MarkWest Pioneer, L.L.C.

Original Volume No. 1

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

Original Sheet No. 97 Original Sheet No. 97

GENERAL TERMS AND CONDITIONS

(Continued)

25.7. Service Complaints. Customers are encouraged to resolve any disputes

informally with their designated customer representatives. A formal

complaint concerning any transportation services offered by Transporter

shall specifically state that it is a complaint filed pursuant to Commission

rules and shall be addressed to address listed in Section 25.6.

25.8. Transporter shall inform Shipper within 48 hours that the inquiry has been

received and inform Shipper of Transporter’s initial response to the inquiry

and proposed course of action. Each inquiry will be noted on the

transportation request log. Each inquiry shall be investigated, and, within

30 days of inquiry, Transporter shall inform Shipper in writing in of the

action, if any, taken in response to Shipper’s inquiry. Transporter shall

maintain a separate file for all shipper inquiries and Transporter’s

responses.