Geotechnical Engineering

Our company-owned drill rigs and full-service testing laboratories serve a full range of geotechnical and soil testing needs.


In the construction industry, uncertainty always costs money. Unforeseen or unexpected conditions translate to higher design costs, higher construction bids, construction delays, change orders, and potentially unsuccessful projects. Therefore, it’s critical to know and understand the subsurface conditions of a project site long before the construction phase begins.

Using a variety of techniques, the EST team conducts comprehensive subsurface investigations to characterize soil, groundwater, geologic, and seismic conditions and deliver practical solutions to subsurface challenges. Our professional engineers, licensed drillers, and certified laboratory technicians are equipped with company-owned drill rigs and full-service testing laboratories in order to serve a full range of geotechnical and soil testing needs.

Key Services

Subsurface Exploration

  • Auger Drilling
  • Rotary Mud Drilling
  • Rock Coring


In-Situ Testing

  • Standard Penetration Test (SPT)
  • Texas Cone Penetrometer (TCP)
  • Cone Penetrometer Test (CPT)
  • Falling Weight Deflectometer (FWD)
  • Shelby Tube Sampling
  • Field Soil Resistivity – Wenner Four Electrode Method


Advanced Laboratory Testing

  • Resilient Modulus (MR)
  • California Bearing Ratio (CBR)
  • Consolidation/Swell Tests
  • Isotropically Consolidated Undrained Triaxial Compression (CIUC)
  • Soil Permeability
  • Soil Dispersion Testing


Foundation Analysis and Design

  • Deep Foundations (Piles and Piers)
  • Shallow Foundations


Earth Structure, Slope Stability Analysis,
Retaining Wall Analysis, and Design

  • Soil Nail Walls
  • MSE Walls
  • Cantilever Walls


Soil Stabilization and Ground Improvement

  • Building Pad Preparation
  • Pavement Subgrade Improvement Additional Services
  • Pavement Design and Subgrade Evaluation
  • Soil Corrosion Potential Analysis and Cement Type Recommendations
  • Lagoon Liner Soil-Bentonite Mix Designs
  • Seismic Site Classification
  • Groundwater Monitoring/Monitoring Well Installation

Contact Us

Corporate Headquarters

615 N Hudson Avenue, Suite 300 Oklahoma City, OK 73102

(405) 815-3600

(405) 815-4080