MarkWest Pioneer, L.L.C.

Original Volume No. 1

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

Original Sheet No. 171 Original Sheet No. 171

MARKWEST PIONEER, L.L.C.

FORM OF SERVICE AGREEMENT

RATE SCHEDULE IT

ARTICLE V

GOVERNMENTAL AUTHORIZATIONS

It is hereby agreed that transportation service under this Agreement shall be implemented

pursuant to applicable authorizations of the Commission.

ARTICLE VI

NOTICES

Unless otherwise provided herein, any notice, request or demand which either party desires

to serve upon the other regarding this agreement shall be in writing and shall be considered

as delivered when hand delivered or, if mailed by United States certified mail, postage

prepaid, three (3) business days after mailing or, if sent by facsimile transmission, when

receipt is confirmed by the equipment of the transmitting party; provided, if receipt of a

facsimile transmission is confirmed after normal business hours, receipt shall be deemed to

be the next business day. Such notice shall be given at the following addresses, or to such

other address as either party shall designate by notice in the manner provided herein:

(a) Transporter

MarkWest Pioneer, L.L.C.

1515 Arapahoe Street

Tower 2, Suite 700

Denver, CO 80202-2126

Attention: ___________________________________

(b) Shipper

______________________________________________