2021/03/03 Council Agenda Packet

City of Everett Water Treatment Plant Facility Plan Amendment 2 I Scope of Work effluent piping, etc.) and modifications to filter operations that will meet the City's plant productivity target. Qualitative advantages/disadvantages will be summarized for these options and will be presented to the City during a virtual workshop. o Pending feedback from the City on preferred options, BC will perform an alternatives analysis on two selected alternatives for improvements. A third alternative, consisting of plant production if no improvements are made beyond filter re -rating (e.g. increasing filtration rates from 8 to 10 gpm/sf) will be presented as a baseline. Budget -level capital cost estimates will be developed for each alternative, along with description of necessary modifications to filter operations. Each alternative will include recommendations for • Provide recommendations for timeline and scope of recommended necessary plant improvements, process changes, etc. that should be implemented as a part of the rerating strategy. Everett Responsibilities • Provide copy of Pilot Work Plan and/or Interim or Final Pilot Study Reports as they become available. • Identify plant production targets/operating scenarios to be achieved via filter re -rating. • Provide review comments and other input to BC on rerating engineering submittal. Task Assumptions • BC's efforts will focus on assessment of the effects that re -rating will have on WFP hydraulics, processes (e.g. backwash, chem feed, rec. water pond pumps and pond level, etc.), and net filter production. BC will not evaluate potential impacts to finished water quality resulting from re -rating. • Communications with WSDOH are not requested at this time. Meetings • Assume 2 coordination and review virtual workshops, lasting 2 hours each and attended by 3 BC staff. Work Products • Technical memorandum summarizing analysis findings, with the necessary level of detail per DOH rerating guidelines for inclusion in a report the City will prepare and submit to DOH. Estimated page count is 10 to 20 pages, not including front end (e.g., table of contents, list of figures, etc.) and appendices. Page 8 of 8