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Washington, D.C.
GTA provides geotechnical engineering services in Washington, D.C., combining subsurface evaluation, environmental due diligence, construction-phase testing, and natural resource considerations to support complex urban development.
4750 Wisconsin Avenue, NW
Washington, DC 20016
Phone: 202-621-82535
Office Contact
Services List
- Site work – Structural Fill Testing, Subgrade Soil, Utility Backfill Operations, and soil stabilization
- Retaining Wall Inspection, Testing and Certifications
- Asphalt Inspections and evaluation of pavement damage
- Demucking Inspections for soft soil conditions
- Firestop and Fire Penetrations (firestopping inspection)
- Foundations – Soil Bearing Capacity of Footings (foundation inspection)
- Laboratory Services, including soil lab testing
- Concrete Sampling, Slump Test (concrete inspection, compressive strength testing)
- Threshold Inspections with certified special inspectors
- Field-welded and Bolted Structures (structural steel inspection, bolting)
- Phase I and II environmental site assessments (phase 1 environmental site assessment, phase 2 environmental site assessment)
- Site-Specific Risk Assessments
- Soil site investigation and subsurface exploration
- Contaminated soil remediation and groundwater monitoring
- Brownfield redevelopment
- Consumptive Use Permits
- Dewatering Permits
- Spill, Prevention, Control, and Countermeasures (SPCC) Plans
- Spill/Release Emergency/Interim Source Removal
- Soils Management Plans
- Underground Storage Tank (UST) Removal and Closure Sampling, including underground storage tank removal
- Industrial Discharge Monitoring
- Stormwater Pollution Prevention Plans (SWPPP) and stormwater monitoring & NPDES inspections
- Environmental impact studies and support from experienced environmental consulting firms
- Geotechnical Feasibility Studies as part of geotechnical site investigation
- Subsurface exploration and soil investigation
- Shallow and Deep Foundation Analysis and Design for apartment building, high rise building, and parking lot developments
- Retaining Wall Design/Recommendations
- Slope stability analysis and design
- Ground Improvement Design/Recommendations, including soil stabilization
- Dewatering Permits
- Subsidence Mitigation and sinkhole remediation
- Karst Geology Analysis
- Groundwater Control Design for high water table conditions
- Geotechnical Instrumentation and Monitoring
- Geotechnical Laboratory Testing, including soil testing
- Wetland delineation and wetland permitting
- Wetland mitigation design and monitoring
- Threatened and Endangered Species Surveys, Assessment, and Permitting, including endangered species and rare species surveys
- Biological and Ecological Assessments / environmental impact studies
- Tree Survey and Condition Assessments, including tree survey, tree inventory, and tree condition assessment (ISA Certified Arborist On Staff)
- Wetland Restoration and Enhancement, including wetland mitigation and restoration and stream mitigation