MarkWest Pioneer, L.L.C.

Original Volume No. 1

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

First Revised Sheet No. 71 First Revised Sheet No. 71

Superseding: Original Sheet No. 71

GENERAL TERMS AND CONDITIONS

(Continued)

13.4 Contract Termination - Shipper shall coordinate with Transporter to reduce to zero,

within 60 days of contract termination, Shipper’s Net Imbalance.

13.4.1 For purposes of this section, Shipper’s Net Imbalance shall equal the net sum of

Shipper’s monthly imbalances remaining at contract termination.

13.5 Imbalance Netting and Trading - Transporter will net Shipper’s imbalances on a monthly

basis across all of Shipper’s FT or IT Agreements. Shipper may trade any imbalances

incurred under this section with other shippers on Transporter’s system, provided the

imbalances to be traded are off-setting. Whenever requested and whenever possible,

Transporter will post requests to trade imbalances on Transporter’s Website. Trades may

be completed by notifying Transporter between 9:00 am and 5:00 pm Central Clock Time on

any business day. Trades will be deemed completed upon notification to Transporter.

13.6 Unauthorized Overrun Charge – If Shipper exceeds its MDQ without approval of the

Transporter, Shipper shall pay a rate of $10 for each MMBtu of Gas taken in excess of

Shipper’s MDQ.

13.7 Upstream or Downstream Imbalances – In the event that Transporter is assessed an

imbalance penalty or cash-out charge by an interconnecting pipeline(s) which charge has

been caused by any action of one or more Shippers, Transporter shall recover from the

Shippers causing such imbalance or charge an amount of penalty revenues equal to the

amount that Transporter has been assessed by the interconnecting pipeline(s).

13.8 Waiver – Transporter may waive its right to collect all or any portion of the charges

assessed Shipper under this section, provided that such waiver is granted in a

nondiscriminatory manner.