Transwestern Pipeline Company

Second Revised Volume No. 1

Effective Date: 02/01/1993, Docket: RS92- 87-003, Status: Effective

1st Revised Sheet No. 56 1st Revised Sheet No. 56 : Effective

Superseding: Original Sheet No. 56

GENERAL TERMS AND CONDITIONS

(continued)

D. For measurement by turbine or orifice meters, the arithmetic average

of gas temperatures recorded during the periods of flow only shall be

deemed the gas temperature for the purpose of calculating transport

quantities. However, when computing quantities of gas measured by

displacement type meters, the gas temperature shall be deemed to be

the average monthly ambient temperature corresponding to each

calendar month as recorded and published as Local Climatological Data

by the U.S. Department of Commerce, Weather Bureau, for that weather

station nearest the actual point of receipt or delivery; or as may be

otherwise mutually agreed to by Operator and Transporter.

E. The specific gravity and total heating value of the gas to be

measured shall be determined by one of the following methods: (1) a

spot gas sample analyzed on a gas chromatograph with the frequency of

the sampling being as agreed to by Operator and Transporter, (2) use

of a continuous, proportional to flow, gas sampler and the sample

analyzed on a gas chromatograph, (3) by the continuous use of an "on

line" gas chromatograph, or (4) any other method agreed to by

Operator and Transporter. All chromatographic analysis are to be as

per GPA 2172 using factors from the latest edition of GPA 2145, as

may be amended from time to time.