Wyoming Interstate Company, Ltd.

Second Revised Volume No. 2

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Effective Date: 04/12/2010, Docket: RP10-491-000, Status: Effective

Fifth Revised Sheet No. 41 Fifth Revised Sheet No. 41

Superseding: Substitute Fourth Revised Sheet No. 41

GENERAL TERMS AND CONDITIONS

(Continued)

2. MEASUREMENT (Continued)

2.5 Atmospheric Pressure. For the purpose of measurement, calculation

and meter calibration, the average absolute atmospheric (barometric)

pressure shall be based on the actual altitude of each point of

measurement irrespective of variations in natural atmospheric

pressure from time to time. In the event electronic computer

measurement is used, the absolute Gas pressure will be measured

directly, using an absolute pressure measuring device for continuing

input to the electronic computer.

2.6 Temperature. The temperature of the Gas shall be determined at the

points of measurement by means of a properly installed recording

thermometer of standard manufacture determined by Transporter in

exercise of its reasonable judgment to be installed in accordance

with the recommendations contained in ANSI/API 2530 First Edition

(Orifice Metering of Natural Gas). The arithmetic average of hourly

temperatures for each Day shall be used in computing temperatures of

the Gas during such Day. In the event electronic computer

measurement is used, average daily temperature will be computed as a

running average of data determined during each computer scan.

2.7 Determination of Heating Value and Specific Gravity. The Gross

Heating Value and specific gravity of the Gas may be determined by

on-line recording calorimeter and gravitometer or by recording

chromatograph. In the event a continuous Gas sampling device is

used, intervals mutually agreed upon should not be less than every

Month. For conventional chart measurement, the arithmetical average

of the hourly Gross Heating Value and specific gravity recorded

during periods of flow each Day by a recording calorimeter and

gravitometer or recording chromatograph, if installed, shall be

considered as the Gross Heating Value and specific gravity of the

Gas Delivered during each Day. In the event electronic computer

measurement is used, the determination of Gross Heating Value and

specific gravity from chromatograph or calorimeter and gravitometer

transducers shall input continuously into the computer for quantity

calculations. In the event a continuous Gas sampler is installed,

then the Gross Heating Value and specific gravity shall be

determined in the laboratory by chromatograph and/or running a

portion of test sample through a calorimeter and gravitometer.

Such determinations shall be considered as the Gross Heating Value

and specific gravity of all Gas Delivered during the applicable

period of sampling. All Gross Heating Value and specific gravity

determinations made with a chromatograph shall use physical Gas

constants for Gas compounds, as outlined in ANSI/API 2530 with any

subsequent amendments or revisions to which the Parties may

mutually agree.