1. Hardesty & Hanover, L.L.C.
sub: APS Engineering & Testing, L.L.C.
sub: Bridge Diagnostics, Inc.
sub: Gaea Consultants, L.L.C.
sub: KTA-Tator, Inc.
sub: Moffatt & Nichol, Inc.
sub: Urban Systems Associates, Inc.
2. HDR Engineering, Inc.
sub: APS Engineering & Testing, L.L.C.
sub: Bridge Diagnostics, Inc.
sub: CH Fenstermaker & Associates, L.L.C.
sub: Meyer Engineers, Ltd.
3. Modjeski and Masters, Inc.
sub: Arcadis U.S., Inc.
sub: Vectura Consulting Services, L.L.C.
sub: Marrero, Couvillon & Associates, L.L.C.
sub: Fugro USA Land, Inc.
sub: Wiss, Janney, Elstner Associates, Inc.
sub: Moffatt & Nichol, Inc.
sub: Meyer Engineers, Ltd.
sub: CH Fenstermaker & Associates, L.L.C.
sub: Bridge Diagnostics, Inc.
sub: KGC Environmental Services, Inc.
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