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. 168 Original Sheet No. 168

MARKWEST PIONEER, L.L.C.

FORM OF SERVICE AGREEMENT

RATE SCHEDULE FT-2

Exhibit B (Continued)

Attachment A to Production Commitment Agreement No. ____

Under Rate Schedule FT-2 Between

MarkWest Pioneer, L.L.C. and ____________________________

Type of Production Commitment _____ Option 1 (Full Commitment)

_____ Option 2 (Partial Commitment)

Pre-existing Gas Sales Agreement(s) (for Option 1 Shippers only)

[List Pre-existing Gas Sales Agreement(s) here]

Map or Description of the Commitment Area (attach)