Wastewater Treatment Facility Outfall and Diffuser Project

The State Water Resources Control Board (State Water Board) is funding the Project referred to internally as Wastewater Treatment Facility Outfall and Diffuser Project. The Project includes the following: • Modifications to the existing effluent pumps at the wastewater treatment facility (WWTF) to accommodate the new, longer outfall pipeline and a new surge control system to be located just south of the existing WWTF effluent pump station, • A bifurcation station and flow meter at the connection to the existing outfall pipeline to send and meter flows to the new outfall or to the disposal ponds, • Approximately two miles of new outfall pipeline, beginning at the bifurcation station and ending at the new diffuser, • A vacuum-assisted siphon priming system at the levee crossing, including vacuum primer building, priming valve vault, and primer trap structure, • Diffuser structure consisting of 250 linear feet of new 36-inch diameter welded steel pipe buried within the Feather River, with sixteen 12-inch diameter risers with ports extending above the riverbed, • An access ramp along the Feather River West Levee for use by the construction contractor and as a permanent access for the City, • New power connections to the bifurcation station and vacuum-assisted siphon building, and • Acquisition of easements to accommodate these project features on affected properties, as well as temporary construction easements. PROJECT NUMBER: 8682-110