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• The possibility of reduced future water supply needs or the ability to offset well supplywith Zone 7 purchases has notyet been determined. 2. Self -implemented PFAS treatment planning and design should be based on the following criteria: • Selection of the Low Treatment Goal. This goal better matches the trend of regulations, its selection does not impact capital costs (with the exception that Well 5/6 treatment may not be needed with the High Treatment Goal), and operation and annual costs can be adjusted to meet actual regulatory limits. • Although IX media currently has the lowest life cycle cost, the treatment solution should provide the treatment infrastructure and site spacing that are designed to be able to allow a switch to GAC media. It is important to provide this flexibility since technology is rapidly evolving. • Include space for treatment expansion to address other containments of emerging concern. 3. The first phase of a self -implemented PFAS treatment project should be to prepare a basis of design report that: • Selects a preferred location for PFAS treatment (i.e. dedicated at each well site vs. centralized at Well 8) • Defines and coordinates the overall project scope to include rehabilitation of wells facilities to extend their useful life • Outlines the basis for final design including design criteria and scope, preliminary drawings, identification of CEQA and permitting requirements, and establishmentof a construction cost estimate and schedule. • Performs bench testing to confirm media replacement frequencies and life- cycle costs for PFAS treatment • Refines cost estimate information so it can be incorporated into the Water Rate Study to understand financial impacts to customers. Staff recommends that City Council approve an agreement with Carollo Engineers in the amountof $437,374 to prepare the report. The agreement is included as Attachment 3. 4. Continue to explore regional solutions and monitor variables that may impactwork plan direction. Advance the City's Water Capacity Evaluation — Efforts related to PFAS include evaluating possible reductions in well capacity needs based on future demand projections and evaluation of modified operational strategies, and technical feasibility to increase Zone 7 supplythrough turnouts and the City's distribution system. Zone 7 PFAS Treatment Efforts — Continue to monitor Zone 7 efforts to treat PFAS including any possibilities for participation in regional treatment facilities. Page 8 of 9