MarkWest Pioneer, L.L.C.

Original Volume No. 1

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Effective Date: 02/01/2010, Docket: RP10-242-000, Status: Effective

Second Revised Sheet No. 76 Second Revised Sheet No. 76

Superseding: First Revised Sheet No. 76

GENERAL TERMS AND CONDITIONS

(Continued)

18. FUEL AND GAS LOSS RETENTION PERCENTAGES PERCENTAGE

18.1 Applicability: Fuel and Gas Loss Quantities shall be furnished in kind by Shipper.

The Fuel and Gas Loss Reimbursement Percentage (FRP) shall apply to Rate Schedules

FT-1, FT-2 and IT. The total FRP will be the sum of two components: a Base FRP and

an FRP True-up Adjustment percentage. The FRP will be shown on the Statement of

Rates and Charges of this Tariff. The Base FRP will be determined pursuant to

Section 18.3. The FRP True-up Adjustment percentage will be determined pursuant to

Section 18.4.

18.2 Quarterly FRP Filing: Transporter shall make quarterly limited Natural Gas Act

section 4 filings setting forth proposed changes to the Base FRP and the FRP True-up

Adjustment. Revisions to the Base FRP and the FRP True-up Adjustment will be

effective the first day of each quarter, January 1, April 1, July 1 and October 1,

with revisions filed no later than thirty (30) days prior to the effective date.

18.3 Determination of the Base FRP: The Base FRP will be calculated by dividing the Fuel

and Gas Loss Quantities for the prior calendar quarter by the total transportation

volumes projected to be scheduled for the calendar quarter in which the FRP will be

in effect. Transporter will round the resulting percentage to the nearest 0.01.