MarkWest Pioneer, L.L.C.

Original Volume No. 1

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

Original Sheet No. 92 Original Sheet No. 92

GENERAL TERMS AND CONDITIONS

(Continued)

22.6.3. Transporter shall have no obligations to market any capacity to be

released by a Releasing Shipper. Transporter, however, may agree to

market capacity for a Releasing Shipper and may negotiate a fee with

the Releasing Shipper for such service.

22.7. Term

22.7.1. Any release under this section shall be for a minimum term of at

least one Gas Day.

22.7.2. Any release under this section shall be for a maximum term expiring

on the earlier of:

a) The last date this Tariff provision shall be effective;

b) The expiration date of Releasing Shipper’s FT Agreement when

the release is for the full term of such agreement; or

c) The expiration date specified by the Releasing Shipper in

the Shipper Notice.

22.8. Billing Adjustments to Releasing Shipper

22.8.1. Transporter shall credit Releasing Shipper’s monthly bill to reflect

the Reservation Charge invoiced to Replacement Shipper, provided

however, that in connection with a release of a volumetric rate, or

a negotiated rate with no reservation charge, Transporter shall

credit Shipper’s monthly bill with the amounts invoiced to the

Replacement Shipper, less any amounts attributable to variable

costs, which Transporter shall retain; and, provided further, that

notwithstanding any other provision of this Tariff, Transporter and

Shipper may agree upon a payment obligation, sharing arrangement, or

crediting mechanism that varies from or is in addition to the

provisions of this section.