MarkWest Pioneer, L.L.C.

Original Volume No. 1

Effective Date: 04/01/2009, Docket: RP09-321-001, Status: Effective

First Revised Sheet No. 55 First Revised Sheet No. 55

Superseding: Original Sheet No. 55

GENERAL TERMS AND CONDITIONS

(Continued)

7.5 Maintenance of Creditworthiness/Suspension of Service – If Shipper’s credit

standing ceases to meet Transporter’s credit requirements during the period

of service, then Transporter has the right to require security as specified

herein.

7.5.1 If Transporter concludes that a Shipper is non-creditworthy,

Transporter shall provide written notice to Shipper within ten (10)

days after that determination is made. If requested by Shipper,

Transporter shall provide a written explanation of the reasons for

this determination. A Shipper may challenge Transporter’s

determination by providing a written rebuttal to Transporter’s

explanation within ten (10) days after the explanation is provided

by Transporter. Transporter shall respond to such a rebuttal in

writing within ten (10)days. Upon notification by Transporter that

Shipper no longer meets Transporter’s creditworthiness standards,

Shipper must, within ten (10) business days, pay for one (1) month

of service in advance to continue service. Any re-evaluation of

credit by Transporter in response to such a rebuttal by the Shipper

shall be based on the credit criteria set out in this section and

shall be performed as provided in this section.

7.5.2 If the Shipper has not satisfied the requirements of Section 7.5.1,

Transporter may immediately suspend service to Shipper.

7.5.3 If Shipper has not satisfied the requirements of this section,

Transporter may terminate service after 30 days notice to the

Commission and Shipper, consistent with section 154.602 of the

Commission’s regulations.

7.6 Shipper may continue to receive transportation service by providing one of

the following within 30 days of Transporter’s notification that Shipper no

longer meets Transporters creditworthiness standards: