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. 110 Original Sheet No. 110 3.4 Measurement at the Receipt Points - At the Receipt Points, Transporter will comply with the provisions for gas measurement set forth in the General Terms and Conditions of the tariffs of the Delivering Pipelines. Transporter's measurement equipment, which is operated by the Delivering Pipelines, will be used as the primary billing meters at the Receipt Points. 3.5 Measurement at the Delivery Points - Each item of equipment shall be calibrated to provide an accuracy of plus or minus five-tenths of one percent of full scale. 3.6 Resolving Differences at the Delivery Point(s) - If the testing and calibration performed at the Delivery Point(s) pursuant to Section 3.3 show that any item of equipment installed by Transporter does not conform to the accuracy requirements of Section 3.5, all previous readings of that item of equipment shall be corrected to zero error for any period which the equipment was known to be in error. If this period is not known, the correction shall be made for a period extending back one-half of the time elapsed since the last testing and calibration performed pursuant to Section 3.3. During any period when any item of equipment installed at the Delivery Point(s) by Transporter is inoperable or known to be in error, the measurements provided by the corresponding item of equipment installed by Shipper, if any, shall be used if determined to be accurate in accordance with Section 3.5. If neither item of equipment is operable or accurate, or available in the case of Shipper's equipment, the specification to be measured shall be determined by the parties hereto on the basis of the best data available using the first of the following methods which is feasible: (a) By correcting the error if the percentage of error is ascertainable by calibration, test, or mathematical calculations; or