GFA International brings decades of experience providing expert geotechnical solutions to complex projects of all sizes, whether public or private. The technical expertise of our team, our specialized training, our fleet of equipment and wide scope of capabilities has assisted our clients in finding solutions to difficult and complex challenges on a variety of projects.

GFA’s geotechnical engineers and geologists are skilled in defining and executing field exploration programs to provide cost-effective solutions to geotechnical challenges. Our goal is to provide practical design recommendations for safe and stable structures, and oftentimes we are able to recommend innovative options for your project. Our unique approach of field engineering reconnaissance and test drilling observation provides a high degree of confidence that subsurface anomalies are identified on the front end of a project. This gives our clients better preparation at the time of construction.

GFA owns and operates one of the largest and most diverse fleets of drilling equipment in the state. By owning, operating and maintaining our own equipment, we can deliver the highest quality product in a more cost-effective and timely manner by eliminating unnecessary subcontractor costs and delays. Our fleet includes track and truck-mounted equipment and limited access rigs for tight spaces, low overhead conditions, and over-water work allowing us to access almost any drill site. In addition to direct push and conventional drilling, GFA also offers Sonic drilling services. Sonic drilling is renowned for its high-quality samples, drilling speed, and capacity compared to rig weight, size and costs. Another advantage of Sonic drilling is that there are virtually no soil and water spoils that may otherwise need to be disposed of when drilling on environmentally impacted sites, thus saving thousands of dollars for our clients. Our drill crews are experienced in handling a wide range of geologic situations in a variety of settings; their drilling experience combined with state-of-the-art technological capabilities means we successfully complete jobs even under the most difficult drilling conditions.

Our geotechnical team is driven by the importance of on-time, quality reports that are reviewed by senior engineers and geologists to make certain that solid engineering and valued recommendations are provided to our customers.

GFA can provide the following geotechnical services:

Geologic / Hydrogeological

Geotechnical Subsurface Explorations
     • Preliminary and Site Reconnaissance
     • Subsurface Soil Investigations
     • Foundation Design and Recommendations
     • Soil Improvement/Modification Techniques
Slope Stability Analysis
Slurry Wall Verification Drilling
Monitoring Well Installation
Recovery Well Installation
Vacuum Extraction Well Installation
Environmental Drilling
Sinkhole Studies
Geotechnical Forensic Engineering
Subcontract Drilling Services

Geotechnical Drilling/Sampling and Testing

Test Pits
Auger Borings
Wash Borings
Rock Cores
Muck Probes
Cone Penetration Tests (CPT)
Standard Penetration Tests (SPT)
Plate Load Test (PLT)
Permeability Test
Consolidation Test
Shear Strength Test
Shelby Tube/Split Spoon
Double Ring Infiltrometer Tests
Exfiltration Tests (FDOT and SFWMD)
Infiltration Tests (FDOT and SFWMD)

Sitework Monitoring and Earthwork Observation

Pile Installation & Load Tests
Pile Driving Analyzer (PDA)
Vibratory Compaction & Vibration Monitoring

Geophysical Services

Pre and Post Construction Surveys
Ground Penetrating Radar (GPR)
Seismic Monitoring
Geologic Mapping
Crosshole Sonic Logging

Beach Renourishment Quality Control

Turbidity Monitoring
Vibration Monitoring
Existing Building Structural Surveys
Laboratory Testing (for grain size)
Munsel Color
Carbonate Content