Site work, new construction and renovation of a water / sewer project in Pleasanton, California. Completed plans call for the renovation of a water / sewer project; for site work for a water / sewer project; and for the construction of a water / sewer project.

For the past several years, Zone 7 has strategically and proactively invested in critical infrastructure to remove per- and polyfluoroalkyl substances (PFAS), commonly known as "forever chemicals," from groundwater supplies used for drinking water in the TriValley. As part of this proactive effort to continue providing drinking water that meets or exceeds state and federal regulatory standards, Zone 7 is developing the Mocho PFAS Treatment Plant and rehabilitating aging infrastructure of the Mocho wells to enable PFAS removal from this wellfield. The project will restore the production capacity and water supply reliability of the Mocho wellfield in Pleasanton to support continuous water delivery to the region. It will also remove operational constraints on the Mocho Groundwater Demineralization Plant (MGDP) which helps remove salt from the groundwater basin. o PFAS and salt removal through MGDP reverse osmosis (RO) trains, and the Mocho PFAS Treatment Plant removing PFAS from the water bypassing the RO trains, as shown in Figure 1 below . Process flow diagram for PFAS treatment from MGDP and the Mocho PFAS Treatment Plant o PFAS removal from all of the wellfield water through the Mocho PFAS Treatment Plant, with MGDP continuing to operate for salt removal from the groundwater basin, as shown in Figure 2 below: The primary difference between these options is the treatment capacity of the Mocho PFAS Treatment Plant and what future modifications are planned for to address if PFAS are removed through RO trains. Due to the increased head loss through the new treatment plant and conveyance pipelines, additional modifications are to be included to maintain the anticipated range of well flows and operational feed conditions for MGDP. Proposer to also assess the existing pipelines for pressure capacity and provide recommendations for required improvements. These modifications will be wholistically evaluated across this wellfield and will include both the replacement of the aging pumps at Mocho Well No 2, 3, and 4, and the expansion of MGDP to its initially anticipated full buildout capacity. Ion exchange (IX) media in pressure contactors has been identified as the treatment technology for the new Mocho PFAS Treatment Plant. This technology was selected to help control the visual impact to the surrounding community, reduce the footprint of the new facilities, and provide process consistency with other existing Zone 7 PFAS treatment plants. Pressure contactors may be able to accept some of the new and innovative PFAS treatment media being developed, once they become commercially viable, economically attractive, and supported by regulators. The IX media will be protected from solids through a pre-treatment system (e.g. cartridge filters). Facilities Question Deadline 10/31/2025 at 1:00 PM PT Questions be submitted to the Agency Contact electronically. All communications should be directed to the Agency Contact as follows: Mariza Sibal Project Manager Zone 7 Water Agency msibal@zone7water.com The anticipated cost of this project is $35-$51 million *The value for this project is based on a financial range. The value is listed as the highest possible cost from the range provided by a stakeholder or official project document. Mariza Sibal will act as the Agency Contact and shall administer the RFP process. All communications shall be submitted by email and shall specifically reference this RFP. All communications should be directed to the Agency Contact as follows: Mariza Sibal Project Manager Zone 7 Water Agency msibal@zone7water.com Performance bonds. A letter from the PDB Entity's surety to verify the ability of the of PDB Entity to secure (1) a performance bond in the amount of the Preconstruction Phase Services Fee (from Appendix C [Fee Proposal]), and (2) payment and performance bonds of at least $50 million for Early Construction and Construction Phase work. Each surety providing a letter under this Section 5.3.8 must qualify as an Eligible Surety under the PDB Agreement. The letter must specifically state that the surety/insurance company is an admitted surety or insurer (approved by the California Department of Insurance) and has read this RFP and evaluated Proposer's backlog and work-in-progress in determining its bonding capacity. Ability of the PDB Entity to provide the payment and performance bonds as described in Section 5.3.12. PDB Agreement Negotiated February 4, 2026 Board Award of Preconstruction Services February 18, 2026 PDB Team Notice to Proceed 1 March 16, 2026 Project Substantial Completion June 2028 Project Final Completion and Acceptance August 2028 Notwithstanding anything to the contrary in this RFP, Agency reserves to itself all rights (which rights shall be exercisable by Agency in its sole discretion) available to it under applicable law, including, with or without cause and with or without notice, the right to: o Accept or reject any or all of the Proposals, responses, supplemental information or data, other submittals, or any parts thereof, received from Proposers at any time