CCMIN 06152021 - Laserfiche WebLink

MOTION: It was m/s by Arkin/Testa to adopt Resolution No. 21-1227 approving the two-year Operating Budget for FY 2021/22 and 2022/23 as amended. Motion passed by the following vote: Ayes: Councilmembers Arkin, Balch, Narum, Testa, Mayor Brown Noes: None Abstain: None Absent: None 22. Presentation regarding Per-and Polyfluoroalkyl Substances (PFAS) Treatment and Wells Rehabilitation Project Update on Basis of Design Report and authorization to proceed with final design Director of Operations and Water Utilities Kathleen Yurchak introduced the item. Utilities Planning Manager, Todd Yamello explained PFAS are currently being considered for regulation and advised the State Water Board has issued advisory levels for the three of the compounds. If concentration levels are found above the notification level the City must notify the governing board and the State recommends mitigation which usually means taking the water out of service for treatment. He reported the State is planning to regulate PFOS and PFOA by establishing maximum containment levels and noted they have a draft regulation identifying the value of those Maximum Contaminant Levels (MCLS) in the fall of 2022 and will have a final value somewhere in early 2024. Lastly, he advised there is no indication of an MCL date for PFBS at this time. He reported the City has three wells, Well 5, Well 6, and Well 8 that provide 20% of the City's water supply with the remaining 80% coming from Zone 7. He presented an overview of testing that has been completed since mid-2019. Well 8 is above the response level for PFOS and was taken out of service in June 2019. All wells are below the response level for PFOA. The City Council approved a work plan for the long-term treatment of PFAS at Well 5, 6, and 8 on September 1, 2020. The work plan had two major components with the first being to proceed with a self- implemented PFAS treatment project at Wells 5, 6, and 8. This allows the City to have control and the best ability to try to implement the project and meet an MCL target coming in 2024. The secondary effort was to explore regional solutions on a parallel with Zone 7. The project goals included implementing PFAS treatment at all wells to `low-treatment" goal, rehabilitating existing well facilities to extend their useful life 30 years, and providing for treatment expansion. An agreement was approved by the City Council in September 2020 to prepare a Basis of Design Report(BODR)to define the scope of the project and serve as a basis for the final design. Utilities Planning Manager Yamello reported Wells 5, 6, and 8 are on a very good performing aquifer and can produce water from the aquifer very energy efficiently. Wells 5 and 6 are nearing the end of their useful life. Well 8 was built in the early 1990s but is not as energy efficient as Wells 5 and 6. He provided an overview of recommended improvements to rehabilitate all three well facilities. It is recommended to abandon the existing Well 5 facility as it is reaching the end of its lifecycle. The problem with replacement is that the site is very constrained and there is not enough room to install a new well effectively. The well is also below-grade in a vault and any new well casings must be above ground per State requirements. It is recommended to construct a new Well 9 at Amador Park to replace Well 5. It is recommended that Well 6 be rehabilitated including replacing the casing, reusing and rehabilitating the existing building, and replacing mechanical and electrical systems. There would be temporary impacts to Alisal Elementary School access during construction and would require coordination with PUSD. The benefit of staying in this location is that it is close to the high-performing aquifer. City Council Minutes Page 7 of 10 June 15. 2021