North Bay Operations and Maintenance Facility

Location: Mare Island, San Francisco Bay

Owner: Water Emergency Transportation Authority (WETA)

Contract: $2.5 Million

Role: Subcontractor

Delivery Method: Design-Build

Result and Benefit to Client

The award-winning project was delivered safely, on time, and within budget with no harm to the San Francisco Bay.

Project Description

The WETA North Bay Operations and Maintenance Facility was a design-build project to provide critical support facilities during an emergency response in the San Francisco Bay Area.

The waterside improvements included three new full-service berths capable of accommodating maintenance and passenger service activity; and a maintenance-only berth for the ferry vessels in a configuration with two 124-ft.-long finger floats and a 200-ft.-long maintenance float. As a subcontractor to Dutra Construction, Monterey Mechanical performed all process piping for fuel, potable water, sewage disposal, urea, bilge water, lube and waste oil, and compressed air systems, and installed the HVAC system for the service float. Work included nearly one mile of dual-contained piping for various systems to support the ferry system.

Challenges | Solutions

On the $2.5 million North Bay Operations and Maintenance Facility for WETA, Monterey Mechanical was confronted with three challenges that required resolution at the onset: 1) the construction start date was delayed due to design changes, which threw off the entire schedule; 2) trade packages and design conflict analysis were inadvertently left out by the designer; and 3) the high risk of polluting the San Francisco Bay with the new pipes conveying fuel, lube oils and grease needed maximum mitigation.

To address these challenges, Monterey Mechanical added additional crews to realign the work schedule with the delivery date while increasing the safety of the work over water. We developed 3D modeling to incorporate all missing trade packages, and had pipe supports designed to reduce risks by minimizing work over the water. To capture any potential leaks into the Bay, we coordinated the development of a dual-contained hose/swivel design.

Awards and Commendations

Associated General Contractors of California

2017 Finalist for Meeting the Challenge of the Difficult Job - Projects $10 Million or Below