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Geo-Technology Associates, Inc., Raleigh, NC

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 (COT/CMT)

  • Mass Grading – Subgrade Soil Evaluation and Structural Fill Testing
  • Engineering Consultation for Problem Soil Conditions, Soil Remediation/Repair Recommendations
  • Underground Utility – Installation Observation, Trench Backfill Testing
  • Retaining Walls – Design, Inspection, Wall Backfill Testing, Construction Certification
  • Asphalt – Placement Observation, Density/Compaction Testing, Core Sampling
  • NCDOT-Certified Personnel – ABC Nuclear Density, QMS Density Gauge, QMS Roadway
  • Foundations – Soil Bearing Capacity Testing and 3rd Party Inspections (Commercial and Residential)
  • Retaining Wall Construction Observation and Special Inspections, Wall Materials (Block Type/Size, Geogrid Type/Strength, Drainage Stone, etc.) 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, Decking, and Light-Gauge Metal Framing
  • Concrete (Cementitious Materials) – Sampling and Testing of Freshly Mixed Concrete, Grout, and Mortar, Non-Destructive Testing, and Concrete Coring
  • Floor Flatness and Floor Levelness Testing
  • Exterior Insulation Finishing System (EIFS) Observations
  • Soil and Concrete Laboratory Services – Including but Not Limited to Moisture Content Testing, Moisture-Density Relationship (Proctor) Testing, Grain-Size Analysis, Atterberg Limits, Direct-Shear, Organic Content, Unconfined Compression of Soils, Specific Gravity of Soil and Aggregate, Concrete Compressive Strength (Cylinders), and Flexural Strength (Beams)
  • Sprayed Fire-Resistive Material (SFRM) Testing
  • Specialty Equipment (Ground Penetrating Radar [GPR], Windsor Probe, Floor Flatness/Floor Levelness Test Equipment, Kessler Dynamic Cone Penetrometer, Wildcat Dynamic Cone Penetrometer, Moasure [Motion-Based Measurement Tool], Nuclear Density Gauge [Soil and Aggregate], Thin-Lift Nuclear Density Gauge [Asphalt])
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Environmental Consulting Services

  • Phase I and Phase II Environmental Site Assessments
  • Brownfield Services (Including Phase I & II Assessment, Asbestos, Mold, Lead-Based Paint, Wetland, and Vapor Intrusion Evaluations, Brownfield Eligibility Submittal, Brownfield Agreement Consulting, Environmental Action Plan Consulting/Preparation, Environmental Management Plan Consulting/Preparation, Brownfield Cleanup, Annual Monitoring, etc.)
  • Subsurface Evaluations & Groundwater Monitoring
  • Remedial Design and Implementation
  • Vapor Mitigation System Designs
  • Property Condition Assessments
  • Storage Tank Closures
  • Risk-Based Closure
  • Hazardous and Non-Hazardous Materials Management
  • Natural Resource Inventory
  • Forest Stand Delineation & Conservation Plans
  • Wetland Evaluations, Delineations, Mitigation & Permitting
  • Stream Restoration and Stream Buffer Enhancement
  • FERC 7(c) Applications
  • NEPA Evaluations
  • Rare, Threatened, and Endangered Species Surveys and Consultation
  • Historic Resource/SHPO Evaluations
  • Aquifer Testing & Analysis
  • Water Supply and Wastewater Permitting Services
  • On-Site Wastewater Disposal Feasibility Evaluations 
  • Nutrient and Hydraulic Loading Analysis
  • Groundwater Dewatering/Mounding/Flow Analysis
  • Stormwater Control Measure Inspection / NPDES Stormwater Compliance
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Geotechnical Services

  • Geotechnical Feasibility and Due-Diligence Studies
  • Subsurface Exploration
  • Shallow and Deep Foundation Analysis and Design
  • Retaining Wall Design
  • Retaining Wall Soil Laboratory Services
  • Retaining Wall Global Stability Evaluation 
  • Slope Stability Analysis/Design
  • Ground Improvement Design/Consulting/Recommendations
  • Seismic Site Classification / Seismic Analysis 
  • Subsidence Mitigation
  • Geologic Hazard Mapping
  • Groundwater Control Design
  • Geotechnical Instrumentation and Monitoring
  • Seepage Analysis
  • Flexible and Rigid Pavement Analysis/Design
  • Geotechnical Laboratory Testing
  • Geotechnical In-situ Testing (Pressuremeter [PMT], Dilatometer [DMT], Cone Penetration Testing [CPT], Inclinometer, Bore-hole Shear Test.
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Natural Resources Services

  • Wetland Delineation and Permitting 
  • Wetland Mitigation Design and Monitoring 
  • FERC 7(c) Applications
  • Invasive Species Management
  • Threatened and Endangered Species Surveys, Assessment, and Permitting 
  • Biological and Ecological Assessments/Environmental Impact Assessments 
  • Tree Survey and Condition Assessments – ISA Certified Arborist On Staff
  • Wetland Restoration and Enhancement
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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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