Transwestern Pipeline Company

Second Revised Volume No. 1

Effective Date: 04/01/1997, Docket: RP97- 18-003, Status: Effective

Seventh Revised Sheet No. 64 Seventh Revised Sheet No. 64 : Effective

Superseding: Sixth Revised Sheet No. 64

GENERAL TERMS AND CONDITIONS

(continued)

7.4 Errors in Billing

No prior period adjustment (PPAs) shall be made unless the request for the

adjustment is made within six (6) months of the production month. There will

be a three (3) month rebuttal period. This time limitation shall not apply in

the case of deliberate omission or misrepresentation or mutual mistake of

fact, or to rate changes required by governmental authorities having

jurisdiction. Parties' other statutory or contractual rights shall not

otherwise be diminished by this provision.

Interest computed at the same rate and in the same manner as prescribed for

pipeline refunds as set forth in Section 154.67(c)(2) of the Federal Energy

Regulatory Commission's Regulations under the Natural Gas Act shall be

included in adjusting errors resulting in excessive billings to Shipper,

provided such errors are not occasioned by mutual misinterpretation by both

Shipper and Transporter of quantities or other billing information.

7.5 Delay In Presentment of Invoice

In the event Transporter's invoice is dated after the 9th business day of the

month and a Shipper that is a Measurer was responsible for Transporter's

delay in presenting such bill(s), Shipper shall pay Transporter by wire

transfer of federal funds, unless otherwise agreed, on or before the 20th day

of the month.