Groundbreaking Innovation

We provide innovative solutions to some of the largest, most complex tunnel, and underground construction projects in the world. Our experts are dedicated to overcoming the toughest challenges to help our customers move safely under or through any obstacle.

The Caldecott Tunnel involves the construction of a fourth bore through the Berkeley Hills, near Oakland, California. We partnered with local and state transportation officials to provide environmental documents and design services for this landmark project.

Years Of Expertise

For more than 70 years, we have planned, designed, engineered, built, and managed complex tunnel projects ranging from transit systems to sewers and pipelines, in challenging geologic environments from seismically active southern California to the alluvial littoral of the Chesapeake Bay. Our unparalleled experience includes more than 250 tunnels and ocean outfalls around the globe.

We serve the underground engineering and project/program management needs of a diverse domestic and international clientele, lending our expertise to projects such as underground utilities, water storage, and transportation tunnels, and underground buildings. We offer a host of cutting-edge tunneling techniques and technologies to minimize the risks associated with underground structures of all sizes and levels of complexity.

We help keep drinking water flowing for residents of Southern Nevada, supporting the Southern Nevada Water Authority with PM/CM services, including tunneling under Lake Mead – a project which set a world record for the highest-pressure excavation completed.

Integrated Capabilities

Our underground construction experience ranges from small excavations to large underground transit systems, water and wastewater infrastructure, and hydroelectric projects. We utilize the latest approaches, including 3D modeling, BIM, conventional and machine-bored tunneling to deliver first-of-a-kind projects and processes.

We can provide a single source of integrated capabilities for:

  • Planning
  • Tunnel and tunnel system design
  • General consulting
  • Project and construction management (PM/CM)
  • Program management
  • Geological investigations
  • Geotechnical engineering/ Geotechnical monitoring and instrumentation
  • Risk Management and Resiliency Analysis
  • Tunnel repair, inspection, and refurbishment
  • Trenchless and microtunneling
  • Seismic analyses
  • Design-build/P3
  • Construction engineering services
  • Commissioning
  • Value engineering
  • Constructability reviews

We have provided advisory services, performed subway construction, and delivered major underground infrastructure/tunneling projects, including the Southern Nevada Water Authority Lake Mead Intake 2 and 3, New York Department of Environmental Protection’s Delaware Aqueduct Bypass Tunnel, and the English Channel Tunnel. 

Project Highlight: Dubai Strategic Sewerage Tunnels – Dubai, United Arab Emirates (UAE)

The Dubai Strategic Sewerage Tunnel Project by the Dubai Municipality (DM) entails 75km of two deep wastewater tunnels, deep pump stations, and 220km of link sewers that convert Dubai from a lift station system to a full gravity system. Our scope included updates to the master plan flow forecasts, feasibility studies, preliminary design, tender preparation, program management for the detailed design consultants and design-build contractors, and construction supervision of the primary tunnels and terminal pumping stations. Read more.

We deliver innovative infrastructure that incorporates sustainability and resiliency to serve the needs of communities for years to come. As an integrated solutions provider, we are experts in alternative project delivery methods, including design-build (DB), public-private partnerships (P3s), and design-build-finance-operate-maintain (DBFOM). No matter the challenge, we do what it takes to get the job done.

We offer a host of cutting-edge tunneling techniques to minimize the risks associated with underground structures of all sizes and levels of complexity.

For the Delaware Aqueduct Bypass project in New York, our team delivered the largest repair project in the history of New York City’s water supply system, ensuring that the longest tunnel in the world could continue to deliver water to 9 million New Yorkers.

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