Project Information

Bid Title

First Aqueduct Treated Water Bifurcation Structures and Hubbard Hill Vents Rehabilitation Sheltered Market

Issuing Agency

San Diego County Water Authority

Location

California

Published Date

Apr 10, 2025

Closing Date

Jul 30, 2025

Government Level

State & Local

Status

Closed

Original Source

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Bid Inquiries

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Bid Documents

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Project Description

The Water Authority’s First Aqueduct contains six tunnels to convey water by gravity through the hilly topography. At the entrance to each tunnel, buried concrete bifurcation structures combine flows from Pipelines 1 and 2 into a single tunnel. On the downstream side of each tunnel, the bifurcation structures split the flow from the single tunnel back into Pipelines 1 and 2. Above-grade concrete vent structures are also used in parts of the aqueduct piping to allow air entry and release at system high points. This project will rehabilitate six bifurcations and two vent structures in the northern portion of the First Aqueduct that delivers treated water.

The project will use cast in place concrete to provide seismic upgrades at these structures. New, precast concrete panels will be used to seal the tops of the modified bifurcation structures. Around the inside vent structures, fiber-reinforced polymer (FRP) composite fabric and high-modulus, precured carbon anchors will be installed. At-grade concrete pads will be poured around or adjacent to the structures and new chain link fencing will be installed. Pipeline shutdowns are also scheduled to facilitate the rehabilitation work inside the structures.

Estimated Advertising Date
06/01/2025 - 07/30/2025

Estimated Value
$2,500,000 - $3,500,000

Issue Date

Preproposal / Prebid Meeting Date

This meeting is mandatory

Solicitation Due Date

NIGP Codes

• NIGP 91430 Concrete
• NIGP 75030 Concrete, Precast
• NIGP 75070 Ready-Mix Concrete
• NIGP 57076 Steel, Reinforcing, Bars and Rods
• NIGP 33013 Fencing, Chain Link (Including Fabric, Gates, Panels, Posts and Fittings)

Contact
Jim Zhou

Senior Engineer
jzhou@sdcwa.org

Links

Commodity Codes

• NAICS 237110Water and Sewer Line and Related Structures Construction
• NAICS 237310Highway, Street, and Bridge Construction
• NAICS 237990Other Heavy and Civil Engineering Construction

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