MarkWest Pioneer, L.L.C.

Original Volume No. 1

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

First Revised Sheet No. 76.1 First Revised Sheet No. 76.1

Superseding: Original Sheet No. 76.1

GENERAL TERMS AND CONDITIONS

(Continued)

18.4 Determination of FRP True-up Adjustment: To determine the FRP True-up Adjustment,

Transporter will first calculate the FRP “True-up Quantity.” The True-up Quantity

shall equal the difference between the Fuel and Gas Loss quantities received from

Shippers during the prior calendar quarter and the actual Fuel and Gas Loss

quantities experienced on Transporter’s system during the same period. The FRP

True-up Adjustment will be calculated by dividing the True-up Quantity 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%.

18.5 Interim Adjustment to FRP: If Transporter determines that actual Fuel and Gas Loss

quantities diverge significantly from the quantities retained through the FRP,

Transporter may make an interim limited Natural Gas Act section 4 filing to revise

the FRP.