Westgas Interstate, Inc.

First Revised Volume No. 1

Effective Date: 08/01/1999, Docket: RP99-422-000, Status: Effective

Fourth Revised Sheet No. 29 Fourth Revised Sheet No. 29 : Effective

Superseding: Third Revised Sheet No. 29

GENERAL TERMS AND CONDITIONS

1. DEFINITIONS

1.1 "Btu" means one British thermal unit, which is the

amount of heat required to raise the temperature of one

pound of water one degree from 59 degrees to 60 degrees

Fahrenheit. "MMBtu" means one million Btu's. The standard

Btu is the International Btu, which is also called the

Btu(IT). For reporting purposes, BTU conversion factors

should be reported to not less than 3 decimal places and

Pressure Base conversion factors should be reported to not

less than 6 decimals places. For calculation purposes,

not less than 6 decimal places should be used for both

conversion factors.

1.2 "Cubic foot" means the volume of gas which would

occupy a space of one cubic foot at a temperature of 60

degrees Fahrenheit and at a pressure of 14.73 pounds per

square inch absolute.

1.3 "Contract demand" means the volume of gas set forth

from time to time on Exhibit A of the transportation

service agreement under Rate Schedule FT.

1.4 "Gas Day." Standard time for the gas day should be 9

a.m. to 9 a.m. (central clock time).

1.5 "Daily volume" means the volume of gas set forth from

time to time on Exhibit A of the transportation service

agreement under Rate Schedule IT.

1.6 "Delivery point" means a point where Transporter

delivers gas to or for the account of Shipper after

transportation.

1.7 "Dekatherm" or "Dth" means the quantity of heat

energy which is equivalent to 1,000,000 British Thermal

Units (MMBtu). One dekatherm of gas means the quantity of

gas which contains one dekatherm of heat energy, and will

be reported on a dry MMBtu (or Dth) basis. As used in

this tariff, related service agreements, statements and

invoices, MMBtu and Dth are considered synonymous. The

standard quantity for nominations, confirmation and

scheduling is dekatherms per gas day in the United States,

gigajoules per gas day in Canada and gigacalories (Gcs)

in Mexico. (For reference 1 dekatherm = 1,000,000 Btu's;

1 gigajoule = 1,000,000,000 joules; and 1 gigacalorie

= 1,000,000,000 calories.) For commercial purposes, the