Washington Department of Ecology 12/23/2025

Page 2 of 45State of Washington Department of Ecology Agreement No: Project Title: Recipient Name: WQC-2026-EverPW-00408 City of Everett Port Gardner Water Quality Program – Phase 2 Construction City of Everett ECOLOGY funded the design of the regional stormwater treatment facility and conveyance under grant WQC-2024-EverPW-00027. The RECIPIENT split the design into two phases. This project will construct phase 1 of the design, which includes the foundation and 2 out of 8 concrete cells of a 7,000 square foot Filterra Bioscape and a pump station to support the hydraulic pressure needed for the local stormwater to reach the Bioscape system. The RECIPIENT will equip 2 cells of the Filterra with underdrains and soil media to treat stormwater from an initial 15-acre urban, primarily impervious, contributing area. The remaining 6 cells will contain clean fill and native vegetation mix. Subsequent construction projects will connect incrementally greater contributing areas to the Filterra until the entire 7,000 square foot area of the Filterra is equipped with the underdrains and soil media needed to treat stormwater from 300 acres of contributing area. This project will treat stormwater for total suspended solids (TSS), oil (total petroleum hydrocarbons), dissolved copper and zinc, and total phosphorus. Treated water will discharge to Port Gardner Bay and Puget Sound through existing permitted Outfall 100 (NPDES Permit #WA0024490). Pipes connected to Outfall 100 will convey the treated stormwater for approximately 8,000 feet underground and 4,500 feet under Port Garder Bay to the discharge point in the bay . Overall Goal: This project will help protect and restore water quality in Washington State by reducing stormwater impacts from existing infrastructure and development. Template Version 12/10/2020 Docusign Envelope ID: D814CB0A-309D-42B0-8AE7-7273045711DF