Caprock Pipeline Company

First Revised Volume No. 1

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Effective Date: 06/01/1997, Docket: RP97-139-001, Status: Effective

First Revised Sheet No. 13 First Revised Sheet No. 13 : Effective

Superseding: Original Sheet No. 13

4.12 Volume and Quality Determination - The measurements of

the quantity and quality of all gas delivered and purchased

hereunder shall be conducted in accordance with the following:

(A) Unit of Volume: The unit of volume for

measurement shall be one (1) cubic foot of gas. Such measured

volumes, converted to MCF, shall be multiplied by their Gross

Heating Value per cubic foot and divided by 1,000 to determine

Dth's received and delivered.

(B) Orifice Meter Volume Computations: Computations

of gas volumes from measurement data shall be made in accordance

with ANSI/API 2530 (AGA Report No. 3), Orifice Metering of

Natural Gas and Other Related Hydrocarbon Fluids, Second Edition,

dated September 1985, and any subsequent amendments or revisions.

Computation of Gas Volumes from data shall be in accordance with

AGA Measurement Committee Report No. 6 (AGA Report No. 6), dated

January 1971 and any subsequent amendments or revisions.

(D) Turbine Meter Volume Computations: Computations

of Gas Volumes from data shall be in accordance with AGA

Measurement Committee Report No. 7 (AGA Report No. 7), First

Revisions, dated November 1984, and any subsequent amendments or

modifications.

(E) Electronic Devices and Flow Computers Volume

Computations: Computation of Gas Volumes from data or devices

shall be in accordance with AGA Measurement Committee Report

No(s). 3, 5, 6, and 7 and any subsequent amendments or revisions.

(F) Temperature Measurement: The temperature of the

gas shall be determined by a recording thermometer or electronic

means so installed that it may record the temperature of the gas

flowing through the meters. If the parties do not consider the

installation of such a recording thermometer to be necessary,

other agreeable means of recording temperature may be used. The

average temperature to the nearest one degree (1ø) Fahrenheit,

obtained while gas is being delivered, shall be the applicable

flowing gas temperature for the period under consideration.

(G) Specific Gravity Measurement: At

least quarterly, the specific gravity of the gas shall be

determined at Caprock's option by an on-line chromatographic

device or a chromatographic gas analysis of a spot or continuous

gas sample. The specific gravity of the gas delivered hereunder

shall be determined to the nearest one-thousandth (0.001) and

shall be applied during the applicable quarter or time period for

the determination of gas volumes delivered.

(H) Adjustment for Supercompressibility: At

least quarterly, adjustments to measured gas volumes for the

effects of supercompressibility shall be made in accordance with

accepted AGA standards. Caprock shall obtain representative

carbon dioxide and