Project Information

Bid Title

Wastewater Treatment Plant Nutrient Removal Alternatives Evaluation and Facilities Plan Project

Issuing Agency

City of Benicia

Location

California

Published Date

Oct 20, 2025

Closing Date

Nov 20, 2025

Government Level

State & Local

Status

Closed

Ref. #

RFP# 26-013

Original Source

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Bid Documents

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Project Description

Project ID: RFP# 26-013

Title: Wastewater Treatment Plant Nutrient Removal Alternatives Evaluation and Facilities Plan Project

Addenda: 0

Release Date: 10/20/2025

Due Date: 11/20/2025

Post Information

Posted At:Mon, Oct 20, 2025 7:53 AMSealed Bid Process:Yes (Bids Sealed / Pricing Sealed)Private Bid:No

Overview

Summary

The City of Benicia is soliciting proposals from qualified consulting firms to prepare a Facilities Plan evaluating nutrient removal technologies and alternatives to address new nutrient reduction requirements or potential water resilience needs.

The selected consultant will review existing background data, develop a whole-plant process model, identify and evaluate feasible nutrient removal and resiliency alternatives, and prepare a comprehensive facilities plan detailing findings and implementation strategies. Optional tasks may include a wastewater characterization study to refine the process model prior to design.

The project duration is anticipated to be approximately ten (10) months. All deliverables will be submitted in PDF format. The City of Benicia looks forward to collaborating with an experienced consulting firm to address this new regional challenge.

Background

On July 10, 2024, the Regional Water Board adopted Order R2-2024-0013 that outlines waste discharge requirements for nutrients from municipal wastewater discharges to San Francisco Bay (NPDES Permit CA0038873). As part of this order, the City of Benicia Wastewater Treatment Plant’s (WWTP) effluent was required to meet an interim effluent limit of 290 kg/day of total inorganic nitrogen (TIN) starting October 1, 2024, and a final effluent limit of 120 kg/day of TIN starting October 1, 2034. The interim and final limits are for the average discharge from May 1 through September 30 of each year.

There are two potentially significant factors in Benicia that may affect the analysis of alternative means of removing TIN. There is a proposed development, the “Rose Estates Development”, that is expected to go forward, and that is expected to increase the loading to the City’s WWTP by roughly 0.5 MGD that may be slightly more concentrated as a result of modern water fixture building requirements. This should factor in as an addition to what is found in existing data, and any data generated on loading rates over the course of this work. There is also a possibility that the Valero Benicia Refinery will cease to be operated by Valero Refining Company. If this happens, and if another petroleum corporation does not take over operation of the facility, it will have a great impact on the City’s Water Treatment Plant and Distribution system, which may lead to a greater interest by the City to review options of direct or indirect potable reuse, or recycled water for overall water resiliency.

Timeline

City Issues RFP:

October 20, 2025

Question Submission Deadline:

October 31, 2025, 11:59pm

Question Response Deadline:

November 6, 2025, 4:30pm

Proposal Submission Deadline:

November 20, 2025, 2:30pm

Selection Interviews:

December 3, 2025 - from 8:00 AM to 12:00 PM

City of Benicia WWTP
614 East 5th Street
Benicia, CA 94510

Negotiate and agree to final contract terms:

December 10, 2025

Award of Agreement:

December 19, 2025

Execute agreement:

January 21, 2026

Project Agreement Start Date:

January 22, 2026

Commodity Codes

• NAICS 221320Sewage Treatment Facilities
• NAICS 236220Commercial and Institutional Building Construction
• NAICS 237110Water and Sewer Line and Related Structures Construction
• NAICS 541611Administrative Management and General Management Consulting Services
• NAICS 541620Environmental Consulting Services
• NAICS 541690Other Scientific and Technical Consulting Services
• NAICS 561210Facilities Support Services

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