Geotechnical, Environmental & Materials Engineering

Geotechnical Testing & Inspections (GTI) is an environmental, geotechnical and materials engineering consulting firm composed of engineers, geologists, scientists and technicians. Services are provided regionally, nationally and internationally with headquarters in Scottsdale, Arizona. We also have full service offices in Guadalajara, Mexico and Mexico City, Mexico.


GTI has been certified by AMRL, CCRL, the City of Phoenix, AASHTO and ADOT. Field Technicians with GTI are certified with the Arizona Technical Testings Institute (ATTI), American Concrete Institute (ACI), City of Phoenix and ADOT to conduct soils, concrete and asphalt testing. We also have certified personnel on the Slab-on-Ground Committee of the Post-Tensioning Institute (PTI). GTI is also a nationally recognized Women Owned Business and an ADOT Disadvantaged Small Business.


GTI is committed to the principles of client service, responsiveness and sound practical professional advice. Throughout our history, we pride ourselves on providing high quality engineering services and on developing the most cost effective and innovative solutions that address the needs of our clients.

Over 40 Years of Experience

We are registered professional engineers in more than 26 states and are available to service all your engineering needs. The key members of the firm have worked in the western United States for over 40 years and have gained national and international recognition for their ability to find innovative and cost saving solutions to difficult geotechnical, environmental and construction materials and testing projects.

In the past 17 years, GTI has become a recognized expert in various aspects of the development and engineering industry. GTI is able to provide professional engineering services to our clients across the United States and Internationally. The key members of the firm have provided a wide range of services from feasibility studies through design and construction.

Schedule An Inspection

Schedule an inspection:

GTI appreciates the opportunity to provide you with your testing needs. GTI will do everything in our power to meet your scheduling needs.

Schedule An Inspection
Request A Proposal

Request a proposal:

GTI appreciates the opportunity to provide a proposal on your upcoming project. GTI will prepare a formal proposal for your review within 24 hours of receipt.

Request A Proposal

A partial list of services include:

  • Geotechnical Subsurface Explorations
  • Phase I Environmental Site Assessments
  • Phase II Site Characterizations Studies
  • Phase III Site Remediation Services
  • Seismic Refraction Surveys
  • Foundation Integrity Evaluations
  • Archeological & Biological Studies
  • Special Foundation Analysis & Design
  • Foundation Design Service
  • Post Tensioned Slab Recommendations
  • Special Inspection Services
  • Materials Engineering & Testing Services
  • Foundations Integrity Evaluations
  • Forensic Investigations
  • Retaining Wall & Foundation Recommendations
  • NEPA Checklist and Full NEPA & SHPO Services
  • Pile Integrity Testing
  • Cross-Hole Sonic Logging
  • Percolation Testing
  • Clegg Impact Testing
  • Vibration Studies
  • Slope Stability Evaluataions

Take a look at what GTI is doing with their private drone!

The GTI, FAA licensed drone is capable of obtaining clear view aerial videos and photographs of our projects.

This provides a much clearer view of the property and helps identify any areas of concern for environmental, geotechnical and/or materials testing projects.

Learn More About GTI’s Drone
Contact Us Today!

GTI is prepared to meet all your engineering needs

by performing high quality work in a timely and cost effective manner, specific to your projects needs.

Contact us today for more details on our services and tell us about your project needs.

Contact Us Today!

Our Certifications