0001104659-11-009794 Sample Contracts

SUPPLEMENTAL INDENTURE MARKWEST ENERGY PARTNERS, L.P. AND MARKWEST ENERGY FINANCE CORPORATION AND THE SUBSIDIARY GUARANTORS NAMED HEREIN, AND WELLS FARGO BANK, NATIONAL ASSOCIATION, as Trustee

Fifth Supplemental Indenture • February 24th, 2011 • Markwest Energy Partners L P • Crude petroleum & natural gas • New York

• Contract Type
  Fifth Supplemental Indenture
• Filed
  February 24th, 2011
• Company
  Markwest Energy Partners L P
• Industry
  Crude petroleum & natural gas
• Jurisdiction
  New York

THIS FIFTH SUPPLEMENTAL INDENTURE (this “Supplemental Indenture”), dated as of February 24, 2011, is by and among MarkWest Energy Partners, L.P., a Delaware limited partnership (the “Company”), MarkWest Energy Finance Corporation, a Delaware corporation (“Finance Corp.” and, together with the Company, the “Issuers”), the Subsidiary Guarantors (as defined in the Indenture referred to herein), and Wells Fargo Bank, National Association, as trustee (the “Trustee”).