A balancing valve to regulate the flow rate; <br /> • A flow meter; and <br /> • A ball valve to isolate/connect the individual well to the rest of the system. <br /> 2.2.3 Blending Tank <br /> Groundwater extracted from each well will enter a 5,000 gallon tank to blend the water to <br /> meet the nitrate and TDS discharge limits into the NPWS. The 4 inch diameter influent pipe <br /> carrying groundwater from all wells will inlet near the top of the tank, and water will exit <br /> through the bottom of the tank via a 4 inch diameter effluent pipe leading to the NPWS. <br /> Assuming that the influent and effluent rates are the same (i.e. 80 gpm) and that 4,000 <br /> gallons of water will be in the tank at any one time, the residence time in the tank is 50 <br /> minutes. <br /> The blending tank will also be equipped with a high level switch that will temporarily turn <br /> off the pumps in the extraction wells to keep the tank from overflowing. The tank will also <br /> be equipped with a low level switch to temporarily stop flow to the NPWS to ensure air does <br /> not enter the NPWS. <br /> 2.2.4 Connection to NPWS System <br /> Water will be transferred from the blending tank to the NPWS by a 4 inch diameter pipe. A <br /> centrifugal pump capable of flow rates up to 300 gpm will be used to transfer water from the <br /> tank to the NPWS. The transfer pump will be controlled by a low level switch in the tank <br /> that will shut off the pump. A pressure switch will be installed between the transfer pump <br /> and the NPWS to shut off the pump if the pressure in the NPWS system exceeds 60 psi. <br /> The 4 inch diameter discharge pipe will also be equipped with: <br /> • A sampling port; <br /> • A backflow prevention valve; <br /> R.F.Land Inc. 6 of 11 <br /> Groundwater Extraction Work Plan <br /> October 2014 <br />