Williston Basin Interstate Pipeline Co.

Second Revised Volume No. 1

Effective Date: 08/01/1998, Docket: RP98-253-000, Status: Effective

First Revised Sheet No. 728 First Revised Sheet No. 728 : Effective

Superseding: Original Sheet No. 728

OPERATIONAL BALANCING AGREEMENT (Continued)

4.2 Termination Date - This Agreement shall continue in full

force and effect until canceled effective the first day of any month

by either Party upon 30 days prior written notice.

4.3 Termination Obligations - Termination of this Agreement

shall not relieve the Parties of the obligation to eliminate any

Cumulative Imbalance Quantity existing on the date of termination.

Any such quantity shall be corrected as soon as possible but no later

than 60 days after termination.

ARTICLE V

OTHER OPERATING PROVISIONS

5.1 Daily Nominations - Unless otherwise agreed, the Party

owing gas under this Agreement shall make daily nominations by

telephone or facsimile to the other Party to verify deliveries of the

Cumulative Imbalance Quantity makeup gas to be tendered at the POI(s)

for the next day. Nominations shall include both anticipated volumes

and thermal content at the POI(s). Such nominations shall be

confirmed by a mutually agreeable method.

5.2 Operational Integrity - Nothing in Article II shall limit

either Party's right to take action as may be required to adjust

receipts and/or deliveries of gas in order to alleviate conditions

which may threaten the integrity of its system.

ARTICLE VI

NOTICES

6.1 Notices and Statements - Any notice or statement provided

for in this Agreement shall be in writing and shall be considered as

having been given if delivered personally or if mailed by United

States mail, postage prepaid, to the following addresses,

respectively:

(The rest of this sheet has been intentionally left blank.)