MarkWest Pioneer, L.L.C.

Original Volume No. 1

Effective Date: 12/31/9999, Docket: RP09-532-000, Status: Accepted

Substitute Original Sheet No. 70 Substitute Original Sheet No. 70

Superseding: Original Sheet No. 70

GENERAL TERMS AND CONDITIONS

(Continued)

13.3.2 (Continued)

Monthly Imbalances Imbalance Charge per MMBtu

>5% - 7% $25 plus the Daily Index Price

>7% - 15% $50 plus the Daily Index Price

>15% $100 plus the Daily Index Price

For purposes of this section, Shipper’s monthly imbalance shall equal the

difference between Shipper’s actual cumulative receipts during OFO operating

conditions and Shipper’s actual cumulative deliveries during OFO operating

conditions stated as a percent of Shipper’s actual cumulative deliveries during

OFO operating condition during the Billing Month.

For purposes of this section, the Daily Index Price shall equal the high in the

range of prices reported each day for “CENTERPOINT, EAST” as published by Gas

Daily. If Gas Daily is no longer published, an equivalent index or indicator

shall be published on Transporter’s Website and this definition will be revised.

13.3.3 Recovery of Volumes Owed to Transporter - Whenever Shipper’s actual cumulative

receipts during Billing Month are less than actual cumulative deliveries,

Transporter will recover the cost of the volumes owed to Transporter by assessing

Shipper the replacement costs associated with the excess gas taken during the

Billing Month. Such costs will be based on the average weekly price reported for

“CENTERPOINT, EAST” as published by Gas Daily during the Billing Month that the

imbalance occurred multiplied by Shipper’s imbalance volumes.