Trihydro is an engineering and environmental consulting firm committed to providing effective solutions. We approach each project as an opportunity to partner with our clients and build trust based upon successful outcomes. With project experience extending back to 1984, our professional engineers, geologists, scientists, designers, and regulatory experts understand how to take a strategic vision, turn it into a practical plan or design, and move it through project delivery. 

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Solutions you can count on

We offer comprehensive environmental services, engineering expertise, and technology solutions.
We focus on how each provided service factors into the bigger picture, so our solutions fully integrate into our clients' overall visions.

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People you can trust

Trihydro has 500 people dedicated to service excellence. Our mid-size means
we have the expertise and manpower to provide project solutions, while still being small
enough to prioritize our individual clients' needs.

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A cultural code

Trihydro's corporate code of conduct is based on a book titled Cowboy Ethics, What Wall Street Can Learn from the Code of the West by James P. Owen. The Code of the West has 10 tenets, and in 2017, Trihydro added one more: "Leave it better than you found it." Our cultural code underpins how we approach projects, relationships, and challenges.

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moving INDUSTRIES forward

The environmental and engineering services we provide benefit multiple industries. While the types of services we offer may be similar, each industry's challenges are unique. Trihydro is committed to understanding each specific client to develop specific, fit-for-purpose solutions. 


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Featured Projects

Using Environmental Sequence Stratigraphy to Build More Accurate Conceptual Site Models

Air Force Civil Engineer Center
Ellsworth Air Force Base, South Dakota; FE Warren Air Force Base, Wyoming; Air Force Plant Peter J. Kiewit and Sons, Colorado


Trihydro completed base-wide conceptual site models (CSMs) using Environmental Sequence Stratigraphy (ESS) at three separate United States Air Force installations to support long-term remediation decisions. The installations have soil and groundwater impacts resulting primarily from per- and polyfluoroalkyl substances (PFAS) and trichloroethylene (TCE), and are regulated under the  Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA).  

To develop the CSMs, Trihydro used ESS methods to create detailed frameworks for understanding groundwater flow, contaminant source areas, preferential migration pathways, and how surface water and groundwater systems interact at each installation. ESS is an advanced geological approach for defining contaminant migration pathways, particularly in areas with complex geology and hydrogeology. ESS is centered on pattern recognition and helps identify depositional sequences and distinctive grain size distributions. ESS techniques can enhance CSMs by identifying preferential flow pathways that may or may not align with general potentiometric gradients.

To compile the data sets supporting the CSMs, Trihydro conducted a comprehensive search of existing electronic data sets via the Environmental Restoration Program Information Management System (ERPIMS) and collected hard copy reports and data from the Air Force public record, as well as other data sets and reports from local, state, and federal agencies. Trihydro then conducted fieldwork, which included collecting synoptic water level data at each installation to understand holistic groundwater flow conditions. From the data sets, Trihydro developed GIS databases for each installation for use in creating the CSMs.

Through ESS techniques, portions of previously unidentified plumes were found, and the finalized CSMs helped the client make informed decisions regarding subsequent site characterization and remediation activities. A summary of CSM work and the insights they provided at each CERCLA-identified installation follows:


Trihydro developed innovative methods to synthesize decades of lithology data from over 1,100 boreholes with varying geologic interpretation. Trihydro looked at fine-scale stratigraphic patterns in the contaminant transport pathways to predict where additional remedial solutions should be located, find portions of previously unidentified plumes, and inform subsequent site characterization and/or remediation activities.

Using simple potentiometric surface maps, the CSM showed how a PFAS groundwater plume diverged from the direction predicted. More specifically, the CSM showed how buried paleochannel structures and a subtle weathered bedrock surface controlled contaminant migration pathways. The project at Ellsworth AFB was completed under an accelerated schedule to support a follow-on contract for a PFAS remedial investigation (RI).


The groundwater impacted with PFAS and TCE lies within a complex system of sediments, eroded terraces, and recent alluvial channels, all within the exposed Ogallala Formation (the region’s major potable water supply). By examining infrastructure and applying ESS techniques, the CSM showed the need for a detailed evaluation of non-traditional contaminant pathways and how they can influence remedial strategies.

Trihydro synthesized decades of lithology data from over 675 boreholes with varying geologic interpretation. Trihydro used 3-D mapping of seasonal hydrologic gradients to show where contaminants could migrate vertically within a large water supply aquifer system. In addition, spatial-temporal evaluation of groundwater gradients showed how the different shallow aquifers interact. Typically, an upward hydraulic gradient helps prevent downward migration of potential contaminants; however, ESS determined that groundwater vertical gradients reverse seasonally in parts of the installation, and may enable dissolved contaminants to migrate downward into the Ogallala aquifer.


AFP PKJS lies within a complex suite of near-vertical, upthrown sedimentary rock sequences. The CSM showed a complex relationship between the generally upward groundwater gradients and incised drainages that cut through the upthrown rock units. Trihydro synthesized decades of lithology data from over 540 boreholes with varying geologic interpretation. Trihydro also analyzed the complex structure of the hard rock units and erosional surfaces to identify preferential pathways.

Detailed evaluation showed that portions of the drainages were discharge points for the shallow groundwater system and thus points of concern for potential TCE contaminant migration. In addition, an onsite test facility used large amounts of water to cool rocket test stands, and this water was at times discharged directly into unlined ditches where the impacted water could infiltrate directly into the subsurface or discharge directly into natural drainages. Trihydro accelerated select project deliverables to provide information for a follow-on contract supporting the EPA’s five-year review and a groundwater flow model at the Lockheed facility, immediately downgradient of AFP PJKS.

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