Type	Name	Date
Credit agreement	Second amendment to the second amended and restated credit agreement among MarkWest Hydrocarbon, Inc., as borrower, Royal Bank of Canada, as Administrative Agent and Collateral Agent for the Lenders, Royal Bank of Canada, U.S. Bank National Association, Bank of Oklahoma, N.A, SunTrust Bank and Fortis Capital Corp. (as assignee immediately following amendment)	03/20/2007
Credit agreement	First amendment to the second amended and restated credit agreement among MarkWest Hydrocarbon, Inc., as borrower, Royal Bank of Canada, as Administrative Agent and Collateral Agent for the Lenders, Royal Bank of Canada, U.S. Bank National Association, Bank of Oklahoma, N.A, and SunTrust Bank	02/23/2007
Credit agreement	Second amended and restated credit agreement among MarkWest Hydrocarbon, Inc., as borrower, Royal Bank of Canada, as Administrative Agent for the Lenders, Royal Bank of Canada, U.S. Bank National Association, Bank of Oklahoma, N.A, and SunTrust Bank as lenders	08/23/2006
Credit agreement	First amended and restated credit agreement, among MarkWest Hydrocarbon, Inc., as borrower, Royal Bank of Canada, as Administrative Agent for the Lenders, Royal Bank of Canada, U.S. Bank National Association and Bank of Oklahoma, N.A, as lenders	02/06/2006
Credit agreement	Third Amendment to Credit Agreement entered into as of December 30, 2005 among MarkWest Hydrocarbon, Inc., as the Borrower, Royal Bank of Canada, as Administrative Agent, the undersigned L/C Issuers and Lenders	01/05/2006
Registration rights agreement	Registration Rights Agreement	12/29/2005
Credit agreement	Second Amendment to Credit Agreement entered into as of November 15, 2005 among MarkWest Hydrocarbon, Inc., as the Borrower, Royal Bank of Canada, as Administrative Agent, the undersigned L/C Issuers and Lenders	11/18/2005
Credit agreement	Fourth Amended and Restated Credit Agreement	11/08/2005
Credit agreement	First Amendment to Credit Agreement entered into as of October 17, 2005 among MarkWest Hydrocarbon, Inc., as the Borrower, Royal Bank of Canada, as Administrative Agent, the undersigned L/C Issuers and Lenders	10/21/2005
Credit agreement	Second Amended and Restated Credit Agreement among MarkWest Energy Operating Company, L.L.C., as Borrower, MarkWest Energy Partners, L.P., as Guarantor, Royal Bank of Canada, as Administrative Agent, Fortis Capital Corp., as Syndication Agent, Bank One, NA, as Documentation Agent and Societe Generale, as Documentation Agent to the $315,000,000 Senior Credit Facility	10/12/2004
Credit agreement	First Amendment to the Second Amended and Restated Credit Agreement, among MarkWest Energy Operating Company, L.L.C., as Borrower, MarkWest Energy Partners, L.P., as Guarantor, Royal Bank of Canada, as Administrative Agent, Fortis Capital Corp., as Syndication Agent, Bank One, NA, as Documentation Agent and Societe Generale, as Documentation Agent	10/12/2004
Registration rights agreement	The Registration Rights Agreement among MarkWest Energy Partners, L.P., and MarkWest Energy GP, L.L.C. and each of Kayne Anderson Energy Fund II, L.P., Kayne Anderson Capital Income Partners, L.P., Kayne Anderson MLP Fund, L.P., Kayne Anderson Capital Income Fund, LTD., Kayne Anderson Income Partners, L.P., HFR RV Performance Master Trust, Tortoise Energy Infrastructure Corporation and Energy Income and Growth Fund, as Purchasers	10/12/2004