MarkWest Pioneer, L.L.C.

Original Volume No. 1

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Effective Date: 04/01/2009, Docket: RP09-321-000, Status: Effective

Original Sheet No. 71 Original Sheet No. 71

GENERAL TERMS AND CONDITIONS

(Continued)

13.3. Contract Termination - Shipper shall coordinate with Transporter to reduce

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

13.3.1. For purposes of this section, Shipper’s Net Imbalance shall equal

the net sum of Shipper’s monthly imbalances remaining at contract

termination.

13.4. 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.

13.5. Unauthorized Overrun Charge – If Shipper exceeds its MDQ without approval of

the Transporter, Shipper shall pay a rate equal to twice the AOS rate set

forth on the Statement of Rates and Charges for each MMBtu of Gas taken in

excess of Shipper’s MDQ.

13.6. 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.