1. G.E.C., Inc.
Sub: Volkert, Inc.
Sub: HNTB Corporation
Sub: Greenman-Pedersen, Inc.
Sub: GOTECH, Inc.
2. ECM Consultants, Inc.
Sub: APS Design & Testing, L.L.C.
Sub: Huval & Associates, Inc.
Sub: Arcadis U.S., Inc.
Sub: Civil Design & Construction, Inc.
3. Michael Baker International, Inc.
Sub: CH Fenstermaker & Associates, L.L.C.
Sub: Arcadis U.S., Inc.
Sub: GOTECH, Inc.
Sub: Thompson Engineering, Inc.
4. Atlas Technical Consultants, L.L.C.
Sub: Richard C. Lambert Consultants, L.L.C.
Sub: Digital Engineering & Imaging, Inc.
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