Type	Name	Date
Credit agreement	Fourth Amendment to Amended and Restated Credit Agreement, among MarkWest Energy Partners, L.P., Wells Fargo Bank, National Association, as Administrative Agent, and the other agents and lenders party thereto	12/26/2012
Credit agreement	Third Amendment to Amended and Restated Credit Agreement, among MarkWest Energy Partners, L.P., Wells Fargo Bank, National Association, as Administrative Agent, and the other agents and lenders party thereto	06/29/2012
Credit agreement	Second Amendment to Amended and Restated Credit Agreement, among MarkWest Energy Partners, L.P., Wells Fargo Bank, National Association, as Administrative Agent, and the other agents and lenders party thereto	12/30/2011
Indenture	Indenture, by and among MarkWest Energy Partners, L.P., MarkWest Energy Finance Corporation, the Subsidiary Guarantors named therein and Wells Fargo Bank, National Association, as trustee	11/03/2010
Credit agreement	Amended and restated Credit Agreement among MarkWest Energy Partners, L.P., Wells Fargo Bank, National Association, as Administrative Agent, RBC Capital Markets, as Syndication Agent, BNP Paribas, Morgan Stanley Bank and U.S. Bank National Association, as Documentation Agents, and the lenders party thereto	07/07/2010