1. Halff Associates, Inc.
sub: CH Fenstermaker & Associates, L.L.C.
sub: Lazenby & Associates, Inc.
sub: JESCO Environmental & Geotechnical Services, Inc.
sub: H20 Partners, LLC
2. Dewberry Engineers, Inc.
sub: Forte & Tablada, Inc.
sub: Freese & Nichols
sub: The Estopinal Group
sub: Bender Consulting
3. Atkins North America, Inc.
sub: Michael Baker International, Inc.
sub: NTB Associates, Inc.
sub: GOTECH, Inc.
4. Quality Engineering & Surveying, L.L.C.
sub: Atlas Technical Consultants, L.L.C.
sub: ABC Group Communication Solutions
sub: Emergent Method, L.L.C.
sub: GIS Engineering, L.L.C.
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