- AT&T
- AT&T/Paradyne
- Baker Engineering
- Base Closure Agency
- Bayer Corporation
- Bechtel Hanford, Inc.
- Bhate
- Black and Veatch
- BNFL
- Boise Cascade
- Booz Allen Hamilton
- Bowdoin College
- CH2M Hill
- Connecticut Department of Administration
- Cytec Industries
- Decisionism
- Dun & Bradstreet Planning Services
- DuPont
- EarthTech
- U.S. Environmental Protection Agency, Regions
1, 2, 3, 4, 5, 10
- Federal Bureau of Investigation
- Florida Department of
Environmental Protection
- Gannett Fleming
- Halliburton NUS
- Honeywell
- ICF Kaiser
- L.L. Bean, Inc.
- Maine Department of Labor
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- Maryland Department of the Environment
- Mississippi Department
of Environmental Quality
- Monsanto
- Naval Systems Engineering Activity
- Navy Facilities Engineering
Command Northern Division
- Navy Facilities Engineering Command
Atlantic Division
- Navy Facilities Engineering Command Southern
Division
- Nielsen Media Research
- North Carolina Department of Environmental
Health and Natural Resources
- OHM
- PPG Chemicals
- Public Services of New Mexico
- Rhode Island Department
of Environmental Management
- Rust Environment
- Saint Petersburg College
- Spear Technologies
- SMRT, Inc.
- South Carolina Department of Health and Environmental
Concerns
- Teknekron Infoswitch
- Tenera, Inc.
- Union Carbide
- University of Florida
- University of Southern Maine
- URS
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