5.8. SR 12-20-2004 - Laserfiche WebLink

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PRETREATMENTPIPE REROUTING Several pipes are routed to the existing grit basin and will need to be rerouted to the proposed tame Construction sequencing will be analyzed further during final design. Grit Waste Pipe A 6-inch sludge pipe ITom the grit tank draws grit ITom the tank to the grit pumps. This 6-inch pipe needs to be rer=ted to the new grit tank. The sludge line would be routed and reduced as needed to match up with the grit tank as specified by the manufacturer. Grit Classifier Overflow Pipe I Floor Drain Overflow ITom the grit cyclone and grit washer flows through a 6-inch pipe into the existing grit tank. The pipe is to be rerouted to direct flow into the new grit system. Overflow ITom the grit washer would flow into the channel leading to the grit tank. Currently, flow ITom the grit classifier underdrain and the upper level floor drain are routed to the sump pump. Both of these pipes are to be rerouted into the overflow line to teed directly into the grit channel. The overflow line needs to be lowered to meet the underdrain and floor drain pipes, and to increase ground cover over the pipe. Sludge Waste Pipe A 4-inch sludge pipe ITom the control building currently flows into the grit tank. The sludge pipe directs waste sludge from the biological systems into the grit tank and consequently, primary clarifiers. The sludge pipe needs to be rerouted into the new grit system Sludge would flow through the line into the grit tank approach channel. Digester Overflow Pipe A 4-inch overflow pipe ITom the digesters feeds into the grit tank. Digester supernatant flows to the grit tank through this pipe. This pipe needs to be rerouted into the new grit system Plant Water Pipe A 4-inch pipe accommodates flow ITom a lift station, which pumps wastewater ITom the plant into the existing grit tank. Wastewater and drain water generated by the plant flow into this lift station. This pipe also needs to be rerouted into the new grit system 9