Members of the HPV Petroleum Testing Group

Alcoa Inc.
Big West Oil LLC
BP
Calcasieu Refining Company
Chevron Corporation
CHS Inc.
CITGO Asphalt Refining Company
CITGO Petroleum Corp.
Coffeyville Resources, Refining and Marketing, LLC
ConocoPhillips Company
Countrymark Refinery
Cross Oil Refining & Marketing, Inc.
Dakota Gasification Company
Delek Refining, LTD
Dynegy Liquids MKTG & Trade
Edgington Oil Company
Elkhorn Operating Company
Equilon Enterprises LLC/Motiva Enterprises LLC
Ergon Refining, Inc.
Ergon West Virginia Inc
ExxonMobil Americas Refining and Supply Company
Flint Hills Resources, LP
Formosa Hydrocarbons Co., Inc.
Giant Industries, Inc.
Hess Corporation
Holly Corp/Navajo Refining Co
Houston Refining LP
Hovensa, LLC
Hunt Refining Co.
Kern Oil & Refining Company
Lion Oil Company
Marathon Oil Company LLC
Merichem Chemicals & Refinery Serv LLC
Murphy Oil Corporation
National Cooperative Refinery Association
Neville Chemical Company
Pasadena Refining System, Inc.
PDV Midwest Refining, LLC
Placid Refining Company LLC
Safety-Kleen Oil Recovery
Sasol North America Inc.
Shell Oil Company
Sid Richardson Gasoline Co.
Silver Eagle Refining, Inc.
Sinclair Oil Corporation
South Hampton Refining Company
Sunoco Inc (R+M)
Tesoro Petroleum Corporation
The Goodyear Tire & Rubber Company
The Premcor Refining Group Inc.
Total Petrochemicals USA, Inc.
Tricor Refining, LLC
True Oil Co/88 Oil Co/Equit. Oil Purch. Co
US Oil & Refining Co.
Valero Energy Corp
Williams Energy Services
Wynnewood Refining Company

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