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February 4, 2025 Page 14 7357-016j detectable levels of PFOS and PFOA, among other PFAS chemicals, in its water supply wells. The City filed a lawsuit against 3M for its release, use, and storage of PFAS products at and/or in the vicinity of the City’s water supplies.60 The complaint alleged that 3M allowed PFOS, PFOA, and their chemical precursors to enter the environment, and migrate through the soil, sediment, surface water, and groundwater, thereby contaminating the City’s property groundwater wells. The City and 3M e entered into a settlement agreement to cover the substantial costs of removing these “forever chemicals” from the City’s water supply or finding alternate water supply sources. In September 2022, the Pleasanton City Council directed City staff to suspend the evaluation of the PFAS Treatment and Wells Rehabilitation Project in order to evaluate water supply alternatives that could replace the water previously supplied by the City’s existing groundwater wells. The City has effectively abandoned efforts to remediate wells due to PFAS contamination, and instead considered other alternatives: “two alternatives involved water treatment solutions and one examined the purchase of water from Zone 7 to meet all City drinking water needs. The final option was the construction of two new groundwater wells located within the Bernal subbasin in an area located outside of the influence of PFAS contamination that would cost-effectively deliver to City residents high- quality, reliable drinking water needs each year.”61 The PFAS within the groundwater beneath the Project sites remains and it does not appear the City is making any current efforts to remediate it. The DEIR’s failure to mention, or include any substantive analysis, of the significant PFAS contamination beneath the Project sites resulted in a failure to inform the public of the Projects’ potentially significant environmental impacts. The Staff Report addresses but does not resolve the issue of existing PFAS contamination beneath the Project sites.62 The City must prepare a new DEIR, or revise and recirculate the Arroyo Lago DEIR, to accurately measure and mitigate the PFAS contamination on and adjacent to the Project sites. 60 Id. 61 City of Pleasanton, News, Pleasanton City Council Approves Two New Water Wells to Meet Long - Term Drinking Water Needs (Oct. 17, 2023), available at: https://www.cityofpleasantonca.gov/news/pleasanton-city-council-approves-two-new-water-wellsto- meet-long-term-drinking-water-needs/. 62 Staff Report, p. 7 of 18.