MarkWest Pioneer, L.L.C.

Original Volume No. 1

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

Original Sheet No. 51 Original Sheet No. 51

GENERAL TERMS AND CONDITIONS

(Continued)

6.6. Shipper shall identify the location of any facilities to be constructed or

installed by any party affected by the proposed service.

6.7. Shipper’s request shall include a statement that it is willing to abide by

the terms of the applicable rate schedule, including the GT&C.

6.8. If requesting any firm service, Shipper shall make a prepayment by wire

transfer in an amount equal to the lesser of the Shipper’s applicable rates

multiplied by Shipper’s MDQ for two months service or $10,000. The

prepayment, plus the accrued interest from the date payment is received

until the date service commences, shall be applied to the first month’s

invoice, and to the invoices of subsequent month(s), as necessary, until the

amount is fully credited. The accrued interest herein shall be computed in

a manner consistent with Section 154.501(d) of the Commission’s Regulations.

6.8.1. If the requested service is not available, Transporter shall refund

the entire amount of the prepayment within thirty (30) days of

notification by Transporter that service cannot be provided.

6.9. Shipper shall meet creditworthiness provisions set forth in Section 7 of the

GT&C.

6.10. Reservation of capacity for new services or expansion projects.

6.10.1. Reservation of Capacity for New Service – Unless allowed by

Transporter on a not unduly discriminatory basis, a request for

service shall be made no earlier than 180 days prior to the proposed

commencement date of service. Transporter may reserve capacity for

such new service if Transporter determines that such reservation is

economically justified. Transporter shall, on a limited-term basis

up to the in-service date of the new service request, make generally

available any capacity reserved under this section. The

construction of any additional facilities required for a new service

is addressed in Section 20 of the GT&C.