Resolution 8245 - Laserfiche WebLink

City of Everett • 2024 Comprehensive Sewer Plan • October 2025 Executive Summary • ES-5 Regulatory Requirements Collection, conveyance, and treatment facilities operation, design, and construction are regulated through federal, State of Washington, Snohomish County, and City regulations. The 2024 Plan must comply with the requirements listed in RCW 90.48.110 and WAC 173-240; and requires approval from Ecology. The regulations are detailed in Chapter 2. There are several Ecology regulations for the City pertaining to the collection and treatment of wastewater:  The National Pollutant Discharge Elimination System (NPDES) program, administered by Ecology, is the primary permit for the WPCF, which has been issued NPDES Permit No. WA0024490. The permit was issued on November 21, 2024, goes into effect on January 1, 2025, and expires on December 31, 2029.  Ecology approved a Pretreatment Program Modification in May 2024. This relates to emerging contaminants and treating wastewater from industrial users in the City service area.  Ecology also regulates CSO compliance in WAC 173-245 which limits CSO discharges to once per year on a 20-year moving average. CSO compliance is not a focus of the 2024 Plan as the City is addressing that through recent or concurrent planning studies for the Port Gardner Storage Facility (PGSF) project, and the 36th Street CSO Storage project.  Ecology initially issued the Puget Sound Nutrient General Permit (PSNGP), effective as of Jan. 1, 2022. The Pollution Control Hearings Board (PCHB) invalidated the PSNGP effective Feb. 28, 2025. A revised, draft PSNGP, was reissued June 18, 2025 and is a voluntary program that allows utilities to opt-in to the permit. A public comment review period is now closed, and Ecology is expected to make a decision on issuing the final permit in Fall/Winter of 2025. The City is coordinating with Ecology on the approach for developing nitrogen limits at the time of this Plan.  The WPCF also has coverage under the Statewide 2015 General Permit for Biosolids Management as an ‘active biosolids facility’, permit number BA0024490. Biosolids from the WPCF are collected in the aerated lagoon system and stabilized to Class B requirements. The 2022 Statewide Biosolids General Permit was voided by the Pollution Control Hearings Board in January 2024 due to Ecology not meeting SEPA requirements in the issuance of the permit. Ecology did not appeal and later gave notice that all biosolids facilities covered under the Biosolids General Permit issued in 2015 will continue coverage under that version of the permit. Ecology developed a new SEPA review process and the issuance of a new permit that became effective February 1, 2025. Chapter 2 also outlines the collection system planning criteria that are used to develop projects included in the CIP; the level of service (LOS) methodology which defines how often the capacity criteria can be exceeded; and the system resiliency analysis/criteria which identifies risk for collection system assets from certain threats. Service Area and Vicinity Characteristics The City owns and operates a sanitary sewer collection system serving the residents and businesses within its approximate 39,300 acres service area, including majority of the City and extending south, into portions of Mukilteo, Mill Creek, and unincorporated Snohomish County. The sewer service area is divided into two sections: the combined system in the north and the separated system in the south. Areas that are within