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. 118 Original Sheet No. 118 Shipper agree that Shipper shall continue to serve as Point Operator at the Receipt Points for all gas quantities transported under such Agreement, and that Transporter shall provide all necessary notices to the Delivering Pipelines to effectuate such designation. Such designation of Shipper as Point Operator shall continue in full force and effect throughout the term of such Agreement, provided that Shipper remains the only Shipper on Transporter's pipeline. In the event Transporter subsequently begins transporting gas over the pipeline for other shippers, subject to any limitations set forth in such Agreement, Transporter shall take over the responsibilities of Point Operator at the Receipt Points, but shall coordinate its activities so as not to impair the nomination and balancing of the existing Shipper's gas quantities transported under the Agreement with such Shipper. 4.8 Imbalances - The quantities of gas tendered at the Receipt Point(s) and the quantities of gas delivered at the Delivery Point(s) shall remain in continuous balance or as near thereto as practical. In the event the quantity of gas tendered at the Receipt Point(s) and the quantity of gas taken at the Delivery Point(s) are not equal, a condition of imbalance shall exist. If Transporter or Shipper determines that an imbalance exists, both Transporter and Shipper shall use diligent efforts to correct the imbalance as soon as practical. Transporter will net Shipper's imbalances on a monthly basis across all of Shipper's Transportation Agreements. Shipper may trade any imbalances incurred under this Section 4 with other Shippers on Transporter's system, provided the imbalances to be traded are off-setting. Trades will be deemed completed upon notification to Transporter. 4.9 Shipper and Transporter will comply with the nomination provisions set forth in the tariffs of the Delivering Pipelines, as such procedures may be reasonably revised from time to time to account for operational changes.