CCMIN 06152021 - Laserfiche WebLink

It is recommended that Well 8 be rehabilitated including replacing the existing casing, reusing and rehabilitating the existing building, replacing mechanical systems, and installing a new electrical building. Mr. Yamello reported that the City reviewed two alternatives which included doing PFAS treatment at each well or trying to go to a Centralized Treatment Facility. Centralized treatment was found to be more cost-effective and more beneficial, particularly for Wells 5 and 6; building treatment was not feasible and would require going into Amador Park with a significant footprint that would have a great impact beyond price. The Centralized Treatment Facility would have lower lifecycle costs. A Centralized Treatment Facility would be built within the fence line of the Operation Service Center right next to Well 8. After the water is treated for disinfection, PFAS, and fluoride it would enter the distributions system to all users. He presented renderings of the Centralized Treatment Facility and reported the facility would be rated for 8,100 gallons per minute which is the capacity for all three wells running simultaneously including getting the maximum capacity out of Well 8. He noted all wells are not operated simultaneously and that would only be for emergency conditions. Mr. Yamello provided an overview of the project timeline. Project design would begin in the middle to end of this year to include field testing, detailed design, CEQA, and the design for the Well 8 and 9 casings. The project could go out to bid in early to mid-2023. The project would be built in two phases with anticipated MCLs from the State hopefully available during the design phase before heading into construction. The final MCL should be available in 2024 and should be in line with having the new Central Treatment Facility online and two of three wells available to operate. The third well is more of a redundancy for emergencies and would probably come online after the final MCL. Total construction cost is estimated at $34.6 million with approximately $20 million toward PFAS improvements. The well rehabilitations range from $4.5 million to $5.5 million. Well 5 which will be the new Well 9 at Amador Park is more expensive because it is new. Total project costs are $46 million. The next steps are to finalize the BODR based on presented preliminary findings and recommendations and proceed with the final design phase which will include staff selecting a consultant and requesting authorization to execute an agreement during a future City Council meeting. City Manager Fialho advised that a draft element of the financial plan would be submitted to the subcommittee and staff would then be able to talk about funding sources and potential impacts on rates. Mr. Yamello reported Zone 7 is proceeding with a project to treat their Chain of Lakes wells and has a similar timeline and project costs. He is unsure what the future rates will be for Zone 7. Zone 7 needs to meet those MCL levels independent of Pleasanton and the distribution systems cannot be blended. Managing Director of Utilities and Environmental Services Daniel Repp advised that for well design often they are looking at the physical parameters of the aquifer to make decisions about sizing. A single well can pump the City's allotment but sizing should be based on the physical characteristics and the operator's ability to produce. He advised they are not looking at the allotment for well design. City Manager Fialho reported the debt service would be in the range of$3 to $3.5 million at a much lower interest rate than 10 years ago. He advised the City can use a combination of grants, connection fees, and then rate increases, so the number would be lower. The City applied jointly with Zone 7 to the federal agency that disperses the grants. He advised the State Revolving Fund is allowed for water infrastructure and is 1% interest. Director Yurchak advised they did not go into detail of determining how much it would cost to purchase water from Zone 7 with considerations in regards to infrastructure, governance, and contractual obligations. The preferred method is to pursue the Centralized Treatment Facility. Investigating additional alternatives can create an implication in the timeline to meet the MCL. City Council Minutes Page 8 of 10 June 15, 2021