Markwest New Mexico, L. L. C.

Second Revised Volume No. 1

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Effective Date: 08/01/2008, Docket: RP08-409-000, Status: Effective

Original Sheet No. 123 Original Sheet No. 123 Invoices will be supported by adequate backup information to allow Shipper to review invoice calculations. In the event the delivered volumes reflected in a Transporter invoice differ from the volumes indicated by Shipper's check measuring equipment, then Shipper shall make payment to Transporter using the lower of the two volume totals, subject to adjustment as described in Section 9.2 below (following calculation of final volumes pursuant to Section 3.9). All taxes applicable to transportation shall be shown as a separate line item on each invoice for accounting purposes. Shipper shall make payment, at Transporter's option, either by mailing its check via U.S. mail to any address specified by Transporter, postage prepaid, or by bank transfer of funds to a bank account to be designated by Transporter. 9.2 Disputed Amounts If Shipper disputes the amount of any invoice for any reason, Shipper shall notify Transporter of the dispute within ten (10) Business Days after receipt of the invoice. If Shipper fails to notify Transporter of the dispute within ten (10) Business Days, the disputed invoice shall be paid in full according to the terms of the Transportation Agreement, but the payment shall be subject to adjustment upon final resolution of the dispute, with any refund to bear interest at one percent over the prime rate announced by The Index Bank as it may vary from time to time over the period that Transporter has possession of the money. Any refund due to Shipper under this section shall be due and payable fifteen (15) Days after the final resolution of the dispute. If Shipper notifies Transporter of the dispute within ten (10) Business Days of the receipt of the disputed invoice by Shipper, and if Shipper and Transporter are unable to resolve the dispute before the due date of the dispute invoice, Shipper shall pay only the undisputed portion of the disputed invoice on the due date. Shipper shall pay the portion of the disputed invoice, if any,