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GTA Associates, Inc., Raleigh, North Carolina

Since expanding to the Piedmont Triangle and opening a second North Carolina location in 2015, GTA’s Raleigh office has provided geotechnical engineering, construction observation and materials testing, and environmental consulting services across the Research Triangle and surrounding areas. Drawing on our staff’s industry expertise and deep knowledge of the region’s diverse geology, we deliver client-focused, common-sense, innovative solutions for construction and development projects.

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Our Services

Construction Observation and Materials Testing Services

  • Engineering Consultation and construction consulting services
  • Mass Grading – Subgrade Soil Evaluation and Structural Fill Testing, including soil stabilization
  • Engineering Consultation for Problem Soil Conditions, including soil remediation recommendations
  • Underground Utility – Installation Observation, Trench Backfill Testing
  • Retaining Walls – Design, Inspection, Wall Backfill Testing, Construction Certification (retaining wall inspection)
  • Asphalt – Placement Observation, Density/Compaction Testing, Core Sampling, and evaluation of pavement damage
  • NCDOT-Certified Personnel – ABC Nuclear Density, QMS Density Gauge, QMS Roadway
  • Foundations – Soil Bearing Capacity Testing and 3rd Party Inspections (foundation inspection) (Commercial and Residential)
  • Retaining Wall Construction Observation and Special Inspections, Wall Materials Observation, Wall Backfill Density/Compaction Testing, Retaining Wall Soil Laboratory Testing, Retaining Wall Construction Certification
  • Chapter 17 Special Inspections – Reinforced Concrete, Structural Steel Welding and Bolting (structural steel inspection, bolting), Decking, and Light-Gauge Metal Framing
  • Concrete (Cementitious Materials) – Sampling and Testing of Freshly Mixed Concrete, Grout, and Mortar, Non-Destructive Testing (non destructive testing of concrete), and Concrete Coring (concrete inspection, compressive strength testing)
  • Floor Flatness and Floor Levelness Testing
  • Exterior Insulation Finishing System (EIFS) Observations
  • Soil and Concrete Laboratory Services – Including Moisture Content Testing, Proctor Testing, Grain-Size Analysis, Atterberg Limits, Direct-Shear, Organic Content, Unconfined Compression of Soils, Specific Gravity of Soil and Aggregate, Concrete Compressive Strength, and Flexural Strength (soil lab testing, construction materials testing)
  • Sprayed Fire-Resistive Material (SFRM) Testing (fireproofing inspection)
  • Specialty Equipment including Ground Penetrating Radar (gpr concrete inspection for post-tension cables) and Nuclear Density Gauge
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Environmental Consulting Services

  • Phase I environmental site assessment
  • Phase II environmental site assessment
  • Brownfield Services including brownfield redevelopment and vapor intrusion
  • Subsurface Evaluations and groundwater monitoring
  • Remedial Design and Implementation for soil and groundwater remediation
  • Vapor Mitigation System Designs (vapor intrusion mitigation)
  • Property Condition Assessments (property condition assessment)
  • Underground Storage Tank Removal
  • Risk-Based Closure and environmental remediation services
  • Hazardous and Non-Hazardous Materials Management
  • Natural Resource Inventory and forestry consulting support
  • Forest Stand Delineation and Conservation Plans
  • Wetland Evaluations, Delineations, Mitigation, and Permitting (wetland delineation, wetland permitting)
  • Stream Restoration and Stream Buffer Enhancement (stream mitigation)
  • FERC 7(c) Applications
  • NEPA Evaluations and environmental impact studies
  • Rare, Threatened, and Endangered Species Surveys and Consultation (endangered species survey)
  • Historic Resource/SHPO Evaluations
  • Aquifer Testing and Analysis
  • Water Supply and Wastewater Permitting Services
  • On-Site Wastewater Disposal Feasibility Evaluations
  • Nutrient and Hydraulic Loading Analysis
  • Groundwater Dewatering, Mounding, and Flow Analysis
  • Stormwater Control Measure Inspection / NPDES Stormwater Compliance (stormwater monitoring)
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Geotechnical Services

  • Geotechnical Feasibility and Due-Diligence Studies 
  • Subsurface Investigation
  • Shallow and Deep Foundation Analysis and Design for apartment building and commercial projects
  • Retaining Wall Design (retaining wall design)
  • Retaining Wall Soil Laboratory Services
  • Retaining Wall Global Stability Evaluation and slope stability analysis
  • Slope Stability Analysis/Design
  • Ground Improvement Design/Consulting/Recommendations, including soil stabilization
  • Seismic Site Classification / Seismic Analysis (seismic site class)
  • Subsidence Mitigation and sinkhole investigation
  • Geologic Hazard Mapping for soil erosion risks
  • Groundwater Control Design for high water table conditions
  • Geotechnical Instrumentation and Monitoring
  • Seepage Analysis
  • Flexible and Rigid Pavement Analysis/Design for roadways and parking lot applications
  • Geotechnical Laboratory Testing (soil laboratory testing)
  • Geotechnical In-situ Testing including Pressuremeter, Dilatometer, cone penetrometer testing, and Inclinometer
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Natural Resources Services

  • Wetland delineation and wetland permitting
  • Wetland mitigation design and monitoring
  • FERC 7(c) Applications
  • Invasive Species Management
  • Threatened and Endangered Species Surveys, Assessment, and Permitting (endangered species)
  • Biological and Ecological Assessments / environmental impact assessments
  • Tree Survey and Condition Assessments (tree survey, tree condition assessment) – ISA Certified Arborist On Staff
  • Wetland Restoration and Enhancement, including wetland mitigation and restoration
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One Glenwood Office Tower is an 11-story, 273,000-SF office tower developed on two redeveloped downtown Raleigh parcels. GTA provided comprehensive geotechnical and environmental services, including subsurface exploration and foundation design through Brownfield coordination and construction-phase testing, to address complex subsurface conditions.

Memberships & Associations

Our Team

Contact Us

530 Hinton Pond Road, Suite 104
Knightdale, NC 27545
(336) 542-0143

shawnsullivan@gtaeng.com

W. Shawn Sullivan, PE

Vice President

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With more than 600 engineers, geologists, scientists, technicians, and support personnel, GTA has the expertise, resources, and experience to meet your needs. Reach out to us today.

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