Century is preparing design and Contract Documents to provide a 225 g.p.m. leachate pumping station with approximately 2,500 linear feet of 6-inch diameter HDPE double wall force main which will tie-into an existing 6-inch force main in Dave’s Cove Road and discharge into a public sanitary sewer manhole at U.S. 40.  The pumping station design is a suction lift station with above ground pumps installed over the wet well.  Design components include:

• Installing two 20,000 gallon double walled underground storage tanks for the storage of leachate.
• Approximately 2,000 linear feet of gravity sewer to transmit sewage flows from the Administrative and Maintenance Building
  area down to the leachate pumping station. 
• Eliminating the existing 2,500,000 gallon leachate lagoon, removing the liner, and reclaiming the land by filling to grade for use by the Bureau of Solid Waste.

• The pumping station enclosure and wet well are classified as a Class I Hazardous Area.  To avoid the expense of explosion proof controls and switches, the motor control center (MCC), electrical and alarm panels, automatic transfer switch, and emergency generator will be housed separately in a
  pre-cast concrete building away from the pumping station area.
• Methane gas can not be allowed to migrate into the holding tanks and wet well, and an in-line trap on the leachate gravity drain piping will be used to keep the methane gas within the landfill area.
• The force main hydraulics and hydraulic gradient is complex due to other force mains that manifold into the main 6-inch force main, requiring coordination of flows and dynamic head with others.