AES Deepwater
Air Liquide America Corporation
Air Products and Chemicals Inc.
Akzo Chemicals
Alcoa
Amerada Hess
Aristech Chemical Corporation
Ashland Petrochemical
Atlas Processing Company
BP Amoco Oil Company
BASF Corporation
Bay Inc.
Bayer Corporation
Beaumont Methanol
Bechtel Corporation
Belmont Construction
Boeing
Cajun Electric Power Co-Op
Calumet Lubricants Co.
CEDA, Inc.
Celanese
Central Power and Light
Chevron
Chicago Bridge & Iron
Citgo
City of Austin Power Plant
City of Houston
Clark Oil Refining & Marketing, Inc.
Coastal Aruba Refining Company
Coastal Corporation
Conex
Conoco Inc.
Continental Emsco
Cooper Industries
Crown Central Petroleum
Diamond Offshore
Dixie Chemical Company
Donahue Paper
Dow Chemical
Dresser Rand
DuPont
Dynegy Corporation
El Paso Energy Corporation
Elf Atochem
Enron Corporation
Entergy
Enterprise Products
Equilon
Equistar Chemicals, L.P.
ExxonMobil
Farmers Marine Copper Works
Farmland Industries
Fina Oil & Chemical
Fine Organics Corporation
Firestone Synthetics Rubber
FKI Logistex
Fluor Daniel
FMC Corporation
Formosa Plastics
Frontier Refining Inc.
GATX Terminals Corporation
General Foods - Maxwell House
Geon Company
Georgia Gulf
Giant Refining Company
Global Marine Drilling Co.
Global Octanes
Goodyear Tire & Rubber Company
Guam Power Authority
H.B. Zachary Company
Hess Oil Virgin Islands Corporation
Houston Dynamic Services
Houston Pipeline

Howell Industries, Inc.
Huntsman Corporation
ICI Americas
J.E. Merit Constructors
Jacobs Engineering Group, Inc.
Kellogg Brown & Root
Koch Petroleum Group, L.P.
La Gloria Oil & Gas Company
Linde Gas
Lion Oil
Lower Colorado River Authority
Lubrizol Petroleum Chemicals
Lufkin Industries Inc.
Lyondell Chemical Company
Lyondell Citgo Refining
M&M Mars
Marathon Ashland
Merichem Company
Monsanto
Motiva
Murphy Oil Company
Nabisco company
Navajo Refining
Nova Chemical
Occidental Chemical Corporation
Oxy Vinyls Corporation
Pennzoil Quaker State
Petro - Canada
Phillip Services Corporation
Phillips 66 Company
Placid Refining
PPG Industries Incorporated
Praxair Inc.
Premcor
Pride Refining, Inc.
Public Services of Okalahoma
Puerto Rico Sun Oil Co.
Reliant Energy
Reynolds Aluminum
Rhodia Incorporated
Rohm & Haas Company
S & B Engineers & Constructors, Ltd.
Saudi Aramco
Shell Oil & Chemical Company
Siemens Dematic
Siemens Westinghouse
Simpson Paper Co.
Sinclair Oil Corporation
Solutia Inc.
Solvay Polymers, Inc.
South Carolina Electric & Gas
Sterling Chemical
Tampa Electric
Tennessee Eastman Division
Tennessee Gas Pipeline Company
Tesoro Petroleum
Texaco
Texas Eastman
Texas Gas Corporation
Texas Petrochemical Corporation
Texas Utilities Co.
Timec Companies
Total Petroleum, Inc.
Transocean Offshore Inc.
Trinity Industries
Triple "S" Industrial
US Contractors, Inc.
Ultramar Diamond Shamrock
Union Carbide Corporation
Union Pump Company
Valero Energy Corporation
Vista Chemical Company
Western Industrial Contractors
Westlake Polymers
Williams Energy Services