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

Type	Name	Date
Employment agreement	Executive Employment Agreement with Frank M. Semple	09/11/2007

Type	Name	Date
Merger agreement	Agreement and Plan of Redemption and Merger, by and among MarkWest Hydrocarbon, Inc., MarkWest Energy Partners, L.P. and MWEP, L.L.C	09/06/2007
Exchange agreement	Exchange Agreement, by and among MarkWest Hydrocarbon, Inc., MarkWest Energy Partners, L.P. and MarkWest Energy, GP L.L.C	09/06/2007
Voting agreement	Voting Agreement, by and among MarkWest Energy Partners, L.P., John M. Fox and MWHC Holding, Inc	09/06/2007
Contribution agreement	Class B Membership Interest Contribution Agreement, by and among MarkWest Energy Partners, L.P. and the sellers name therein	09/06/2007
Acquisition / asset purchase agreement	Asset and Sale Agreement, among MarkWest Energy Partners and El Paso Corporation	09/21/2005
Acquisition / asset purchase agreement	Asset and Sale Agreement, among MarkWest Energy Partners and Valero Energy Corp	09/21/2005
Acquisition / asset purchase agreement	Purchase and Sale Agreement effective as of January 1, 2005 between MarkWest Energy Partners L.P. and Enterprise Products Operating L.P	04/06/2005
Acquisition / asset purchase agreement	Asset Purchase and Sale Agreement and Addendum, thereto, by and between American Central Eastern Texas Gas Company Limited Partnership, ACGC Gathering Company, L.L.C. and MarkWest Energy East Texas Gas Company L.P	10/12/2004
Acquisition / asset purchase agreement	Unit Purchase 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
Acquisition / asset purchase agreement	Clarification and Amending Agreement re: Share Purchase Agreement, between MarkWest Hydrocarbon, Inc. and Advantage Oil & Gas Ltd	12/17/2003
Acquisition / asset purchase agreement	Share Purchase Agreement, by and among MarkWest Hydrocarbon, Inc. and Advantage Oil & Gas Ltd	12/17/2003
Acquisition / asset purchase agreement	Purchase and Sale Agreement, by and among MarkWest Hydrocarbon, Inc., MarkWest Resources, Inc. and XTO Energy Inc	07/15/2003

Type	Name	Date
Lease agreement	Office Lease Agreement between MarkWest Energy Partners, L.P. and Park Central Property, L.L.C	04/25/2006
Tenant work letter	Tennant Work Letter between MarkWest Energy Partners, L.P. and Park Central Property, L.L.C	04/25/2006

Type	Name	Date
Other	Summary of Director Compensation	02/02/2006
Other	Summary of the 2005 Incentive Compensation Plan Performance Targets	02/02/2006
Other	Summary of the 2006 Incentive Compensation Plan Performance Targets	02/02/2006
Other	Agreement between MarkWest Hydrocarbon, Inc. and Paper, Allied-Industrial, Chemical and Energy Workers International Union and its Sub-Local 5-372	08/18/2005
Other	Waiver Letters	07/14/2005
Other	Waiver Letters	05/05/2005
Other	Waiver Letters	04/06/2005
Other	Summary of Director Compensation	01/27/2005
Other	Summary of the 2004 Incentive Compensation Plan Performance Targets	01/27/2005
Other	Summary of the 2005 Incentive Compensation Plan Performance Targets	01/27/2005