MarkWest Energy Partners, LP (MWE)

19. Employee Benefit Plan

All employees dedicated to, or otherwise principally supporting the Partnership are employees of MarkWest Hydrocarbon, and substantially all of these employees are participants in MarkWest Hydrocarbon’s defined contribution benefit plan. The employer matching contribution expense related to this plan was $1.6 million, $1.1 million and $1.0 million for the years ended December 31, 2008, 2007 and 2006, respectively. The plan is discretionary, with annual contributions determined by the General Partner’s board of directors.

19. Employee Benefit Plan

        All employees dedicated to, or otherwise principally supporting the Partnership are employees of MarkWest Hydrocarbon, and substantially all of these employees are participants in MarkWest Hydrocarbon's defined contribution benefit plan. The employer matching contribution expense related to this plan was $1.6 million, $1.1 million and $1.0 million for the years ended December 31, 2008, 2007 and 2006, respectively. The plan is discretionary, with annual contributions determined by the General Partner's board of directors.

19. Employee Benefit Plan

        All employees dedicated to, or otherwise principally supporting the Partnership are employees of MarkWest Hydrocarbon, and substantially all of these employees are participants in
MarkWest Hydrocarbon's defined contribution benefit plan. The employer matching contribution expense related to this plan was $1.6 million, $1.1 million and $1.0 million for the
years ended December 31, 2008, 2007 and 2006, respectively. The plan is discretionary, with annual contributions determined by the General Partner's board of directors.

19. Employee Benefit Plan

        All employees dedicated to, or otherwise principally supporting the Partnership are employees of MarkWest Hydrocarbon, and substantially all of these employees are participants in
MarkWest Hydrocarbon's defined contribution benefit plan. The employer matching contribution expense related to this plan was $1.6 million, $1.1 million and $1.0 million for the
years ended December 31, 2008, 2007 and 2006, respectively. The plan is discretionary, with annual contributions determined by the General Partner's board of directors.

16. Employee Benefit Plan

        The Company made matching contributions of $1.1 million, $1.0 million and $1.0 million to a 401(k) savings and profit-sharing plan for the years ended December 31, 2007, 2006 and 2005, respectively. The Company did not contribute any common shares to a 401(k) savings or profit-sharing plan for the year ended December 31, 2007 or 2006. The Company contributed approximately 12,000 common shares to a 401(k) savings and profit-sharing plan for the year ended December 31, 2005, with an aggregate fair value of $1.0 million. The plan is discretionary, with annual contributions determined by the Company's Board of Directors.

15.    Employee Benefit Plan

        All employees dedicated to, or otherwise principally supporting the Partnership are employees of MarkWest Hydrocarbon, and substantially all of these employees are participants in MarkWest Hydrocarbon's defined contribution benefit plan. The employer matching contribution expense related to this plan allocated to the Partnership was $0.9 million, for each of the years ended December 31, 2007, 2006 and 2005, respectively. The plan is discretionary, with annual contributions determined by MarkWest Hydrocarbon's Board of Directors.

15.    Employee Benefit Plan

        All employees dedicated to, or otherwise principally supporting the Partnership are employees of MarkWest Hydrocarbon, and substantially all of these employees
are participants in MarkWest Hydrocarbon's defined contribution benefit plan. The employer matching contribution expense related to this plan allocated to the Partnership was $0.9 million, for
each of the years ended December 31, 2007, 2006 and 2005, respectively. The plan is discretionary, with annual contributions determined by MarkWest Hydrocarbon's Board of Directors.

15. Employee Benefit Plan

        All employees dedicated to, or otherwise principally supporting the Partnership are employees of MarkWest Hydrocarbon, and substantially all of these employees are participants in MarkWest Hydrocarbon's defined contribution benefit plan. Costs related to this plan allocated to the Partnership were $0.9 million, $0.9 million and $0.2 million for the years ended December 31, 2006, 2005 and 2004, respectively. The plan is discretionary, with annual contributions determined by MarkWest Hydrocarbon's Board of Directors.

13.       Employee Benefit Plan

All employees dedicated to, or otherwise principally supporting the Partnership are employees of MarkWest Hydrocarbon, and substantially all of these employees are participants in MarkWest Hydrocarbon’s defined contribution benefit plan. Costs related to this plan allocated to the Partnership were $0.1 million, $0.1 million and $0.2 million for the years ended December 31, 2005, 2004 and 2003, respectively. The plan is discretionary, with annual contributions determined by MarkWest Hydrocarbon’s Board of Directors.

13.  Employee Benefit Plan

All employees dedicated to, or otherwise principally supporting the Partnership are employees of MarkWest Hydrocarbon, and substantially all of these employees are participants in MarkWest Hydrocarbon’s defined contribution benefit plan.  Costs related to this plan allocated to the Partnership were $0.1 million, $0.1 million and $0.2 million for the years ended December 31, 2005, 2004 and 2003, respectively.  The plan is discretionary, with annual contributions determined by MarkWest Hydrocarbon’s Board of Directors.

15.       Employee Benefit Plan

All employees dedicated to, or otherwise principally supporting, the Partnership are employees of MarkWest Hydrocarbon and substantially all of these employees are participants in MarkWest Hydrocarbon’s defined contribution benefit plan.  Costs related to this plan allocated to the Partnership were $0.1 million, $0.2 million and $0.1 million for the years ended December 31, 2004, 2003 and 2002, respectively.  The plan is discretionary, with annual contributions determined by MarkWest Hydrocarbon’s Board of Directors.