Westgas Interstate, Inc.

First Revised Volume No. 1

Effective Date: 06/01/1997, Docket: RP97-163-006, Status: Effective

2 Sub First Revised Sheet No. 49B 2 Sub First Revised Sheet No. 49B : Effective

Superseding: Original Sheet No. 49B

GENERAL TERMS AND CONDITIONS

(Continued)

10. BILLING AND PAYMENT

10.1 On the ninth (9th) Business Day of each Month or

before the 15th day of each month, whichever is later,

Transporter shall render or furnish to Shipper a statement

of the transportation charge in effect and of the total

payment due for the transportation of gas during the

preceding month (including any other applicable charges).

Transporter shall provide a schedule showing volumes of

gas (in Mcf) and heat content (in MMBtu) received and

delivered, including equivalent volumes, unaccounted-for

gas, gas vented, and any imbalance under 8 of these

General Terms and Conditions. Transporter may furnish an

estimated statement and make appropriate adjustments in

the statement rendered for the next succeeding month.

(a) Imbalance statements should be generated at the

same time or prior to the generation of the

transportation invoice.

(b) The imbalance statement should be rendered prior

to or with the invoice, and the transportation

invoice should be prepared on or before the 9th

business day after the end of the production month.

Rendered is defined as postmarked, time stamped, and

delivered to the designated site.

10.2 When information necessary for billing purposes is in

the control of the Shipper, Shipper shall furnish such

information to Transporter on or before the 10th day of

the month with respect to deliveries of gas during the

previous month

10.3 Shipper and Transporter shall have the right to

examine, at reasonable times, books, records, and charts

of the other to the extent necessary to verify the

accuracy of the statement, charge, or computation made

under or pursuant to any of the provisions.

10.4 Prior period adjustment time limits should be 6

months from the date of the initial transportation invoice

and 7 months from date of initial sales invoice with a 3-

month rebuttal period, excluding government-required rate

changes. This standard shall not apply in the case of

deliberate omission or misrepresentation or mutual mistake

of fact. Parties' other statutory or contractual rights

shall not otherwise be diminished by this standard.