1. WSP USA, Inc.
Sub: TRC Engineers, Inc.
Sub: Mott MacDonald, L.L.C.
Sub: Anastasia Brenan Communications Group, L.L.C.
Sub: GOTECH, Inc.
Sub: Metro-Source, L.L.C.
2. Michael Baker International, Inc.
Sub: Vectura Consulting Services, L.L.C.
Sub: Stanton Constructability Services, L.L.C.
Sub: Mercator Advisors, L.L.C.
Sub: Anastasia Brenan Communications Group, L.L.C.
3. HDR Engineering, Inc.
Sub: InfraStrategies, L.L.C.
Sub: Alliance Transportation Group, Inc.
Sub: GOTECH, Inc.
4. Volkert, Inc.
Sub: Alliance Transportation Group, Inc.
Sub: T.Y. Lin International
Sub: Arup USA, Inc.
5. HNTB Corporation
Sub: Anastasia Brenan Communications Group, L.L.C.
Sub: Baez Consulting, L.L.C.
Sub: Forte & Tablada, Inc.
Sub: The Hawthorne Agency, Inc.
Sub: G.E.C., Inc.
Sub: KPMG, L.L.P.
Sub: Vectura Consulting Services, L.L.C.
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