Transwestern Pipeline Company

Second Revised Volume No. 1

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

4th Revised Sheet No. 55 4th Revised Sheet No. 55 : Effective

Superseding: 3rd Revised Sheet No. 55

GENERAL TERMS AND CONDITIONS

(Continued)

4. MEASUREMENT

Unless otherwise agreed to by Transporter and Operator, Transporter shall

perform the measurement of the quantities of gas received into or

delivered from an interconnect point on Transporter's system.

The methods of computing measured quantities shall be: (1) for orifice

meters, in accordance with the recommendations set forth in ANSI/API

2530, approved May 1985, or, alternatively, AGA-3, or as such

recommendations may be amended from time to time, (2) for any gas measured

by displacement or turbine meters, the methods of computation shall be in

accordance with the procedures outlined in the latest addition of AGA Gas

Measurement Manual, Part 7 "Measurement Calculations and Data Gathering",

or as such manual may be amended from time to time.

The quantities of gas received or delivered hereunder shall be measured

according to Boyles's and Charles' Laws for the measurement of gas under

varying pressures and temperatures with deviation therefrom as provided in

paragraph (F) of this section, and shall be determined as follows:

A. The unit of volume for the purpose of measurement shall be one (1)

cubic foot of gas at a base temperature of sixty (60) degrees

Fahrenheit, and at a pressure base of fourteen and seventy-three

hundredths (14.73) pounds psia.

B. The unit of measurement for the purpose of billing shall be one (1)

dekatherm (dth) consisting of one million (1,000,000) British Thermal

Units. The number of dekatherms delivered shall be determined by

multiplying the number of cubic feet of gas delivered, measured on

the measurement basis hereinafter specified, by the total heating

value of such gas, in British Thermal Units per cubic foot, as

defined in Section 1.13 above, and by dividing the product by one

million (1,000,000).

C. The average absolute atmospheric pressure shall be determined for the

point of receipt or delivery.