Bid Details for Delta Diablo SECONDARY PROCESS IMPROVEMENTS PHASE 1

Project
Delta Diablo SECONDARY PROCESS IMPROVEMENTS PHASE 1
Owner
Delta Diablo
Bid Time
08/05/2026 2:00 pm
Description

In accordance with Drawings and Specifications prepared by HDR Engineering, Inc., the Work includes furnishing of all labor, materials, tax, equipment, incidentals and services for the construction and completion of the Secondary Process Improvements Phase 1 (“Project”). The Work includes but is not limited to construction of three (3) new aeration basins, one (1) new secondary clarifier, two (2) new pumping stations for return activated sludge (RAS) and surface waste activated sludge (SWAS), and associated above and below-grade process piping; installation of new aeration blowers, rotary drum thickeners, and hydrocyclones; modifications to the Primary Effluent Pumping Station (existing Tower Trickling Filter Pumping Station), including the installation of new pumps; modifications to the existing Sanitary Drain Pumping Station; installation of new sodium hypochlorite metering pumps and new hydrocyclone pumps, and one (1) new polymer pump; surface and site improvements including modified parking areas, grading, paving and drainage; modifications to existing site utilities including but not limited to sewer, water, and gas; construction of a new electrical building and installation of two (2) new MCCs; construction of a new standby generator and fuel tank as well as the construction of new electrical duct banks to support the new process facilities; the demolition of existing Aeration Basin 5, the Tower Trickling Filters, and Tower Trickling Filter odor control system (biofilter); and all other additional work as needed to construct a complete project as specified in the Contract Documents.

 

The Contract Time for the completion of all the Work of the Project is 1,460 calendar Days.

 

PROJECT LABOR AGREEMENT

Location
2500 Pittsburg-Antioch Highway, Antioch, CA 94509
Amount
$ 165,000,000
Bid Walk

A mandatory pre-bid meeting and project walk-through will be held on July 15, 2026, at 10:00
a.m. at the Delta Diablo WWTP. Shortly after this pre-bid meeting, a mandatory project site walkthrough
will occur at the project site location.

Requirements
Electrical Subcontractors have already been prequalified to bid.
Availability
Complete sets of Contract Documents and related Supplemental Project Information Available to Bidders are online via Planet Bids (https://vendors.planetbids.com/portal/72798/portal-home) hardcopies for purchase directly from the District are not available.