West Texas Gas, Inc.

First Revised Volume No. 1

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

First Revised Sheet No. 11 First Revised Sheet No. 11 : Effective

Superseding: Original Sheet No. 11

GENERAL TERMS AND CONDITIONS

(Continued)

2.2 Specific Gravity: The gas delivered by Seller to Buyer

shall not have a specific gravity greater than 0.77 or less than

0.625 when compared with dry air at the same temperature and

pressure, air being taken as 1.0; provided, however, the specific

gravity may vary beyond such limits if approved by Buyer.

3. Measurement:

3.1 Unit of Volume: The unit of volume for purposes of sales and

billing shall be one (1) dth. The number of dth delivered shall be

determined by multiplying the number of Mcf of gas delivered by the Heat

Content of such gas in Btu per cubic foot, and multiplying that product

by 0,001. The unit of volume for purpose of measurement shall be 1,000

cubic feet of gas at a base temperature of 60 degrees Fahrenheit and an

absolute pressure of 14.65 pounds per square inch. The readings and

registration of the metering equipment hereinafter provided for shall

be computed in terms of such volume.

3.2 Orifice Meter Computations: For meters of the orifice type, the

volume of gas measured shall be computed in accordance with the

specifications published April 1955 as Gas Measurement Committee Report

No. 3 of the American Gas Association and any modifications and

amendments thereto. Factors required in the computations to be made

in accordance with such Report No. 3 shall be determined from the

following information:

(a) Flowing Temperature: The temperature of the natural gas flowing

through the meter shall be obtained by the use of a recording

thermometer. The average temperature recorded each day while the meter

is in service shall be used in computing measurements.

(b) Deviation from Boyle's Law: Deviation from Boyle's Law shall be

verified at least once each year, or oftener if found necessary in

practice. Tests shall be made in a manner and with apparatus approved

by the United States Bureau of Mines or by such other apparatus as is

satisfactory to Buyer and Seller.

determined monthly, or oftener if found necessary in practice. If gas

supplied by Seller to Buyer is secured from more than one source of

supply, the specific gravity shall be obtained by the use of a

continuous gas sampler or a recording gravitometer.