1. HNTB Corporation
sub: TRC Engineers, Inc.
sub: GOTECH, Inc.
sub: KTA-Tator, Inc.
sub: Moffatt & Nichol, Inc.
2. Michael Baker International, Inc.
sub: Infrastructure Engineers, Inc.
sub: Specialty Diving of Louisiana, Inc.
sub: PSI (Professional Service Industries), Inc.
sub: Civil Design & Construction, Inc.
3. Gresham, Smith and Partners
sub: Moffatt & Nichol, Inc.
sub: HDR Engineering, Inc.
sub: Mainstream Commercial Divers, Inc.
sub: Forte & Tablada, Inc.
sub: KTA-Tator, Inc.
sub: Bridge Diagnostics, Inc.
4. Thompson Engineering, Inc.
sub: HDR Engineering, Inc.
sub: G.E.C., Inc.
sub: Infrastructure Engineers, Inc.
sub: Civil Design & Construction, Inc.
sub: Rahman and Associates, Inc.
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