1. TRC Engineers, Inc.
Sub: Arcadis U.S., Inc.
Sub: Civil Design & Construction, Inc.
Sub: Regis Infrastructure Group, L.L.C.
2. Stantec Consulting Services, Inc.
Sub: Huval & Associates, Inc.
Sub: Civil Design & Construction, Inc.
Sub: Vectura Consulting Services, L.L.C.
3. Sigma Consulting Group, Inc.
Sub: Arcadis U.S., Inc.
Sub: Vectura Consulting Services, L.L.C.
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