Brown and Caldwell Inc. 6/1/2021

City of Everett Water Treatment Plant Portal 4 Improvements I Scope of Work • Review the Everett Water Transmission and Distribution System Operations and Maintenance Manual(2002)to inform this analysis. • Review North Corridor flow controls including in-town reservoir operations, wholesale purveyor agreements, Panther Creek controls, and Finished Water Pump Station controls. • Conduct workshop with Plant Staff and TSG group to collect information about North Corridor operations and operational issues. • Develop alternatives and recommendations for the North Corridor control scheme. • Conduct workshop with Plant Staff to review alternatives and recommendations. • Develop a technical memo summarizing alternatives and recommendations. (10 pages maximum) Everett Responsibilities • Provide copy of Transmission Analysis report and Transmission and Distribution Operations and Maintenance Manual. • Provide input on alternatives and recommendations. • Participate in workshops. • Supply relevant operations data, wholesale purveyor agreements, and control strategies. Task Assumptions • Recommendations will provide the basis for the control strategy and design of the control valves in Portal 4. • Recommendations will be developed through a review of supplied documents by others and BC's ongoing work on the Finished Water Pump Station and through the associated workshops with the City . No additional hydraulic modeling or numerical analysis will be needed. Meetings • North Corridor operations workshop. Assume attended by three BC staff, with a duration of two hours, conducted via video conference. • North Corridor recommendations workshop. Assume attended by three BC staff, with a duration of two hours, conducted via video conference. Work Products • North Corridor Flow Controls Evaluation, Alternatives, and Recommendations technical memorandum, draft and final. Task 300 Basis of Design Activities/Approach: BC will perform evaluations to finalize all major design decisions and provide design criteria and equipment selections for the Portal 4 improvements. This information will be presented in a Basis of Design Report. Specific task activities include: • Conduct site visit to verify field conditions and interview Plant Staff to confirm scope of improvements needed. • Evaluate suitability of re-using existing 2" conduit and existing cable vs new conduit and/or cable and review potential alternative route(s)for upgrading buried electrical service to Portal 4. o The Portal 4 design package will include the following improvements: • Replace/repair corroded structural elements.Analyze structure for required repairs. • Remove rust stains. Evaluate coating options. • Replace door • Remove and seal off louver openings Page 3 of 6