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. 23 Original Sheet No. 23

RATE SCHEDULE IT

(Continued)

(a) The applicable Recourse or Negotiated Commodity Charge;

(b) The Annual Charge Adjustment (ACA) set forth on the Statement of

Rates and Charges;

(c) The Fuel and Gas Loss Retention Percentage set forth in the

Statement of Rates and Charges; and

(d) Any other charge or surcharge mutually agreed by Transporter and

Shipper or allowed by the Commission as set forth in the Statement

of Rates and Charges.

4. MONTHLY BILL

The Monthly Bill for IT service shall be equal to:

4.1. Commodity Charge: The applicable commodity rate determined under Section 3

of this Rate Schedule multiplied by the MMBtu’s of Gas scheduled for receipt

pursuant to Shipper’s IT Agreement during the billing month.

4.2. Other Charges: The ACA charge and any other applicable surcharges in the

Statement of Rates and Charges multiplied by the applicable quantities

scheduled for Shipper during the billing month; and

4.3. New Facilities Charge: When applicable, a charge will be established

pursuant to Section 20 of the GT&C.

4.4. Fuel and Gas Losses: Notwithstanding other sections of this Rate Schedule,

Transporter shall retain the quantity of gas required for Fuel and Gas

Losses associated with Transporter’s provision of transportation service

pursuant to this Rate Schedule. The quantity of gas retained by Transporter

for Fuel and Gas Losses shall be equal to the quantity of gas scheduled for

receipt for Shipper during the billing month, multiplied by the applicable

Fuel and Gas Loss Retention Percentage on the Statement of Rates and Charges

of this Tariff.