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- Envisioneering, Inc.
Alexandria, King George, Virginia Beach
- ERM Group, Inc.
Norfolk, Richmond
- ESRI
Vienna
- Exponent Environmental Group
Alexandria
- Fluor Corp.
Arlington
- Foth Infrastructure & Environment, LLC
Dunn Loring
- Froehling & Robertson, Inc.
Chesapeake, Crozet, Fredericksburg,
Richmond, Roanoke, Sterling
- Gannett Fleming, Inc.
Alexandria, Fairfax, Newport News, Richmond
- GEO-CENTERS
Arlington, Quantico
- GeoEye
Dulles
- Geo-Marine, Inc.
Newport News
- GeoLogics Corp.
Alexandria
- Gilbane Building Company
Richmond
- GKY and Associates, Inc.
Chantilly
- Golder Associates
Richmond
- Gray & Pape, Inc.
Richmond
- Greeley and Hansen
Richmond
- Greenhorne & O'Mara, Inc.
Chantilly, Fredericksburg, Richmond
- Greenman-Pedersen, Inc.
Fredericksburg
- Groundwater & Environmental Services, Inc.
Blacksburg, Richmond
- Haley & Aldrich, Inc.
McLean
- Hanson Professional Services Inc.
Chantilly
- Harvard Design & Mapping Company, Inc.
Arlington
- HDR, Inc.
Alexandria, Norfolk, Richmond
- HEPACO
Chesapeake, Fredericksburg, Norfolk, Richmond
- Hillmann Environmental Group, LLC
Richmond
- HNTB Companies
Arlington
- Horne Engineering Services, Inc.
Fairfax
- HSMM
Alexandria, Fredericksburg, Lynchburg,
Roanoke, Virginia Beach
- HydroGeoLogic, Inc.
Arlington, Herndon
- Virginia Companies: I - R, S - Z.
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