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2020 Eugene Wastewater Master Plan Chapter 3: Existing Wastewater Systems 9 expand the model to include 8-inch diameter pipes, starting in areas where the focus is to reduce Infiltration/Inflow. In 2004 a comprehensive update to the 1977 regional wastewater treatment plan was completed. The 2004 plan included an evaluation of the regional wastewater treatment facilities, including Eugene- Springfield Water Pollution Control Facility (E-S WPCF), major pump stations and interceptors, the Biosolids Management Facility, the Biocycle Farm, and the Seasonal Industrial Waste Facility. The intent of this MWMC Facilities Plan was to identify facility enhancements and expansions necessary to serve the community’s wastewater needs through 2025. The plan identified improvements necessary to increase the capacity from 175 MGD to 277 MGD to serve a 2025 MWMC metro population of 297,585. Some of the improvements of the 13-phase, $144 million project included significant upgrades to the existing facilities and installation of new pretreatment grit removal, digesters, additional clarifiers and a new tertiary filtration system and high-rate disinfection facilities. By 2016, the majority of regional capital projects identified in the 2004 MWMC Facilities Plan and the 2014 MWMC Partial Facilities Plan Update dealing with wastewater capacity and treatment needs through 2025 had been completed. In 2017, the City simplified the jurisdictional boundary of private versus public wastewater systems. Prior to that time, the portion of the service lateral to a business or residence was public within the right of way if it was built with the mainline and considered private if it was built after the mainline. This distinction was difficult to track for both the City and the public. Effective 2017 the City has taken ownership and maintenance responsibilities for all wastewater lines within the public rights of way, which includes more than 60,000 lateral lines. MAJOR BASINS The 1992 USSMP divided the Eugene service area into 14 major basins (Map 3-A shows the basins and major system components) and 144 sub-basins, shown in basin flow diagrams (see Map 3-B West and Map 3-C East). Several of the major basins have a common outfall and similar characteristics and, therefore, are grouped together for the purpose of this plan. The seven groups are: • Highway 99 Industrial area, including the Airport • River Road/Santa Clara • Willakenzie • Bethel • South West • Downtown • Laurel Hill Each group of major basins is described as follows: Highway 99 Industrial Area, including the Airport (SI & AI) The Highway 99 Industrial Area (see Map 3-D) is the area between State Highway 99 and Northwest Expressway and includes seven sub-basins. There are currently 8 miles of wastewater lines in this basin, all of which have been constructed since 1985.