Brown and Caldwell Inc. 3/3/2021 Amendment 2

• Review available historical water demand records for the past 5 years, including records of water transmission via pumped flow and gravity flow. • Review any recent changes to the City's transmission pipes that may alter the anticipated future split between gravity and pumped flows. • Review water demand projections in most recent Water System Plan. • Make adjustments to water demand projections based on recent data as needed. • Review design as well as any operating data for all FWPS 1 and 2 pumps, including pump curves and control strategy. • Develop a hydraulic model with the pump curves and system curves. The model will help assess whether the pumps and/or pump station configuration are contributing to vibration issues and the need for excess pump maintenance. • Determine pumping requirements (number of pumps required)for a range of conditions.These conditions may range from average day winter demands at the low end to the maximum filter capacity at the high end (as the filter capacity limits the overall plant capacity),taking into account typical and maximum allowable splits of gravity transmission and pressurized transmission flows.This would provide a range of trigger points when additional pumps would need to be placed on-line. • Review "City of Everett Drinking Water Plant Wire to Water Efficiency Analysis" report provided by the City as part of the analysis and in developing recommendations for the pump stations. • Develop recommendations to optimize control strategy. • Develop recommendations for FWPS 1 and FWPS 2 to optimize pump performance including net positive suction head recommendations. • Develop a design sketch for an intake flow straightening fixture for FWPS 2 pumps. • Conduct two workshops with Plant Staff to discuss findings and recommendations of the finished water pump station analysis. • Conduct a water filtration plant site visit to inspect the finished water pumps while in operation and discuss finished water pump performance with plant staff.Two technical staff to attend site visit. • Conduct a site visit during the rebuild of finished water pumps 5 or 6 to inspect internal pump components to assess potential causes of cavitation events. Two technical staff to attend the site visit. • Conduct a follow up site visit after the re-build of finished water pumps 5 or 6 during pump start u • Develop a Finished Water Pump Station Evaluation TM to document the evaluation approach and findings. Everett Responsibilities • Provide direction and authorization for requested additional work. • Provide water demand data for the past 5 years. • Provide pump design data including any vendor submittals. • Provide pump operating data and control strategy. • Participate in workshops with appropriate operators and other staff. • Host three site visits from BC technical staff. Work Products • Workshop Facilitation including Agenda and Meeting Notes, draft and final. Page 4 of 8