Item A-MWMC Facilities Plan - Laserfiche WebLink

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3.0 Existing Wastewater Facilities 3.1 Wastewater Conveyance System The collection system that conveys wastewater to the WPCF includes the sewerage facilities that serve Eugene and Springfield. The two cities formerly maintained sewerage facilities independently, including collection and treatment. Beginning in 1984, all wastewater flows were treated at the newly upgraded regional treatment facility at the former Eugene treatment plant site. Springfield flows were conveyed to the regional treatment facility through the then newly constructed East Bank Interceptor (EBI) that follows the east bank of the Willamette River to the Willakenzie Pump Station just across the river from the WPCF. 3.1.1 Springfield Wastewater Collection System The Springfield collection system includes approximately 240 miles of pipeline. The major trunk systems in Springfield are Gateway, Thurston, Main Street, East Springfield Interceptor, South Springfield Interceptor, Central, and Downtown. The original downtown basin is the oldest portion of the Springfield collection system. Constructed before World War I, it was designed to carry and discharge both stormwater and sanitary flows to the Willamette River. In the 1950s, the City constructed a wastewater treatment plant. Wastewater flows remained in the existing conduits, but new conveyance facilities were built to transport stormwater to the Willamette River. The remainder of the system was developed around the downtown core as the city expanded. The original East Springfield interceptor was constructed in 1962 and the South Springfield Interceptor in 1997. The City of Springfield Sanitary Sewer Master Plan dated July 1980 contains additional information describing the Springfield portion of the collection system. 3.1.2 Eugene Wastewater Collection System The Eugene collection system includes approximately 770 miles of pipeline. Construction of Eugene's system began between 1900 and 1910. The original system was constructed to carry both stormwater and sanitary flows to the Willamette River. Around 1950, the first Eugene wastewater treatment plant was constructed; the plant provided primary treatment. After World War II, the Eugene system expanded rapidly to provide service to development in newly annexed areas. Expansion was also rapid in areas outside the City that were formerly served by septic systems. Additional major expansion occurred between 1960 and 1970, at which time the combined sewers in the older portion of the Eugene system were separated. The 1992 City of Eugene Public Works/Engineering Urban Sanitary Sewer Master Plan describes the City of Eugene portion of the collection system in more detail. MVVMC_3.0_REV11.DOC 3-I