High quality solutions and subsurface services from our nationally accredited testing lab.

Geotechnical Engineering

Depth of Quality

According to the Geoprofessional Business Association, “Subsurface problems are a principal cause of construction delays, cost overruns, claims, and disputes. While you cannot eliminate all such risks, you can manage them.” PEC is ready to assist you in managing project risk. Since 1973, PEC has been providing geotechnical engineering services for projects including buildings, local streets, state and interstate highways, airports, bridges, transmission lines, utilities, and other types of infrastructure. PEC recognizes the benefits of digging deeper into the data we obtain from our subsurface explorations to provide you high quality, less costly construction solutions.

Empowered by our own nationally-accredited materials testing laboratory, rotary drill rigs, truck-mounted Mobile B-31 and track-mounted Mobile B-57, we are flexible and can go
through all terrains. With the ability to drill 250’ below the surface, PEC’s geotechnical team applies established technologies and testing procedures to investigate, analyze, and develop geotechnical engineering recommendations and design. PEC drilling crews have performed subsurface explorations, rock coring, and monitor well installation or abandonment throughout the region.

EvaluationListing Evaluations and Designs
  • Shallow and deep foundation design
  • Foundation soil evaluation
  • Settlement calculation
  • Embankment and slope stability analyses
  • Cut section study and rippability analyses
  • Cost effective construction solutions
  • Foundation remedial recommendations
  • Pavement design
SubsurfaceListing Subsurface Exploration
  • Soil flight auger drilling
  • Hollow stem auger drilling
  • Mud rotary
  • Rock coring

Meet the Team

Henthorne Bob PEC 2024 Grey Bob Henthorne, PG VP Geotechnical Services
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Bob Henthorne is the Vice President of Geotechnical Services. He has more than four decades of experience in the transportation industry, and most recently, was the Bureau Chief at the Kansas Department of Transportation. Bob is a dedicated Professional Geologist and has a strong track record of inspiring teams to enhance quality and productivity. He has been serving PEC and our communities since 2023.

We Deliver

PEC strives to better the communities you lead and live in.  We know when you succeed, your community succeeds. To us, that is what matters most.