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<br />City of Everett • 2024 Comprehensive Sewer Plan • October 2025 <br />Executive Summary • ES-9 <br />Chapter 5 also discusses future flow rates, industrial flows, and flow contributions from adjacent sewer <br />systems. <br />Existing Collection and Conveyance Sewer System <br />The City owns and operates a collection and conveyance system that consists of a network of gravity mains, <br />force mains, interceptors, regulators, and lift stations that convey wastewater to the WPCF. The collection <br />and conveyance system is shown in Figure ES-3. <br />The City’s combined system, carrying both stormwater and wastewater, is in the north part of the City and <br />serves approximately 6,400 acres. There are approximately 619,000 feet of gravity mains and 80,600 feet <br />of force mains in the combined system. The combined system contains eleven main interceptors: 17th <br />Street Interceptor, Broadway Trunk, Hoyt Trunk, Memorial Stadium Interceptor, Snohomish River CSO <br />Interceptor, Summit Avenue Interceptor and Summit Tunnel, Trunk A, Trunk B, and 37th Street Trunk. <br />The City’s separated system, conveying only wastewater, is in the south part of the City and covers <br />approximately 24,400 acres which includes areas in AWWD, SLWSD, and MWWD. There is approximately <br />1,013,000 feet of gravity mains and 94,000 feet of force mains in the separated system. The separated <br />system contains four main interceptors: Central Interceptor, Mukilteo Beach Interceptor, South End <br />Interceptor (South), and South End Interceptor (North). <br />The City currently maintains and operates 35 active lift stations in its service area and three abandoned <br />stations. The lift stations have firm capacities ranging from 120 to 12,600 gallons per minute (gpm). <br />There are currently 32 regulators. Many of them were installed in the 1960s and 1990s; five have been <br />installed since 2008. There are eight types of hydraulic configurations to divert wet weather flows: weir, <br />leaping weir, overflow pipe, dam, slide gate, motor operated slide gate, weir gate, and Cipoletti weir. <br />The City has 13 active CSO outfalls; six discharge to the Snohomish River and seven discharges to Port <br />Gardner Bay in Puget Sound.