Consulting Services for NDT & Geophysical Investigations


Olson’s NDT services can test, evaluate, image, measure, and scan almost any type of structural or infrastructure element for the purpose of constructing, maintaining, or retrofitting, and offer options for repair when concerns are identified, allowing the risk to be mitigated. Materials that can be evaluated by nondestructive methods include concrete, masonry, wood, asphalt, stone, and pipes.

Olson’s geophysical imaging services are primarily applied to engineering, environmental and ground water problems helping to determine subsurface conditions that are problematic, anomalous or unpredictable, permitting our clients to better design and minimize risk for construction, site investigation, and drilling.

Applications for NDT Methods
  • Pavements & Slabs
  • Concrete
  • Buildings & Structures
  • Bridges
  • Foundations
  • Dams and their appurtenances
  • Civil infrastructure
  • Characterize earth materials
  • Structural health monitoring
Applications for Geophysical Methods
  • Dams
  • Levees
  • Unknown foundations
  • Windfarms
  • Pipelines
  • Landfills
  • Contaminated sites
  • Karst problems
  • Exploration and resource evaluation


The benefits of NDT include complete diagnosis of visible and hidden structural material conditions with minimal or no damage along with lower cost and reduced risk for the public, owners, contractors, and engineers.

Geophysics is a non-invasive approach to image large volumes of earth materials beneath a site in one-, two- or three-dimensions (1D, 2D or 3D), and uses any existing geotechnical data to calibrate (i.e., ‘ground truth’) the results between, below and beyond drill holes.

Both NDT and geophysical testing are highly technical and interdisciplinary; therefore, at Olson Engineering, we have assembled a team of highly-educated and experienced professional engineers and geoscientists that can image and evaluate man-made structures with NDT, and characterize geologic conditions for many applications.

Contact Us to connect with our team of experts concerning your project needs. We are happy to discuss the application of appropriate methods to meet your project objectives. Olson Engineering conducts approximately 200 projects per year domestically and internationally, and we consider no job to be too large or too small.

Nondestructive Testing and Geophysical subsurface imaging allows for many applications

  • Assessing the condition of deep foundations and driven piles.
  • Characterizing unknown foundation depths and conditions.
  • Evaluating the structural integrity of buildings, bridges, and other structures.
  • Characterizing reinforcement, conduits, and concrete integrity and thickness for the purpose of retrofitting buildings, bridges, and other structures.
  • Assessing the integrity of pavements, slabs-on-grade, and the subgrade materials that support them.
  • Investigating the integrity and location of pipes, conduits, tunnels, and mineshafts.
  • Characterizing dams and spillways for retrofitting and condition assessment purposes.
  • Characterizing the subsurface for large construction and/or environmental projects.
  • Characterizing the soil and rock properties for seismic design purposes.
  • Monitoring vibrations during pile driving, construction activities near sensitive structures, and during blasting operations.
  • Site investigation for the measurement of ambient and operating vibrations for electronics and other vibration sensitive manufacturing.
  • Vibration measurement and analysis of rock crushers and other mine equipment.
  • Vibration monitoring during rehabilitation activities performed on historic structures.


Olson Engineering serves a variety of industries and client types:

Bridge Contractors

Evaluation of the integrity of both the super-structure and substructure of bridges.


Location and detection of reinforcement, pipes, and conduits in existing structures.

Water and Wastewater Facilities

Evaluation of dams, holding tanks, spillways, pipes, and tunnels for integrity and structural stability.

Environmental Contractors

Investigation of radioactive containers, clay caps used for containing municipal landfill and/or toxic materials, and detection of underground storage facilities which once contained contaminants.

Civil Engineering Contractors

Evaluation of the integrity of a wide variety of materials composing the foundations, pipelines, refineries, jetties, buildings, and bridges used for industry.

Mining Geologists and Engineers

Assessment of vast areas for geologic conditions conducive to ore body resources, definition of reserves at known mines, and assistance with mining operations/activities using shallow engineering geophysics.


Evaluation of the geologic structures and stratigraphy conducive to produce groundwater either from shallow alluvial well fields or deep bedrock aquifers

Oil & Gas Industry

Evaluation of the integrity of the materials composing their miles of pipelines, complex refineries, and massive storage facilities (above- or below-ground).

Railway Contractors

Evaluation of drilled shafts used to support railroad bridges and embankment properties, as well as slope stability to avoid shut down due to landslides or rockfall.

Geological & Geotechnical Engineering Contractors

Evaluation of the integrity of subsurface materials, either man-made (e.g., embankment dams) or natural geologic features for pipelines, embankment and concrete dams, wind farms, real-time landslide monitoring with state-of-the-art radar tools, highways & transportation corridors for maximizing public safety and minimizing risk during design, construction and/or mitigation of failures.

General Construction Contractors

Evaluation  when problems arise during construction, assessing change-of-conditions, or when mitigation of a failure is necessary.