Expert Geotechnical and Geological Services

Geotechnical and geological services are a cornerstone of Gannett Fleming’s long history.

We have expertise in:

Essential to every project, our professionals can perform the exploration, analysis, and design related to soil, rock, and groundwater. Wherever geohazards occur and whatever the terrain, our geoprofessionals are experienced in a variety of geologic environments and provide solutions for geohazards.

Our focus is to advance your project goals, leveraging cutting-edge technology, ingenuity, and, in many instances, award-winning solutions. We work alongside you, from the initial site exploration through design, construction, and performance evaluation. We serve the following clients:

  • Public.
  • Private.
  • State.
  • Federal.

With a culture of safety built-in, Gannett Fleming emphasizes job safety above all else, as demonstrated by the firm’s corporate safety program. Additionally, our commitment to rigorous quality standards drives us to provide excellence on every project, every time.

Site Characterization

Ground conditions have a direct effect on the safety, resilience, and reliability of all infrastructure projects. Uncertainties can translate to:

  • Cost overruns.
  • Schedule delays.
  • Safety concerns.
  • Service interruptions.

We apply the right combination of geotechnical exploration techniques and technology to characterize sites, reduce uncertainty, and provide mitigation solutions based on accurate geotechnical information.


Geophysical methods provide an efficient means to explore subsurface conditions, allowing for the rapid evaluation of large areas without excavation or direct access to the subsurface.

Using geophysical principles and a robust inventory of in-house equipment, we help you develop a more focused drilling program with results that can limit ambiguity. Our geophysics division brings experience gained from nearly 40 years of performing geophysical and geological surveys across the country utilizing a variety of techniques, including:

  • Multichannel analysis of surface waves (MASW).
  • Ground penetrating radar (GPR).
  • Electrical resistivity imaging (ERI).


Selection of the most appropriate foundation system is critical to the constructability, life expectancy, maintenance, and long-term safety and resiliency of infrastructure projects.

Skilled in foundation alternatives and innovative ground modification techniques for complex conditions, our team understands that balancing cost with reliability is key to the success of your project. By employing the most advanced software applications to analyze, design, and observe foundation construction, we combine real-time data with the results of empirical relationships and experience to determine soil parameters and the quality of the as-built product.


The potential for environmental and safety impacts to surrounding communities resulting from the failure of earthen and concrete dams and levees is an ongoing concern for infrastructure owners. Our team, widely regarded as experts in seepage remediation, can evaluate, design, and oversee:

  • The construction of slurry wall systems.
  • Soil and rock grouting.
  • Geosynthetic liner systems.


Embankment failure caused by erosion is an ever-present concern for infrastructure owners. Whether in new designs or the rehabilitation of existing infrastructure, we specialize in mitigating external erosive forces, with a technical team skilled in embankment armoring solutions such as:

  • Soil-cement.
  • Roller-compacted concrete.
  • Riprap.
  • Articulating concrete blocks.
  • Turf reinforcement.


As authors of the USACE Grouting Technology Manual, we literally “wrote the book” on grouting technology.

Gannett Fleming is a recognized leader in the science of grouting with the development of IntelliGrout®, the industry-changing technology that enables our clients and designers to make sound engineering decisions based on vast amounts of complex data. Developed by Gannett Fleming in partnership with Advanced Construction Techniques, Ltd., IntelliGrout® revolutionized the traditional approach to grouting and is internationally recognized as the state-of-the- art system for grouting. The system provides for the comprehensive integration of real-time data collection, display, analysis, and computer control of grouting operations.

Infrastructure Evaluation and Assessment

The average age of dams and levees across the U.S. exceeds 50 years, and most were built using now-outdated design standards.

Gannett Fleming has spent more than 100 years designing, building, and inspecting dams and levees to ensure structural and operational integrity. From routine dam safety inspections to potential dam failure mode analyses, we help you make cost-effective, risk-informed decisions to meet current safety criteria.

Subsurface Explorations

We are experienced in the planning and observation of subsurface explorations ranging from simple to complex and including a variety of intrusive and non-intrusive site exploration methods. We boast a diverse team of:

  • Geotechnical engineers.
  • Geologists.
  • Hydrogeologists.
  • Geophysicists.
  • Technicians.

Where sites are known or suspected to contain contamination or hazardous materials, we provide field personnel with OSHA Hazardous Waste Operations and Emergency Response (HAZWOPER) training as necessary for working on these sites.

SPRAT-Certified Rope Access

We use specialized industrial safety equipment as the primary means of worker support. Our Society of Professional Rope Access Technicians (SPRAT)-certified rope access team provides you with a cost-effective option for safely reaching a variety of difficult-to-access sites. These sites include:

  • Dams.
  • Cliffs.
  • Rock slopes.
  • Water conveyance structures.
  • Bridges.
  • Towers.

Geotechnical Instrumentation and Modeling

Geotechnical instrumentation and modeling are important tools for evaluating changing conditions. No matter your application, we provide end-to-end instrumentation services for a wide variety of monitoring projects. Our team of instrumentation and data acquisition experts will provide key metrics to inform decisions.

Rockfall and Landslide Remediation

Slope stability and other geologic hazards affect the safety and reliability of aging and often complex infrastructure. Working with you to ensure the safe, uninterrupted service of your infrastructure, our team uses technologies such as digital photogrammetry and drones to efficiently:

  • Enhance site reconnaissance.
  • Analyze potential geologic hazards.
  • Provide mitigation solutions based on accurate geotechnical evaluations.


Are you looking for a reliable, collaborative partner? Do you have a planning, design, or construction challenge? We want to hear from you.

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Are you looking for a reliable, collaborative partner? Do you have a planning, design, or construction challenge? We want to hear from you.

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