Site work, paving and renovation of a mixed-use development in Manteca, California. Working plans call for the renovation of a sidewalk / parking lot; for site work for a sidewalk / parking lot; for paving for a sidewalk / parking lot; water / sewer project; and water / sewer project.

**As of February 26, 2026, this project has not yet been awarded. A timeline for the award has not yet been established.** The City of Manteca ("City") is issuing this Request for Proposals (RFP) to invite the entities identified below (Proposers) to submit a Proposal to provide integrated design and construction services of new facilities related to sidestream treatment and ultraviolet (UV) disinfection project (CIP 25004 & 25005) (Project). Introduction The Project Consists of Two Main Components, Ultraviolet (Uv) Disinfection Facility Improvements and a New Sidestream Treatment Facility. The Uv Improvements Generally Consist of Constructing a New Uv Facility to Replace the Current Facility, Installing New Influent and Effluent Piping, Altering the Effluent Pump Station and Existing Uv Facility, Revisions to the Flow Meter Vault and Influent Piping, and Electrical and Instrumentation Equipment. The Sidestream Treatment Facility Generally Consists of Intercepting And Diverting Centrate Flows From the Existing Centrifuges, Constructing New Equalization (Eq) Basins and Reactors, a Blower and Electrical/Control Building, and Modifications To The Electrical Feed. A. UV Facility The existing UV facility consists of an inlet basin, two UV channels, and a wet well with an effluent pump station. Electrical room containers rest over enclosed spaces on each side of the channels, powering each channel independently. The system cables are fed through the enclosed space to the UV channels via cable trays and conduits. The master control panel is located in the southern electrical container. The facility is electrically fed from the adjacent effluent motor control center (MCC)/generator building. A bridge crane spans the entire structure, allowing removal of UV banks/modules and pumps. The existing UV disinfection system was installed in 2007 and is approaching the end of its useful life. Operations staff have noted differences in performance between the two channels with no logical explanation. The UV manufacturer, Wedeco (a Xylem brand), has assisted the City in investigating the differences, but has not been able to determine a reason for the varied performance. The existing south channel has had more coliform hits necessitating increasing the UV dose setpoint to over 200 millijoules per square centimeter (mJ/cm2), using significantly more energy than called for in the design to achieve the permitted disinfection levels. City staff have indicated that they lack confidence in the reliability of this channel and use the north channel as the duty channel. Several UV manufacturers were evaluated as part of the project and a recommendation was made for implementation of the Trojan UVSigna 2-Rowsystem. This system was recommended due to lower capital, operations and maintenance, and life-cycle costs, as well as ease of operation and maintenance. B. Sidestream Treatment The Sidestream Refers to the Liquid (Centrate) Separated From the Biosolids During The Dewatering Process. A Significant Amount of Nutrient Load Can Be Found in The Sidestream, Particularly Nitrogen, Contributing About 15 to 20 Percent of The Influent Load but Typically Only Around 1 Percent of the Influent Flow. The High Nutrient Load Sidestream Is Typically Returned to the Head of the Facility, Therefore Increasing the Nutrient Load on the Mainstream Liquid Treatment. Capturing And Treating the Nutrient Rich Sidestream Has Proven to Be a More Efficient And Cost-Effective Way to Reduce the Overall Nutrient Load on the System Compared To The Mainstream Conventional Treatment. Several Treatment Technologies Were Evaluated as Part of the Project and A Recommendation Was Made for Implementation of the Anita Mox Process By Veolia. Anita Mox Process Was Recommended Due to Less Process Equipment, Simpler Controls, and Being Less Susceptible to Losing Biomass Through Washout Events. Based on Discussions With Plant Staff, Two Parallel Sidestream Treatment Reactors and Eq Basins Are Desired to Provide Additional Flexibility for Operations And Equipment Maintenance. Project Delivery and Contracting Approach As described in the Request for Qualifications (RFQ) issued by the City on April 1, 2025, the Project will be delivered using the Progressive Design-Build (PDB) project delivery approach. Using the PDB project delivery method, the successful Proposer (DB Firm) will provide design and construction services for the Project in two phases. 1. Preconstruction Phase: The City will issue a contract (PDB Agreement) with the DB Firm to provide Preconstruction Phase services for the development of the design for the Project. During this phase, the DB Firm will advance the design to approximately 75 percent completion and present a construction schedule and an open book Guaranteed Maximum Price (GMP) to the City. The GMP will include the cost of the Construction Phase work through commissioning and start-up, general conditions pricing, overhead, and profit. 2. Construction Phase: Should the City and DB Firm agree on the GMP, the Construction Phase services will be authorized and initiated by an amendment to the PDB Agreement following City Council approval. The DB Firm will procure all subcontractors and vendors, and will be responsible for the Project's construction, startup, commissioning, operator training, performance testing, and warranty services as will be described in the RFP and PDB Agreement. Should the City and the DB Firm be unable to agree on a price for the Construction Phase services, the City reserves the right to terminate the PDB Agreement and begin negotiations with another DB Firm or complete the design and prepare construction documents for public bidding of the Project. There is no DBE goal for this project. Deadline to Request Clarifications/Questions Thursday, January 8, 2026, 2:00 p.m Q&A and/or Addenda Publication Thursday, January 15, 2025 All related questions and answers and any addenda will be published on the City website Kyzen Nicolas will act as the City 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 City Contact as follows: Kyzen Nicolas Associate Engineer knicolas@manteca.gov Copy: George Phan Assistant Engineer gphan@manteca.gov The City reserves the right to accept or reject any and all proposals, or any item or part thereof, or to waive any informalities or irregularities in proposals. The City reserves the right to withdraw or cancel this RFP at any time without prior notice and the City makes no representation that any contract will be awarded to any firm responding to this RFP. The City reserves the right to re-issue a new RFP for the same or similar services. The City reserves the right to postpone proposal openings for its own convenience. Proposals received by the City are public information and must be made available to any person upon request. Submitted proposals are not to be copyrighted.