Transwestern Pipeline Company, LLC

Third Revised Volume No. 1

Effective Date: 10/23/2006, Docket: RP06-604-000, Status: Effective

First Revised Sheet No. 104 First Revised Sheet No. 104 : Effective

Superseding: Original Sheet No. 104

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 Boyle's and

Charles' Laws for the measurement of gas under varying pressures and temperatures with deviation

therefrom as provided in Section 4.6 herein and shall be determined as follows:

4.1 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.

4.2 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 above, and by dividing the product by one

million (1,000,000).

4.3 The average absolute atmospheric pressure shall be determined for the point of receipt or

delivery.