Exhibit 4.6 CLARK USA, INC. 10 7/8% SERIES B SENIOR NOTES DUE 2005 SUPPLEMENTAL INDENTURE Dated as of August 10, 1998Supplemental Indenture • March 31st, 1999 • Clark Usa Inc /De/ • Petroleum refining • New York
Exhibit 4.4 CLARK USA, INC. 11 1/2% SUBORDINATED EXCHANGE DEBENTURES DUE 2009 SUPPLEMENTAL INDENTURE Dated as of August 10, 1998Clark Usa Inc /De/ • March 31st, 1999 • Petroleum refining • New York
