ITEM 8.01. Other Events.

On June 26, 2009, MarkWest Energy Partners, L.P. ("MarkWest") entered into an agreement to sell the Steam Methane Reformer ("SMR") currently being constructed at its Javelina gas processing and fractionation facility in Corpus Christi, Texas. Under the terms of the agreement, the purchaser would complete the construction of the SMR and would provide hydrogen to MarkWest pursuant to a long-term agreement. MarkWest intends to use proceeds from the sale to pay down amounts outstanding under its revolving credit facility and for the continued development of strategic projects in the Marcellus Shale. The potential divestiture of the SMR is anticipated to close in the third quarter of 2009 and is subject to contingencies, including the receipt of required consents and approvals.

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