• City of Atlanta Water Supply Program

    Providing water sustainability for the next 100 years.

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  • Metro Crenshaw/LAX Corridor Extension

    Making critical connections to keep Los Angeles moving forward

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  • Ottawa Combined Sewage Storage Tunnel

    Digging in against combined sewer overflows.

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Creating tunnels without tunnel vision

With a promise to design with community in mind, we focus on risk avoidance and mitigation with robust management programs that maximize constructability to deliver solutions that provide the best overall value to you. Read More

No matter what challenges you face, it will work in the end.

Dave Krywiak Principal, Tunneling and Trenchless Specialist
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One of the most challenging tunneling projects in the world

Approximately 90% of the drinking water delivered to customers in southern Nevada comes from the Colorado River, which is captured at Lake Mead. Construction of this new intake ensures that full system capacity can be maintained at low lake levels. The $520M project consisted of a 600-foot deep intake, new 900 MGD pumping station, and 3 miles of up to 20-foot inside diameter water supply tunnel. Read More

Connecting a community while maintaining daily train traffic

Fossil Creek Trail is a set of two separate paved pathways, totaling 5.3 miles, running through neighborhoods and local parks that the City of Fort Collins is working on connecting. Complicating this effort is an existing Burlington Northern Santa Fe Railroad system—a main freight corridor along Colorado’s Front Range. We worked with the city on a solution that maintained the daily train traffic by using a below grade tunnel rather than a more traditional crossing. Read More

Providing $50M in savings with cavern style pump station

This deep tunnel pump station is designed to dewater 160 MG of stored CSO flow in a 24 hour period. The pump station is 240 feet below ground, housed in an underground cavern that is 35 feet lower than the nearby tunnel storage system. The cavern is approximately 140 feet long, 56 feet wide, and 65 feet high. Read More
We are built for the tunnel ahead

We've worked on over 700 tunneling.trenchless projects in the last five years.
Ranked second in the top 50 trenchless design firms
Over 500 of our staff have specialized tunneling experience.
Expert Spotlight

Anil Dean, Tunnels and Trenchless Practice Leader

The interaction of value, project needs, and the ground makes for great variety and no two projects are ever the same.
Anil Dean Tunnels and Trenchless Practice Leader Read More

Michael Bruen, Deputy Practice Leader, Water

Every project is an opportunity to mentor the future leaders of our profession in designing practical solutions that manage risk and cost.
Michael Bruen Deputy Practice Leader, Water Read More

Nick Cioffredi, Senior Principal, Transportation

You’d be amazed how many bridges you drive over on a daily basis and don’t realize that you’re on a bridge. My job out there is to keep our neighbors and communities safe.
Nick Cioffredi Senior Principal, Transportation Read More

Steve Fradkin, Tunneling Technology Manager

Although the work and results are generally unseen, the results of my work benefit everyone.
Steve Fradkin Tunneling Technology Manager Read More

Dana Rogers, Senior Project Manager

The goal is to meet project costs and scheduling goals while maintaining safety on every project.

Anil Dean

Tunnels and Trenchless Practice Leader

Michael Bruen

Deputy Practice Leader, Water

Nick Cioffredi

Senior Principal, Transportation

Steve Fradkin

Tunneling Technology Manager

Dana Rogers

Senior Project Manager

Related Services

Environmental Services With 3,100 environmental staff in 20 specialties, we know what to do. When we’re gathering data to permit a new project or collaborating on a plan to remediate an old one, our passion for science drives us.
Geotechnical Engineering & Materials Testing Our geotechnical engineers and material specialists are focused on solving complex design, construction, and rehabilitation issues impacting the communities where we live and work.
Transportation Services Working within the context of the communities we serve, we provide planning, engineering, and infrastructure management services that fit the needs of our clients and improve the overall traveler experience.
Trenchless Our expertise in trenchless technologies lets you build, maintain, or replace pipes while minimizing surface disruption.
Water Services Through the life cycle of capture, use, reuse, and discharge, our team works to optimize every facet of a water system

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