Dulles Metro Silver Line Phase II
Transportation
Project details
Geotechnical engineering and consulting services for the Dulles Metro Silver Line Phase II transit extension.

Innovative Engineering with Quality Service
Global Geotechnical Consultants, LLC provides geotechnical engineering, construction material testing, retaining wall design, drilling services, and environmental site assessment (Phase I and II ESA) to clients in the Mid-Atlantic region. Founded in 2012 and headquartered in Woodbridge, Virginia, it serves transportation, commercial, residential, educational, and public facility sectors.
U.S. Army Corps of Engineers - Materials Laboratory Certification · AASHTO Materials Reference Laboratory (AMRL) - Accredited · Cement and Concrete Reference Laboratory (CCRL) - Accredited
Janis Asare-BediakoPrincipal
Analyzing soil, rock, and groundwater conditions to design safe and sustainable structural supports.
Performing subsurface investigations and engineering calculations to determine soil bearing capacity.
Designing earth retention systems, including gravity walls, mechanically stabilized earth (MSE) walls, and concrete structures.
Recommending shallow and deep foundation systems tailored to site-specific subsurface profiles.
Evaluating material properties and structural elements to confirm compliance with engineering and safety specifications.
Measuring in-place soil density and moisture-density relationships to verify bearing capacity.
Conducting slump, air content, and compressive strength tests on fresh and hardened concrete.
Testing asphalt mixtures and density to verify pavement durability and compliance.
Inspecting structural steel connections, welds, and reinforced steel layouts.
Operating specialized equipment to access subsurface formations and collect critical geological samples.
Utilizing track and rubber-tired drill rigs to execute soil borings and rock coring.
Placing inclinometers and piezometers to monitor soil movement and groundwater levels.
Conducting standardized laboratory tests in an accredited facility to verify the properties of construction materials.
Classifying soils and measuring moisture-density relations, permeability, and shear strength.
Performing compressive strength, mix design, and core testing on concrete and asphalt samples.
Conducting environmental investigations to identify and mitigate potential soil or groundwater contamination.
Reviewing historical records and performing site reconnaissances to identify potential environmental liabilities.
Collecting and analyzing soil, soil vapor, and groundwater samples to confirm the presence of contamination.
Providing oversight and quality control to guide construction projects from ground break to final inspection.
Monitoring construction activities to verify adherence to design specifications and regulatory standards.
Supervising site preparation and structural installations to identify and address engineering issues in real time.
Transportation · Commercial · Residential · Education · Government
Transportation
Geotechnical engineering and consulting services for the Dulles Metro Silver Line Phase II transit extension.
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