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21 THE CITY OF �i4zr 111, pLEASANTON CITY COUNCIL AGENDA REPORT June 15, 2021 Operations Services TITLE: PER- AND POLYFLUOROALKYL SUBSTANCES (PFAS) TREATMENT AND WELLS REHABILITATION PROJECT UPDATE ON BASIS OF DESIGN REPORT AND APPROVAL TO PROCEED WITH FINAL DESIGN SUMMARY Per- and polyfluoroalkyl substances (PFAS) are unregulated contaminants of emerging concern in drinking water due to their health impacts and tendency to accumulate in groundwater. The California Division of Drinking Water (DDW) has provided a tentative schedule to begin regulating PFAS by establishing maximum contaminant levels (MCLS) for certain substances by early 2024. Through on-going testing, the City has confirmed the presence of PFAS in its Well 5, 6, and 8 groundwater supply facilities. In September of 2020, City Council supported a work plan to address PFAS that included the establishment of CIP 21166 - PFAS Treatment and Wells Rehabilitation Project (Project). The goal of the Project is to implement PFAS treatment and rehabilitate the well facilities to extend their useful life as safe, reliable, and locally controlled sources of water. To establish the scope of the Project, the City hired Carollo Engineers (Carollo) to prepare a Basis of Design Report (BODR). Carollo has completed the Draft BODR, and preliminary recommendations include constructing a centralized treatment facility (CTF) at the Operations Service Center (OSC), rehabilitating existing Well 6 and Well 8 facilities, and replacing Well 5 with a new facility. The Project cost estimate (including design, construction, and supporting services) is $46,000,000. Recommended next steps to advance the Project include finalizing the BODR and proceeding with the final design phase. RECOMMENDATION 1. Receive a presentation on the Draft BODR for the Project. 2. Approve finalization of the BODR based on the presented preliminary findings and recommendations. 3. Approve proceeding with the final design phase for the Project. Staff will select a design consultant and request authorization to execute an agreement at a future City Council meeting. FINANCIAL IMPACT The estimated budget for final design services for the Project is $2,800,000 with services occurring during FY21/22 and FY22/23. The Project is funded by CIP 21166 in the FY2021/22 CIP for $2,500,000. In addition, there is $300,000 that Council authorized reallocated from the potable water reuse study to the PFAS project. A