MWH Constructors, Inc, serving as the Construction Manager at Risk (CMR) and representing CITY OF AUSTIN, TEXAS - AUSTIN WATER, is providing notice of a competitive sealed proposal (CSP) for an upcoming project: Walnut Creek WWTP Expansion to 100 MGD and Enhancements – GMP 6 Work Packages for this Competitive Sealed Proposal (CSP) are: Proposal Package S602 - Yard Piping Proposal Package S603 –Site Structures and Water-Bearing Concrete Proposal Package S605 - Elevated Water Storage Tank Proposal Package S615 - Process Equipment and Above Ground Process Piping Proposal Package S616 - Electrical/I&C Proposal Period: Starts Thursday, December 11, 2025 and Ends Thursday, February 5, 2026 This project, designed by AECOM, consists of construction of a variety of architectural buildings, underground piping, concrete water-bearing structures, elevated water storage tank, installation of process equipment and piping, and all associated electrical work. S602 Yard Piping, Estimated Construction Cost: $8,400,000. Scope consists of: underground wet utilities, all water/sewer/storm drains, valves, manholes, vaults and appurtenances. Excludes: process equipment and above-ground process piping. S603 Architectural Structures and Water Bearing Concrete Structures, Estimated Construction Cost: $47,200,000. Scope consists of: all CSI divisions, structural shell and architectural interior, sub grade preparation for SOG, Excavation, demolition, site preparation, backfilling, storm drain piping and basins, miscellaneous metals, and concrete pipe supports. Excludes: mechanical and process equipment. S605 Elevated Water Storage Tank Estimated Construction Cost: $3,500,000. Scope consists of: Design/fabrication of elevated storage tank, construction of drilled pier foundations, tank erection, and installation of all associated process pipe. S615 Process Equipment and Above Ground Process Piping, Estimated Construction Cost: $26,800,000. Scope consists of: All exposed piping, process equipment, non-concrete pipe supports, O&M, and training. S616 Electrical/I&C, Estimated Construction Cost: $17,800,000. Scope consists of: electrical duct bank, Electrical gear, conduit, wiring, and I&C devices. The objective of the five work packages is to break the work down into manageable contracts while ensuring the proposing contractor captures all scope in the design documents in its entirety (Whole & Complete). This project will have MBE/WBE participation goals, and relevant MBE/WBE contractor contact information will be provided to help meet these goals. All qualified contactors will receive consideration for award without regard to race, creed, color, religion, national origin, sexual orientation, gender identity, disability, veteran status, sex or age. This project will be a Contractor Controlled Insurance Program (CCIP) that provides General Liability, Excess Liability, and Workers Compensation insurance. Proposers must exclude the costs of these coverages from their proposals. To participate, all Contractors must first register as a potential proposer with MWH. To register as a potential proposer, please visit MWH's Public Plan Room (https://app.buildingconnected.com/public/59357015a974850b0051d1c0) Prime Contractors should join the Walnut Creek WWTP CMR – GMP 6 project. Subcontractors and vendors should join the Walnut Creek WWTP CMR – GMP 6 (Subcontractors) project. All subcontractors and vendors must work directly with the registered Prime Contractors to participate in this solicitation. Subcontractors and vendors' price and scope must be coordinated directly with Prime Contractors. The Prime Contractor's contact information will be posted and updated regularly on both project pages. If any difficulties arise, you can contact the Project's general email at: WCWWTPproposals@mwhconstructors.com All registered contractors will be provided with digital access to all necessary proposal documents, drawings, specifications, and project related information through the BuildingConnected platform when the proposal period starts on Thursday, December 11, 2025. A Pre-Proposal meeting for this project will be held virtually through MS Teams at 9:00 AM (CST) on Friday, December 19, 2025. An associated site walk/review will be held two days after the Pre-Proposal meeting at 10:30 AM (CST) on Friday, December 19, 2025. NOTICE IS HEREBY GIVEN that all Competitive Sealed Proposals (CSP) will be electronically received. They shall be uploaded through BuildingConnected by 2:00 PM (CST) Thursday, February 5, 2026. The eligible proposals will be electronically opened and read aloud at 3:00 PM (CST) Thursday, February 5, 2026 online using the MS Teams platform. This CSP will comply with applicable Texas Gov't Codes §252 and §2269. The successful Proposer will be selected by MWH on a rational best value basis. Evaluation factors outlined in the 02-Request for Proposal document of the CSP shall be applied to all eligible Responsive Proposers in comparing proposals and selecting the successful Proposer. Award of a contract may be made without discussion with Proposers after proposals are received. Proposals should, therefore, be submitted on the most favorable terms. Until the final award of this project, MWH reserves the right to reject any or all Proposals, retract and, if necessary, re-advertise this CSP without explanation, including waiving any informalities therein. December 11, 18 2025 IPLAAS0115569