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Engineers includes preparing that documentation which is estimated to cost $50,000 and will be funded through the Capital Improvement Program (CIP) Project 21166, which has already been approved by Council. Securing grant funding for the PFAS project reduces the amount of financing required which reduces the impact to the City's rate payers. BACKGROUND PFAS are a large group of man-made substances that have been extensively used since the 1940s in common consumer products designed to be waterproof, stain- resistant, or nonstick. In addition, these substances have been used in fire-retarding foam and various industrial processes. PFAS are unregulated contaminants of emerging concern in drinking water due to their health impacts and tendency to accumulate in groundwater. Perfluorooctanesulfonic acid (PFOS) and perfluorooctanoicacid (PFOA) are the most studied substances and are the focus of initial regulatory efforts in California. The EPA and DDW have provided tentative schedules to begin regulating PFAS by establishing MCLS for PFOA and PFOS by late 2023 — early 2024. EPA and DDW have also started the process of reviewing other PFAS for possible regulation, but a schedule has not yet been identified. The City began testing its groundwater for PFAS in the second quarter of 2019 in compliance with general orders issued by DDW to numerous water agencies. Test results have shown that the City's Wells 5, 6, and 8 groundwater supply facilities contain the presence of PFAS. Well 8 contains the presence of PFOS above advisory levels and as a result, has not been operating since June 2019. On September 1, 2020, City Council supported a work plan to address PFAS that: • Prioritizes efforts on advancing the planning, design, and construction of self-implemented PFAS treatment at City wells. • Explores regional alternatives with Zone 7 on a parallel path. To begin the process of self-implemented PFAS treatment, the City established CIP21166 - PFAS Treatment and Wells Rehabilitation Project (Project). The goal of the Project is to extend the useful life of Wells 5, 6, and 8 as safe, reliable, and locally controlled sources of water for the City by: • Implementing a PFAS treatment system that can reduce concentrations to meet the City's low-treatment goal (defined as the consumer confidence report detection levels listed in the current DOW Order DW-2020-0003-DDW). • Rehabilitating and/or replacing the well facilities to extend their useful life by 30 years to be comparable to the useful life of a new PFAS treatment system. • Allowing for expansion of the PFAS treatment system site to accommodate potential future water treatment regulations. • Implementing improvements in a timely fashion to increase probability of commissioning facilities prior to the required PFAS regulatory compliance date and reduce the risk/duration for purchasing supplemental water from Zone 7. Page 2 of 4