HNTB Corporation Honored for Advisor, Program Management Role on Devil’s Slide Tunnel Project

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International Tunneling Awards highlights firm’s expertise and outstanding working relationship with Caltrans

HNTB Corporation

The Devil's Slide Tunnels project in San Mateo County, Calif., represents the first road tunnels constructed by Caltrans in more than 50 years.

HNTB … ensured the client was delivered an exceptional project despite the hugely challenging technical and environmental constraints.

As part of the 2012 International Tunneling Awards, HNTB Corporation has earned the Tunneling Advisor/Program Manager of the Year Award for the Devil’s Slide Tunnel project in San Mateo County, Calif.

Winners of this year’s awards were announced at a ceremony hosted in Toronto late last year by New Civil Engineer, Ground Engineering, the International Tunneling and Underground Space Association, and the Tunneling Association of Canada. Nasri Munfah, chairman HNTB tunnel services, and Sanja Zlatanic, HNTB chief tunneling engineer, accepted the award on behalf of the firm.

“This is a tremendous honor for the firm in a competition among the industry’s best and brightest,” said Munfah. “It’s a testament not only to the talent of our professional engineers, but the outstanding working relationship we’ve developed with the California Department of Transportation.”

The $430 million project represents the first road tunnels constructed by Caltrans in more than 50 years, and when it opens to traffic next week, will be the second longest road tunnels in California. The project replaces an infamous coastal stretch of California’s State Route 1, which has been subject to lengthy closures from slipouts and rockslides, high maintenance costs and risk of permanent failure.

Among the judges’ comments: “HNTB … ensured the client was delivered an exceptional project despite the hugely challenging technical and environmental constraints.”

HNTB worked closely with Caltrans to fully explore alternative designs and construction methods for the twin tunnels. Constructed beneath San Pedro Mountain using the New Austrian Tunneling Method; each one is 29 feet, 6 inches wide by 22 feet, 4 inches high and 4,265 feet long. They are connected by ten emergency cross passages. The project lies along the active San Andreas Fault, with four inactive faults crossing the tunnels. Ten different rock masses are encountered along the tunnel alignment. Despite challenging technical and environmental constraints, HNTB successfully completed the project to the client’s satisfaction.

HNTB Corporation is an employee-owned infrastructure solutions firm serving public and private owners and construction contractors. With nearly a century of service, HNTB understands the life cycle of infrastructure and addresses clients’ most complex technical, financial and operational challenges. Professionals nationwide deliver a full range of infrastructure-related services, including award-winning planning, design, program delivery and construction management. For more information, visit http://www.hntb.com.

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