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. 112 Original Sheet No. 112 In the event gas is received into Transporter's pipeline system from an interconnect other than the Receipt Points defined herein, Shipper may request and, upon such request, Transporter shall be required to install an automatic sampling device to measure the hydrogen sulfide levels in the gas. The hydrogen sulfide content of the gas shall be determined in accordance with the Gas Processors Association Standard for such determination then in effect, and if there is no such standard in effect, by a method generally used and accepted in the industry and agreeable to both Transporter and Shipper. 3.9 Determination of Total Delivered MMBtu - The total number of MMBtus delivered shall be determined by multiplying the delivered gross calorific heating value, as determined in Section 3.8, by the total volume of gas as determined in Section 3.1. If the total MMBtu results obtained by use of Transporter's equipment, as specified in Section 3.1 and 3.8, differ by one percent or more from the results obtained by use of Shipper's check metering equipment, then Transporter and Shipper shall each be required to calibrate its measurement equipment. If such calibrations indicate that Transporter's measurement equipment is within the tolerance levels set forth in Section 3.5, then Transporter's measurement equipment shall continue to be used. If such calibrations indicate that Transporter's measurement equipment is not within the tolerance levels set forth in Section 3.5 and that Shipper's measurement equipment is within the tolerance levels set forth in Section 3.5, then Shipper's measurement equipment shall be used. If such calibrations indicate that neither parties' measurement equipment is within the tolerance levels set forth in Section 3.5, then the provisions of Section 3.6 shall be followed to resolve any measurement inaccuracies.