With hundreds of geotechnical engineers, soils technicians, and drillers on staff, Tetra Tech is a leader in geotechnical engineering in North America. We use state-of-practice techniques and test procedures to investigate, analyze, and develop geotechnical engineering recommendations and designs for simple and complex groundwater, soil, and rock challenges.

Our services include:


  • Onshore and offshore site investigations using cone penetration test (CPT), standard penetration test (SPT), large penetration test (LPT), dynamic cone penetration test (DCPT), and rotary sonic
  • Hydrogeological investigations and permeability testing
  • Geologic hazard identification
  • Avalanche and rockfall evaluations
  • Granular resource evaluations
  • Geotechnical laboratory testing
  • Borrow material investigation and evaluations
  • Geotechnical instrumentation
  • Geomechanical assessment of caprock formation strength (using high-pressure triaxial test)
  • Air photo interpretation
  • Ground reconnaissance and terrain assessment and surficial geology mapping
  • Geophysical investigations (onshore, offshore, and downhole)
  • GIS mapping and analysis of LiDAR and satellite imagery
  • Rock mass classification and property assessment


  • Permafrost engineering and geothermal analysis
  • Seismic hazard evaluations and earthquake engineering
  • Sedimentation control studies
  • Engineering risk assessment
  • Slope stability analysis
  • Dewatering and seepage analysis
  • Corridor route evaluations for roads, railways, and pipelines
  • Site geotechnical feasibility analysis
  • Dam safety geotechnical review
  • Acid rock drainage and metal leaching prediction and assessment
  • Liquefaction triggering assessment
  • Earthquake-induced lateral spreading assessments
  • Settlement estimation
  • Numerical modelling (FLAC, UDEC, PLAXIS, and GEMCOM)
  • Free-field seismic and soil-structure interaction analysis


  • Foundation designs (deep, shallow, and dynamic)
  • Rock cut and tunnel design
  • Assessment and design of earth- and rock-fill dams
  • Slope remediation and reclamation design
  • Design of road, railway, and airstrip embankments
  • Soil-pipe-interaction design guidance for pipelines and hydrocarbon well casings
  • Waste facilities design
  • Erosion protection for stabilization measures
  • Geotechnical design of mechanically stabilized earth (MSE), gravity, and cantilever retaining walls and shoring systems
  • Blast design and overbreak and underbreak mapping and evaluation
  • Ground improvement design
  • Trenchless technology