Western Gas Interstate Company

Fourth Revised Volume No. 1

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Effective Date: 04/01/1996, Docket: CP96- 81-006, Status: Effective

Original Sheet No. 205 Original Sheet No. 205 : Effective

GENERAL TERMS AND CONDITIONS

(continued)

(b) The average absolute atmospheric pressure

shall be assumed to be thirteen (13.0) pounds

to the square inch, irrespective of actual

elevation or location of the Delivery Point

or Receipt Point above sea level or variations

in such atmospheric pressure from time to time.

(c) The temperature of the gas passing the meters

when necessary for computing gas quantities,

shall be determined for any day by the

continuous use of a recording thermometer so

installed that it may properly record the

temperature of the gas flowing through the

meters. The arithmetic average of the

temperature recorded each day shall be used

in computing gas quantity, or instantaneous

temperature measurements may be applied to

metering instruments for quantity

computation, or an assumed temperature of 60

degrees Fahrenheit may be used.

(d) The specific gravity of the gas delivered

shall, be determined by the use of spot tests

with an instrument of standard manufacture

acceptable in the industry. The specific

gravity of the gas delivered shall be

determined with such reasonable frequency as

is found expedient in practice but not less

frequently than once each six months.

(e) The deviation of the gas from Ideal Gas Laws

shall be calculated according to the

recommendations of the American Gas

Association in the Measurement Committee

Report, No. 3 entitled "Orifice Metering of

Natural Gas, April 1955," as may be amended

or modified from time to time, or any other

method or methods mutually agreed upon.

(f) The heating value shall be determined by

using a suitably located acceptable

calorimeter, or calculation from fractional

analysis, or methods outlined in A.G.A. Gas

Measurement Committee Report No. 5, as may be

amended or modified from time to time, or

other mutually accepted methods.