Operating Units

Airlan Telecom Services, L.P.
Allteck Line Contractors, Inc.
Arby Construction Inc.
Advanced Technologies and Installation Corp.
Bradford Brothers
H.L. Chapman Companies
Conti Communications
Croce Electric Company, Inc.
Crown Fiber Communications, Inc.
Dillard Smith Construction Company
Driftwood Electrical Contractors, Inc.
Edwards Pipeline Company
Environmental Professional Associates
Global Enercom Management, Inc.
Golden State Utility Co., Inc.
Haines Construction Company
Harker & Harker, Inc.
Intermountain Electric, Inc.
Irby Construction Company
Manuel Bros., Inc.
Mears Group, Inc.
Myers Cable, Inc.
Mustang Line Contractors, Inc.
NetCom Management Group, Inc.
Network Communication Services, Inc.
Network Electric Company
North Sky Communications
North Houston Pole Line
Northern Line Layers, Inc.
P.D.G. Electric Company
Pac West Construction
PAR Electrical Contractors, Inc.
Parkside Utility Construction Company, Inc.
Potelco, Inc.
Professional Teleconcepts, Inc.
Ranger Field Services, Inc.
Riggin and Diggin Construction, Inc.
The Ryan Company, Inc.
Seaward Corporation
Southeast Pipeline Construction, Inc.
Spalj Construction Company
Sumter Utilities, Inc.
Telecom Network Specialists, Inc.
Tom Allen Construction Company
TRANS TECH Electric, Inc.
Trawick Construction Company, Inc.
TTM, Inc.
TVS Systems, Inc.
Underground Construction Co., Inc.
Utilco, Inc.
VCI Telecom, Inc.
R.A. Waffensmith & Co., Inc.
West Coast Communications, Inc.
World Fiber, Inc.