- Bobes Associates
- Brown & Caldwell
- Camp Dresser & Mc Kee Inc
- CCL Consultants Inc
- CHP & Assoc
- Computer Merchant LTD
- GRG Consulting Engineers
- GRG Consulting Engineers Inc
- Horizon Engineering Group Inc
- Malcolm Pirnie Inc
- Metric Engineering Inc
- Public Resources Management
- Technology Research & Cnsltng
- WCG/Neel-Schaffer
