- Black & Veatch
- Construction, consulting, and engineering company that specializes in energy, water, telecommunications, federal, and environmental infrastructure development.
- Boyle Engineering Corporation
- A consulting engineering firm providing a full range of civil, water, water resources, wastewater, stormwater, transportation, electrical, mechanical, structural, environmental, and instrumentation engineering services to public and private clients.
- Brierley Associates
- Specializes in providing design, analysis and management consulting services for major underground construction projects.
- CH2M Hill
- Full-service engineering, construction, and operation contracting firm serving a global clientele.
- Geoconsol
- Tunnel boring, geotechnical, differing site conditions, claims, underground construction, experts.
- Parsons
- Employee-owned engineering and construction company. Caters to logistical and design-build project needs.
- PB (Parsons Brinckerchoff)
- Transportation engineering company provides planning, design, construction and program management, and consulting services for international construction projects.
- Stantec
- Provider of professional design and consulting services in planning, engineering, architecture, surveying, economics, and project management.
- U.T.S. Ltd.
- Providing pipeline services and testing solutions to the owners and operators of all types of pipework.
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