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Our underground experts like the fact that there’s nothing straightforward about building a tunnel. From the moment we begin exploring a proposed tunneling project, they are searching out the unique challenges and addressing how they can be overcome, safely and within budget and schedule. We have built a team that offers expertise in the field in drill and blast, hard rock TBM, and EPB construction and in work that requires slurry TBM or NATM adaptability. We build and manage projects under densely populated urban streets and remote mountainsides, in close proximity to operating systems and at the base of crashing waterfalls. Nearly all of our projects offer limited accessibility, which is just one aspect of the many challenges. Our experts Take a look at what we’ve been working on underground.

Lake Mead Intake No. 3 Low Lake Level Pumping Station (L3PS) (Tunnels)

The L3PS Project will provide a means to move water from a new intake at the bottom of Lake Mead to consumers in the Las Vegas area.

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Silicon Valley Clean Water Gravity Pipeline Project

With Silicon Valley Clean Water’s (SVCW’s) conveyance system experiencing three times more pressure than it was designed for, Barnard Bessac JV is providing Early Contractor Involvement to assist in the Progressive Design-Build of a new gravity pipeline.

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Third Street Light Rail Program, Phase II – Central Subway Tunnel

At the Central Subway Tunnel Project in the heart of San Francisco, the San Francisco Municipal Transportation Agency (SFMTA) set out to improve transit options for a densely populated neighborhood known for high public transportation ridership while also furthering business development along the new 1.7-mile rail line.

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Blue Lake Expansion Project (Tunnels)

The City and Borough of Sitka recently said goodbye to dependence on imported diesel fuel with the raising of the Blue Lake Dam.

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Eisenhower / Johnson Memorial Tunnels Fixed Fire Suppression System Design-Build Project (Tunnels)

Following the example set by highway departments in Europe and Australia, the Colorado Department of Transportation (CDOT) sought a system that would provide the greatest flexibility in suppressing different types of fires and best protect the public traveling through the Eisenhower Johnson Memorial Tunnels.

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Ellis Avenue Trunk Sewer

The Orange County Sanitation District needed to upgrade its sewer line, yet did not want to inconvenience area commuters by closing one of the area’s busiest thoroughfares, so they hired our Barnard Soletanche Team to construct 1.1 miles of tunnel through extremely challenging soils.

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