Service Overview

A project’s foundation is key to its resiliency.  Our experienced geotechnical engineers, geologists, and drillers have executed thousands of evaluations throughout the region, enabling us to accurately understand your site’s geology.  

Our collaborative approach among multi-disciplinary experts and investment in innovative tools and technology allows us to discover, address, and deliver recommendations that ensure project cost-savings during design and construction.  

Transportation Services

Transportation geotechnical engineering is at the core of our department, and we have been serving on projects that have shaped, improved, and redefined how communities connect.

Summit has provided geotechnical services for the NC Department of Transportation for over thirteen years and continues to foster our relationship and expand our services with the Department. Summit provides the engineering and support personnel to ensure that the Department’s expectations are met for geotechnical engineering field investigations, inventory preparation, recommendations, and foundation design services. Summit has a qualified staff of professional geotechnical engineers, professional geologists, CADD operators, and drilling personnel, as well as laboratory and field equipment. Through our experience and capabilities, we will provide timely and credible geotechnical engineering solutions for NCDOT and other state’s departments of transportation.

Private Client Services

The beginning stages of a project are crucial for maintaining timelines and budget, and our team understands the importance of providing accurate evaluations and estimates the first time. 

Our diverse geotechnical skillset can adapt to a wide variety of project types. We work efficiently, address challenges proactively, and communicate constantly with all stakeholders to keep your project on track.  

Drilling Services

Summit’s drilling staff has a vast amount of experience, drilling in all regions of the Carolinas and Virginia.  We are well versed at deep, mud-rotary drilling in the Coastal Plain, to auguring and rock coring in the Piedmont Region and the Mountains.  Our drillings staff has experience drilling on and off road, in varied topography and terrains. 


  • Subsurface Drilling & Evaluations
  • Roadway Foundation Design & Investigation
  • Structure Foundation Design & Investigation
  • Retaining Wall Design & Investigation
  • Pavement Design Investigation
  • Ground Improvement Design
  • Slope Stability Analysis
  • Soil Test Boring
  • Strength of Subgrades
  • Dam Investigation, Evaluation & Design
  • Current Conditions Assessments
  • Verification of Soils
  • Phase I Environmental Site Assessments

Our Team Has the Experience

Our experienced team of engineers, geologists and drillers will uncover everything you need to get your project off the ground. With three drill rigs in-house and a staff that has experience from thousands of geotechnical investigations across the region, we can mobilize a professional team and the most appropriate rig to your site. Our accessibility will be your asset, as will our two state-of-the-art, AASHTO and CCRL certified testing labs. Soil is our forte, and we are up to any challenge, no matter what type you’re trying to build on.


Combined Years of Geotechnical Engineering Experience


Combined Years of Drilling Experience

Technical Capabilities

We possess the technology to support any or all of the projects the County needs. Our Geotechnical Department has three individual rigs and teams ready to mobilize, and the following equipment to use at your request:

  • Drilling Rig (CME 450)
  • Drilling Rig (CME 550x)
  • Drilling Rig (D-50)
  • Hollow stem drilling equipment
  • Mud-rotary drilling
  • Rock coring
  • Shelby tubes
  • Piezometers
  • Boring hole plugs and grouts

Methods, Approach, and Controls

Field Exploration Planning

Our team will review readily available geotechnical and geologic maps and literature covering the site from a geotechnical standpoint. We will mark locations of proposed borings and notify NC One-Call to locate utilities in public areas along the streets.

Subsurface Evals & Field Work

For subsurface exploration, our team will perform preliminary borings and one soil test boring within the building footprint that will be advanced down to 100′ or until rock refusal, whichever occurs first, for seismic classification.

Subsurface Report

Our subsurface report will include but is not limited to, a vicinity map and site plan showing the boring locations, boring logs, foundation recommendations, soil determinations, slab-on-grade recommendations, and discussion of general subsurface conditions.

Service Contact

Jeff Elliott, PE

CMT/SI & Geotechnical Engineering Department Manager

320 Executive Court, Hillsborough, NC 27278

Brad Worley, PG

Senior Geologist/Drilling Manager

1110 Navaho Drive, Suite 600, Raleigh, NC 27609