MarkWest Pioneer, L.L.C.

Original Volume No. 1

 Contents / Previous / Next / Main Tariff Index

Effective Date: 04/01/2009, Docket: RP09-321-000, Status: Effective

Original Sheet No. 102 Original Sheet No. 102

GENERAL TERMS AND CONDITIONS

(Continued)

27.6. Except as set forth in Section 27.4, any such cause or contingency exempting

Shipper from liability for non-performance (except where prevented by valid

orders or requirements of Federal, State of other governmental regulatory

bodies having jurisdiction in the premises) shall not relieve Shipper of its

obligation to pay demand charges, reservation charges, or other amounts owed

in accordance with the provisions of the applicable rate schedule and FT

Agreement. In every case, Shipper shall exercise diligence to remove any

such interference with its receipt of Gas and shall resume such receipt at

the earliest practicable time.

27.7. In the event of Force Majeure, Transporter shall curtail delivery of Gas to

Shipper in accordance with Section 10 of these GT&C.

27.8. Transporter shall post on the Public Informational Posting section of

Transporter’s Website any declaration by it of a Force Majeure situation.

This posting will address the nature of the Force Majeure, the facilities

and services affected, the anticipated extent of the impact and its likely

duration.