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2020 Eugene Wastewater Master Plan Chapter 1: Introduction and Summary 1 Chapter 1: Introduction and Summary MASTER PLAN PURPOSE The Wastewater Master Plan (master plan) was initiated by the City Engineer to organize a wide variety of information about the City of Eugene wastewater collection system and to update the 1992 Urban Sanitary Sewer Master Plan (USSMP). The plan’s scope includes all public portions of the collection system owned and maintained by the City of Eugene, including pump stations. It excludes facilities owned by the Metropolitan Wastewater Management Commission as well as facilities on private property. The planning period for this document is 20 years. The purpose of the master plan is to: • Provide historical information about the development of the existing system. • Identify general problems and rehabilitation needs of the existing system. • Provide design criteria to be used for future system expansion. • Identify future needs and estimated costs to extend major system improvements to unserved areas within the urban growth boundary. The master plan is intended to be useful to several groups: • City staff, to ensure consistency in various wastewater-related analyses; • Policy makers, to provide background and guidance in the consideration of wastewater-related plans and policies; and • Developers and other private interests, to aid them in their understanding of the various requirements related to the expansion and preservation of Eugene’s wastewater system. Through the efforts outlined in this master plan, the City will continue to build and maintain a wastewater collection system that meets several key objectives: • Protect the public health and our local water resources • Meet the NPDES permit requirement by eliminating sanitary sewer overflows • Build new improvements with an expected life of more than 100 years • Size improvements to ensure upstream future developments have capacity • Ensure improvements are water-tight and reduce infiltration and inflow • Minimize risk and increase seismic resiliency GENERAL Carefully planned, well-engineered, regularly maintained wastewater collection and treatment systems protect public health and support economic growth. For thousands of years, water has been the primary vehicle for conducting away community wastes. The collection and disposal of sewage has evolved over the past several centuries to include elaborate underground piped networks and complex treatment facilities. The basic layout for a modern wastewater collection system includes small-diameter, shallow pipes that connect homes and businesses to the public system. These lateral pipes connect to larger, deeper pipes that typically run under roadways and ultimately discharge to a treatment plant. As detailed in Chapter 3, wastewater system construction began in central Eugene between 1900 and 1910. The wastewater collection system expanded very slowly prior to 1945. The initial system was a combined system that collected both stormwater and wastewater flows.