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