Washington State Department of Ecology 5/5/2019

State ol'Washington Department of Ecology Page 2 of 38 Agreement No: WQC-2019-EverPW-00052 Project Title: Port Gardner Bay Outfalls Water Quality Treatment Retrofit Recipient Name: City of Everett Public Works Department discharge to Port Gardner Bay,which borders the City of Everett to the west.Together these outfalls collect stormwater from highly impervious,pollution-generating surfaces,consisting mostly of the heavily trafficked West Marine View Drive,which is the main arterial on the west side of Everett serving the Port of Everett and other industrial and recreational uses. Modular Wetland systems have been selected as the preferred treatment system for these locations after research into proprietary and green infrastructure stormwater treatment options.Use of the Modular Wetland systems will allow for removal of sediments,trash and debris,TSS,heavy metals,hydrocarbons,and phosphorous. The Modular Wetlands are proposed to be connected to existing stormwater pipes and are sized to treat the water quality design flow rate,with an internal or external bypass for large storm events. These installations will treat stormwater draining from primarily impervious areas and reduce the potential for discharges of TSS and dirty stormwater to sediment cleanup sites,which will improve the overall sediment and water quality of Port Gardner Bay and assist in the restoration of habitat and shorelines. Overall Goal: This project will help protect and restore water quality in Washington State by reducing stormwater impacts from existing infrastructure and development. Version 10/30/2015