2022/08/17 Council Agenda Packet

SECTION 2 - SPECIFICATIONS 2.1 INTENT The City of Everett received a Washington State Department of Ecology grant to improve the water quality in the stormwater runoff at four different outfall locations within the city. 2.2 The City of Everett is seeking a supplier to provide Bio Clean Modular Wetlands° System (MWS) Linear units for an upcoming project. The MWS must be manufactured to meet site constraints and match proposed elevations and pipe configurations. The proposed units must be delivered to the project site ready to be installed in accordance with the manufacturer's recommended installation procedures. The City of Everett will be responsible for installation of the MWS units. BACKGROUND The Bio Clean Modular Wetlands° System Linear unit was selected to meet the needs of the city as a part of an Ecology Grant project. The purpose of the project is to improve water quality in Port Gardner Bay through design and installation of MWS — Liner Stormwater Treatment Systems at four or more outfalls in the City of Everett. These systems will treat stormwater runoff from approximately 20 acres of pollution - generating impervious surfaces with the area. Modular Wetlands° Linear systems are a biofiltration system that use a patented horizontal flow to treat stormwater, which improves performance, reduces footprint, and minimizes maintenance. The MWS Linear replicates natural processes to remove a variety of pollutants from stormwater runoff including fine total suspended solids (TSS), bacteria, oils, and grease, as well as heavy metals and harmful nutrients like nitrates and phosphorus. The Bio Clean Modular Wetland System Linear unit has been Washington State Technology Assessment Protocol — Ecology (TAPE) for General Use Level Designation (GULD) for the MWS-Linear Modular Wetland Stormwater Treatment System for Basic, Phosphorus, and Enhanced treatment. 2.3 SPECIFICATIONS Based on the site restraints, the Modular Wetland System -Linear Structure must meet the following requirements: A. Modular Wetland System (MWS) - Linear: 1. Unit must be a Modular Wetland vault type system. 2. Unit must include required filter media for operation. 3. Unit and all its components, including filter media, must be self-contained within the concrete structure. a. Filter media must be located at least 2" from the structure walls. 4. Unit must be constructed of concrete with a minimum 28-day compressive strength of 5,000 psi. 5. Reinforcement must conform to ASTM A 615 (rebar) or ASTM A 706 (welded wire), Grade 60 rebar and supports. 6. Access hatches be H-20 load -rated and must require less than 50 pounds of force to open. 7. Unit must include utility anchors to move around the jobsite with a crane. Page 7 of 20