MarkWest Pioneer, L.L.C.

Original Volume No. 1

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

Original Sheet No. 69.1 Original Sheet No. 69.1

Superseding: Original Sheet No. 69

GENERAL TERMS AND CONDITIONS

(Continued)

13.2.3 Payback Quantities nominations shall be evaluated for scheduling and curtailment

priority purposes on the same basis as other nominations under the associated FT

or IT Agreement.

13.3 Monthly Imbalances: Where Shipper has created a monthly imbalance on Transporter’s

pipeline that has not been eliminated through netting and trading, Shipper shall pay

Transporter a Monthly Imbalance Charge in the following amounts:

13.3.1 Normal Operating Conditions - For monthly imbalances accumulated during normal

operating conditions, Shipper’s Monthly Imbalance Charge shall equal zero for

monthly imbalances between zero and 5 percent, and $0.10 per MMBtu for imbalances

in excess of 5 percent. For purposes of this section, Shipper’s actual

cumulative receipts during normal operating conditions stated as a percent of

actual cumulative deliveries during normal operating conditions during the

Billing Month.

13.3.2 OFO Operating Conditions - For monthly imbalances accumulated during periods when

an OFO pursuant to Section 11 is in effect, Shipper’s Monthly Imbalance Charge on

monthly imbalances shall be as forth in the applicable bracket: