West Texas Gas, Inc.

First Revised Volume No. 1

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Effective Date: 05/01/1998, Docket: RP98- 25-005, Status: Effective

Original Sheet No. 12A Original Sheet No. 12A : Effective

GENERAL TERMS AND CONDITIONS

(Continued)

4. Measurement Equipment (Continued):

The heating value of the gas shall be determined by means of a

recording calorimeter, employing the Thomas principle of

calorimetry, located at or near each receipt point on Seller's

pipeline system or at any other point where there will be no

commingling thereafter of gas with that delivered by Buyer, or

by means of some other recognized method. The total Btu content

of the gas delivered during any given period shall be determined

by multiplying the total volumes of natural gas delivered during

such period by the average heating value of the gas for the same

period.

4.2 Check Measuring Equipment: Buyer may install, maintain

and operate, at its own expense, such check measuring