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Geotechnical Consulting & Testing (GC&T)

Established in 1990, Geotechnical Consulting & Testing (GC&T) provides quality professional engineering services to the development and construction industry in the specialized fields of Geotechnical Engineering and Construction Materials Testing and Inspection.

GC&T has the most up to date field and laboratory testing equipment to facilitate accurate and cost effective performance of tests on soil, concrete, and reinforcing steel testing. Our laboratory facility is accredited by the Washington Area Council of Engineering Laboratories (WACEL) and U.S. Army Corps of Engineers (USACE).

For over two decades, GC&T has provided geotechnical engineering and construction material inspection and testing services on thousands of retail, residential, business park, warehouse, office, medical, educational, hospitality, places of worship and public improvement projects throughout the Washington, DC Metropolitan area.


office Building

GC&T Headquarters in Woodbridge

GC&T Laboratory in Dulles

Our staff has provided their expertise on some of Northern Virginia, Maryland and Washington, DC largest projects including:

•  Prince William/Fauquier County
    Cancer Center
•  National Institute of Health – Cancer Research     Center
•  The Secret Service Headquarters Office     Building
•  The Ronald Reagan Building (formerly known           as the Federal triangle)
•  The Navy Federal Credit Union Office Building
•  The Dulles Airport Main Terminal Expansion
•  UOSA Waste Water Treatment
•  Alexandria Waste Water Treatment Plant
•  Port Potomac (980 Homes)
•  Eagle's Point (800 homes)
•  Harbor Station (2000 homes)
•  Wayside Village (500 homes)
•  Fort Belvoir Family Housing (1800 homes)
•  South Village (400 homes)
•  Paramount Condominiums

Quality Assurance / Control

GC&T has a comprehensive in-house Quality Assurance and Quality Control(QA/QC) Program. Our instituted and implemented Quality Assurance Manual is available to our clients for their review upon request. This document focuses on quality control measures that apply during project execution ensuring our work is technically appropriate, accurate, and complete. A summary of the in-house Quality Control Program is as follows:

Our field inspectors are certified by the Washington Area Council of Engineering Laboratories (WACEL), American Concrete Institute (ACI), and/or the Virginia Department of Transportation (VDOT) in Soils, Concrete or Asphalt.  The field inspectors work directly under the supervision of registered professional engineers. 

The inspectors, who perform soil compaction testing utilizing a “Nuclear” gauge, must attend an eight (8) hour Nuclear Gauge and Radiation Safety Training seminar. Each inspector, when employed, spends a minimum of 40 hours in training offered in-house to become familiar with the company policies and procedures. 

All our field staff is interconnected to a telecommunications network that keeps them in continuous contact with our project engineers.  At least one engineer is present in the office at all times when inspectors are working in the field to provide assistance and to answer questions if required.  

Our engineering and testing services are supported by an accredited in-house materials laboratory that enables us to efficiently perform the tests necessary to analyze the different construction materials and establish their engineering properties.  Our laboratory facility is inspected by the AASHTO Materials Reference Laboratory (AMRL) and the Cement and Concrete Reference Laboratory (CCRL) of The National Institute of Standards and Technology and WACEL at regular intervals to review our testing and inspections procedures.