MarkWest Pioneer, L.L.C.

Original Volume No. 1

 Contents / Previous / Next / Main Tariff Index

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

Original Sheet No. 184 Original Sheet No. 184

MARKWEST PIONEER, L.L.C.

FORM OF RELEASE REQUEST

Transporter’s Website to the extent it is incomplete or fails to conform in any

manner to the requirements of Transporter’s Tariff. Releasing Shipper, by the

signature of its authorized representative, represents and certifies to Transporter

that (1) the individual signing below is authorized to sign this Release Request for

Releasing Shipper; (2) the information above is true, complete and correct; (3)

Releasing Shipper agrees irrevocably to release the transportation rights described

herein on the terms and conditions set forth herein if this Release Request is

accepted by a Bidder to the successful Bidder; and (4) if this Release Request

includes a Pre-arranged Bidder, the Pre-arranged Bidder has agreed irrevocably to

accept the transportation rights described herein on the terms and conditions

set forth herein.

Submitted this _____ day of _______________, 20___.

__________________________________________________

(Shipper)

By: ______________________________________________

Title: ___________________________________________