Geotechnical Engineering

GeoPentech’s engineers and scientists have consulted on geotechnical projects for over four decades. The firm’s experience extends to all aspects of planning, design, and construction, and includes a variety of facilities ranging from buildings, reservoirs, dams, tunnels, pipelines, bridges, and roadways.

GeoPentech continuously contributes to the advancement of geotechnical and geosciences practices through the integrated nature of the firm’s specialties.


GeoPentech’s geoscientists assess geologic hazards and ground performance with a multitude of methods. Our team gathers and evaluates geologic data for projects ranging from mid and high-rise buildings to mines, dams, and tunnels.

Our geologic data collection experience includes:

  • Surface mapping of geologic units and structures
  • Aerial photographic interpretation of geomorphology
  • Collection and interpretation of subsurface geologic units through a full range of direct and indirect drilling and down-hole testing methods
  • Stratigraphic interpretation of geophysical data
  • Geologic mapping of underground shafts and tunnels during construction

Geologic data and laboratory test results of earth materials are used to assess geologic hazards such as faults and earthquakes, landslides, mudflows, debris flows, rock fall, ground settlement, subsidence, sinkholes, liquefaction, and shoreline and river channel erosion. Our team also analyzes data to estimate ground performance during and after construction for client projects and recommend cost-effective mitigation measures as necessary.


GeoPentech have provided non-invasive geophysical services in support of a wide variety of project needs. We have used our geophysical services to characterize soil, rock, and groundwater conditions; evaluate active faults, landslides, and other geologic structures; characterize a site for seismic hazard analyses; monitor and assess effects due to construction vibrations; and locate subsurface voids, buried metal well heads, and underground utilities. GeoPentech owns and maintains several geophysical systems for rapid deployment into the field.

Our geophysical capabilities includes:

  • P- and S-wave seismic methods (e.g. downhole seismic testing, refraction, and reflection)
  • Surface-wave seismic methods (e.g. MASW and ReMi)
  • Construction vibration monitoring and evaluation
  • Ground penetrating radar (GPR)
  • Electrical resistivity, electromagnetic, and magnetic methods

GeoPentech plans and implements groundwater investigation programs to characterize hydrogeology for developing groundwater management programs, groundwater supply and for assessing groundwater control measures for deep excavations and underground structures.

GeoPentech also develops groundwater and surface water monitoring programs to document and evaluate the hydrologic response for planned aquifer management activities, underground construction and water supply extractions and to support environmental programs and permitting.

GeoPentech routinely develops flow models to evaluate and predict the groundwater system response to planned groundwater management programs, seepage from dams and levees and groundwater control for deep excavations and underground construction. GeoPentech has also provided input on impacts to groundwater and surface water supply from hazardous chemical and biological wastes and from waste disposal facilities.

Earthquake Engineering

For several decades, GeoPentech’s engineers and scientists have provided earthquake engineering consulting services for projects around the world including tall buildings, towers, tunnels, dams and nuclear power plants.

 Earthquake engineering services include:

  • Ground motion evaluation
  • Seismic hazard assessment
  • Liquefaction evaluation and mitigation
  • Advanced numerical modeling and analysis
  • Slope stability
  • Landslide evaluation and repair
  • Soil structure interaction studies

GeoPentech continues to advance the state of our geoengineering and geosciences practice by actively contributing to industry and academic efforts.

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