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Alyeska Pipeline Services Company
Amoco Petroleum Company
Ashland Petroleum Company
BDM Petroleum Technologies
BP Amoco
British Petroleum Corporation
Burlington Resources Oil & Gas
Chevron Products Company
Chevron Research & Technology Company
Citgo Petroleum Company
Clark Refining Company
Coastal Petroleum Company
Coffeeville Resources Refining
& Marketing
Cumberland Farms, Inc.
El Paso Energy Co.
Equilon Enterprises LLC
Exxon Company, USA
Hovensa
LLC
Kerr-McGee Corporation
Marathon Ashland Pipeline Company
Mobil Oil Company
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Natural Gas Pipeline Company
Oxford Farms
Peoples Gas System, Inc.
Phillips Petroleum Company
Plantation Pipeline Company
Shell Development Company
Shell Global Solutions
Shell Martinez Refining Company
Shell Oil Products Company
Southern Petroleum Labs
Sunoco
Tesoro Hawaii Corporation
Texaco
Ultramar Diamond Shamrock Corporation
Valero
Energy Corporation
Williams
Gas Pipelines - Transco
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