0001047469-08-004543 Sample Contracts

MARKWEST ENERGY PARTNERS, L.P. 5,000,000 Common Units Representing Limited Partner Interests UNDERWRITING AGREEMENT

Underwriting Agreement • April 11th, 2008 • Markwest Energy Partners L P • Crude petroleum & natural gas • New York

• Contract Type
  Underwriting Agreement
• Filed
  April 11th, 2008
• Company
  Markwest Energy Partners L P
• Industry
  Crude petroleum & natural gas
• Jurisdiction
  New York

LEHMAN BROTHERS INC. MORGAN STANLEY & CO. INCORPORATED As Representatives of the several Underwriters named in Schedule 1 attached hereto, c/o Lehman Brothers Inc. 745 Seventh Avenue New York, New York 10019