Groundbreaking Innovation

We offer 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 customers move safely under or through any obstacle.

The Caldecott Tunnel involved 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 over 70 years, we’ve planned, designed, engineered, built, and managed complex tunnels from transit to sewers and pipelines. Many of these projects involve challenging geologic environments, from seismically active Southern California to the Chesapeake Bay’s alluvial littoral. Our unparalleled experience includes over 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. Our expertise is utilized on projects such as underground utilities, water storage, transportation tunnels, and underground buildings. We offer a host of cutting-edge tunneling techniques and technologies to minimize risks associated with underground structures of all complexities.

We help keep drinking water flowing for residents of Southern Nevada, supporting the Southern Nevada Water Authority with project management/construction management (PM/CM) services. This includes 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, building information modeling (BIM), and conventional and machine-bored tunneling to deliver first-of-a-kind projects and processes.

We can provide a single source of integrated capabilities for the following:

  • Planning
  • Tunnel and tunnel system design
  • General consulting
  • Project management/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/public-private partnership
  • Construction engineering services
  • Commissioning
  • Value engineering
  • Constructability reviews

We’ve 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, the 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 Municipality is working on the Dubai Strategic Sewerage Tunnel project, which entails 75 kilometers of two deep wastewater tunnels, deep pump stations, and 220 kilometers of link sewers. This converts 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, and tender preparation. 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’re experts in alternative project delivery methods. This includes 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 risks associated with underground structures of all complexities.

Delaware Aqueduct Bypass tunnel project
We delivered the largest repair project ever in New York City’s water supply system for the state’s Delaware Aqueduct Bypass. This ensured that the longest tunnel in the world could continue to deliver water to 9 million New Yorkers.

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