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. 127 Original Sheet No. 127 Identify discrete Shipper(s) whose action(s) require Transporter to issue an OFO(s) and Transporter will limit the applicability of the OFO(s) to such Shipper(s). Notwithstanding the foregoing, if Transporter is unable to identify discrete Shipper(s) whose action(s) require issuance of an OFO, any OFO will be applicable to all Shippers on the affected Pipeline facilities. 12.2 Circumstances Under Which an OFO May be Issued -- Transporter may issue an OFO in any circumstance which would, in Transporter's reasonable judgment, impair Transporter's ability to receive or deliver Quantities of Gas in accordance with its service obligations including, but not limited to, when: (a) operating pressures are significantly less than or greater than normal system operating pressures despite Transporter's efforts to maintain normal pressures, and a further decline or increase in operating pressures would impair Transporter's ability to receive or deliver scheduled Quantities of Gas; (b) a Shipper fails to maintain receipts or deliveries as required in this Tariff; (c) unscheduled pipeline maintenance and repairs affect capacity. 12.3 Notices If Transporter is required to issue an OFO, Transporter will issue a notice or email the notice to all affected Shippers, with an explanation of the necessity of such order, the Shipper(s) to which the order is directed, and the anticipated duration of such order. To the extent discrete Shipper(s) are not identified in any notice of an OFO, such order will be applicable to all Shippers. Transporter will issue or email any notice of an OFO as far in advance of the effective date/time of the OFO as is operationally feasible, subject to Transporter's need to protect the integrity of the pipeline facilities. Transporter will