With hundreds of geotechnical engineers, soils technicians, and drillers on staff, Tetra Tech is one of the largest firms based in North America, providing geotechnical solutions worldwide. We use state-of-practice techniques and test procedures to investigate, analyze, and develop geotechnical engineering recommendations and designs for simple to complex problems relating to groundwater, soil, or rock.


  • Onshore and offshore site investigations
  • Foundation investigations and design
  • Geohydrology
  • Permafrost engineering and geothermal analysis
  • Geologic hazard identification
  • Rock cut and tunnel design
  • Avalanche and rockfall evaluations
  • Seismic hazard evaluations and earthquake engineering
  • Assessment and design of earth and rock fill dams
  • Sedimentation control studies
  • Engineering risk assessment
  • Slope stability analysis
  • Slope remediation and reclamation
  • Granular resource evaluations
  • Dewatering and seepage analysis
  • Geotechnical laboratory testing
  • Contaminated land investigation, risk assessments, remedial works design, and validation
  • Corridor route evaluations for roads, railways, and pipelines
  • Design of road, railway, and airstrip embankments
  • Soil-pipe interaction design guidance for pipelines and hydrocarbon well casings
  • Waste facilities design
  • Construction quality assurance
  • Construction material evaluations
  • Value engineering to optimize design
  • Expert witness services

Tetra Tech’s geotechnical engineering team complements specialized expertise with knowledge of local and regional regulations and conditions. Learn more about our services:

Related Projects

See more
The Causeway heading into Auckland

The State Highway 16 Causeway Upgrade

Providing innovative and cost-effective ground improvement strategies to overcome deep and soft soil challenges on the SH16 Causeway upgrade

Mainline trains using the constructed reinforced soil ramps.

Reading Station Elevated Railway

Designing reinforced soil retaining walls and a load transfer platform at the United Kingdom’s busiest railway interchange outside London

Bridge abutment under construction

M50 Phase 1 Motor Way Upgrade in Dublin, Ireland

Providing value engineering services to help save more than £5M for a complex motorway junction

The float out units for the tunnel sections.

Limerick Immersed Tube Tunnel, Ireland

Designing the geotechnical temporary works to support excavations for cut and cover sections of a road tunnel under a river

Sri Lanka

Badulla, Haliela, and Ella Integrated Water Supply Project, Sri Lanka

Providing engineering, procurement, and construction services for new, integrated potable water facilities, from source through distribution