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. 181 Original Sheet No. 181

Exhibit R-1

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

____________________________________

____________________________________

____________________________________

____________________________________

Signature:

______________________________________

For: _________________________________

(Replacement Shipper)

Name: ________________________________

Title: _______________________________

Date: ________________________________