ALCOA Remediation Management, Inc.
American Electric Power
Anadarko Petroleum Corporation
Bobcat Gas Storage, Inc
Burlington Resources Oil & Gas Co., LP
Calpine Central, LP
Cameron Process Valves
CB&I Constructors, Inc.
Celanese Ltd.
Chesapeake
Chevron
City of Alice
City of Amarillo
City of Cedar Park
City of Corpus Christi
City of Gregory
City of Harlingen
City of Hondo
City of Ingleside
city of Lyford
City of McAllen
City of Mercedes
City of Palm Valley
City of Port Isabel
City of Port Lavaca
City of Primera
City of San Marcos
City of Shiner
City of Stockdale
City of Weslaco
City of Yoakum
Clearwater Disposal Systems, LLC
ConocoPhillips
Corpus Christi Army Depot
CPN Pipeline Company
Crosstex Energy Services
DCP Midstream
Del Mar College
Delta Airport Consultants, Inc.
Devon Energy
Dominion Exploration & Production
Duke Energy Services
El Paso Exploration & Production
Energy Transfer Corporation
Enterprise Products
Equistar
ExxonMobil
Flint Hills Resources, LP
Grande Communications
Housing Authority of Corpus Christi
Houston ISD
J.W. Williams, Inc.
Kinder-Morgan
Koch Pipeline Company, LP
Magnum Gas Storage, LLC
NuStar Logistics Operations, LP
Occidental Petroleum
Port of Corpus Christi Authority
Port of Harlingen
Port of Houston Authority
Shell Oil Company
Siemens Energy, Inc.
Spectra Energy
TOR Minerals International, Inc.
TxDOT
Valero Energy Corporation
Yoakum ISD