MarkWest Pioneer, L.L.C.

Original Volume No. 1

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

Original Sheet No. 180 Original Sheet No. 180

Exhibit R-1 to the Capacity Release Transportation Service Agreement

between MarkWest Pioneer, L.L.C. (“Transporter”) and

__________________________ (“Replacement Shipper”)

dated _________________________.

Release Quantity: ____________________ Bid Rate: ______________________

Term: ________________________________

Releasing Shipper: _______________________________________________________

Commencement Date: ___________________ Expiration Date: _______________

Primary Points Meter Nos. Max. Quantity

______________________ __________ _____________________

Additional Conditions of Release:

_________________________________________________________________________

Notices shall be made to:

Transporter MarkWest Pioneer, L.L.C.

1515 Arapahoe Street

Tower 2, Suite 700

Denver, CO 80202-2126

(303) 925-9200

(303) 290-8769 (facsimile)

Replacement Shipper (contact person with address, including email, phone and fax):

____________________________________