AMERICAN REFINING GROUP
CALUMET LUBRICANTS CO.
CHEVRON PHILLIPS CHEMICAL COMPANY LP
CITGO PETROLEUM CORPORATION
CLEAN HARBORS ENVIRONMENTAL SERVICES
CONOCOPHILLIPS COMPANY
CROSS OIL REFINING & MARKETING, INC.
ERGON
| FLINT HILLS RESOURCES
GARY WILLIAMS ENERGY CORPORATION
GEORGIA GULF CORPORATION
HELM USA
ICC CHEMICAL CORPORATION
INEOS AMERICAS LLC
KERN REFINING
MARUBENI
| NACHURS SOLUTIONS
OLD WORLD INDUSTRIES, INC.
SAFETY KLEEN CORPORATION
SASOL NORTH AMERICA
SUNOCO, INC.
TAUBER PETROCHEMICAL CO.
TOTAL PETROCHEMICALS
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