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4-Dam Seep Return System <br /> Return Line Pressure Switch Description <br /> A pressure switch has been installed in the 4-Dam Seep Return Line to Robinson <br /> Reservoir. The in-line pressure switch is set to monitor line pressure following a 24 <br /> minute delay once pumping of seepwater is initiated. The delay allows for pressure <br /> equilibration as the line is filled. The equilibration point is set at approximately 140 psi. <br /> In the event that line pressure decreases below the equilibration point, the pressure <br /> switch operates to cease pump operation. A relay has been installed to lock-out the <br /> pumps and signal an alarm at the 3-Mill control room. The relay lock-out requires that <br /> pumps be reset manually. Pump shutdown allows drainage of the line into the primary <br /> seep collection pond. <br /> The alarm will also signal in the event of a power failure or high water level in the <br /> secondary seep collection pond. The alarm at the 3-Mill control room initiates a system <br /> check or system reset by the Water Plant Operators on duty. <br />