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Construction & Environment

Improving the Built and Natural Environment

As infrastructure ages and climate change and human activity diminish the supply of clean water, governments, companies, and people are increasingly – and appropriately – focused on the importance of improving facilities and preserving and restoring our water resources. Protecting drinking water and the waters that flow into the oceans is our common priority.

Construction Services

Our teams have brought in-depth experience in project planning, organizing, costing and general oversight to scores of projects ranging in value from $10,000 to more than $20 million across the United States, including Puerto Rico. Customers including the U.S. Army Corps of Engineers, NAVFAC, the U.S. Fish and Wildlife Service, the Centers for Disease Control, Bureau of Indian Affairs, and the U.S. Air Force count on us to do excellent work, on time and within budget.

Sealaska Construction Groups
Well Point
Environmental Science & Remediation

Pollution threatens the health of our oceans and other critical water resources. Our environmental teams prevent the dispersal of harmful, anthropogenic contaminants into the planet’s waters and ecosystems. We also restore health to areas that have been damaged. Our data sciences experts enable digital transformation and help develop actionable insights using the latest innovations in data science and analytics.

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Marine Construction

For more than 40 years, our teams have been applying skilled problem solving to coastal engineering. Our experts have been involved with the construction and repair of piers, wharfs, docks, dolphins, walkways, gangways, intakes, and outfalls for various clients, including refineries, terminal operators, state and local agencies, and the US Coast Guard.

  • Nearshore and Port Development
  • Dredging
  • Pile Installation
  • Demolition
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Featured Projects

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Nuclear Smuggling Detection and Deterrence (NSDD)

Protecting the environment takes many forms, some unexpected. Through its Tech2 Solutions joint venture with Tetra Tech, Inc., Sealaska provides engineering, design, technology integration, international logistics and construction management support for the installation of fixed and mobile radiation detection systems and associated infrastructure. The DICCE II Contract is administered by NNSA’s Office of Nuclear Smuggling Detection and Deterrence (NSDD) (formerly referred to as the “Second Line of Defense”), whose mission is to strengthen the capabilities and commitment of U.S. partner countries to deter, detect, and interdict illicit trafficking of nuclear and other radioactive materials within the interiors of partner countries, across international borders, and through the global maritime shipping system. This U.S. government nuclear nonproliferation program provides partner countries with the tools and training necessary to counter nuclear smuggling, thus making an essential contribution to the global nuclear detection architecture.

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Columbia River Basin Projects

As climate change and human activity diminish the supply of clean water and upset the balance of our delicate ecosystems, Sealaska is eager to focus its scientific and technical skills on these threats. Both STS and SRS have a longstanding relationship with the United States Army Corps of Engineers (USACE) and have performed many projects - including freshwater resource development, ecosystem protection and renewable hydropower support - in the Columbia River Basin to assist them in their civil and environmental missions. One such project was completed recently to help the USACE Walla Walla District study the feasibility of adding an additional hydropower unit at the Dworshak Dam near Orofino, Idaho. Sealaska’s work included conducting an environmental evaluation with accompanying hydrologic, water-quality, biological, and cultural resources-impact study. The report provided to the client enabled them to determine if they could move forward with the renewable hydropower project while still being protective of valued ecological and heritage sensitivities.


Haskell Indian Nations University

Sealaska Constructors has been providing design and construction support to the Bureau of Indian Affairs at Haskell Indian Nations University in Lawrence, Kansas, since 2020. To date, we have delivered $32M in construction across more than 30 buildings and outdoor sports and recreational facilities at the university. The work has primarily been by the design-build construction method and has included demolition, new construction, exterior envelope repairs, site improvements, interior finish replacement, ADA upgrades, hazardous materials abatement, HVAC, plumbing, electrical and safety and security upgrades across the entire school. The overall campus improvements provide a healthy, comfortable learning environment for Indigenous students who attend the university.


Pearce Creek Confined Disposal Facility

After the U.S. Army Corps of Engineers identified problems with groundwater in the vicinity of the Pearce Creek Confined Disposal Facility, the Corps hired Sealaska Constructors to construct an impermeable barrier within the entire disposal site to seal its contents off from local groundwater. The project required relocating a sluice and piping, installing a temporary dike and building a new one in order to line the 300-acre site, which has received maintenance dredge sediment from Chesapeake and Delaware Canal channels along Chesapeake Bay in Maryland.

Our work, alongside subcontractors, will prevent any further impacts to the groundwater system.

Construction & Environment Leaders

Jeff Carnahan

Sr. Director

Environmental Programs

Dave Kostorowski

General Manager

Technical Services and Remediation Solutions

Dave McQueen

General Manager


Matt Swaffer


Managed Business Solutions & Cognitell

Jeff Thompson


Marine Consruction