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. 13 Original Sheet No. 13

RATE SCHEDULE FT-1

(Continued)

4.3. Authorized Overrun Charge: The applicable AOS rate multiplied by any

Authorized Overrun quantities scheduled for Shipper during the billing

month;

4.4. Other Charges: The ACA charge and any other applicable surcharges in the

Statement of Rates and Charges, multiplied by the applicable quantities

scheduled for Shipper during the billing month; and

4.5. New Facilities Charge: When applicable, a charge will be established

pursuant to Section 20 of the GT&C.

4.6. Fuel and Gas Losses: Notwithstanding other sections of this Rate Schedule,

Transporter shall retain the quantity of Gas required for Fuel and Gas

Losses associated with Transporter’s provision of transportation service

pursuant to this Rate Schedule. The quantity of Gas retained by Transporter

for Fuel and Gas Losses shall be equal to the quantity of Gas scheduled for

receipt for Shipper during the billing month, multiplied by the applicable

Fuel and Gas Loss Retention Percentage shown on the Statement of Rates and

Charges of this Tariff.

4.7. Shipper’s monthly bill shall, if applicable, be credited pursuant to Section

22.8 of the GT&C for revenues received by Transporter for Shipper’s release

of capacity during the billing month.

5. RESERVATIONS

Transporter reserves the right to take such actions as may be required to preserve

the integrity of its system, including maintenance of service to other firm

customers.