Williston Basin Interstate Pipeline Co.

Second Revised Volume No. 1

Effective Date: 03/21/1999, Docket: RP99-230-000, Status: Effective

Second Revised Sheet No. 751 Second Revised Sheet No. 751 : Effective

Superseding: First Revised Sheet No. 751

ELECTRONIC DATA INTERCHANGE

TRADING PARTNER AGREEMENT (Continued)

of data which is not a Document, a Functional Acknowledgement, an

electronic delivery mechanism error notification, or a time-stamp

receipt response or record (collectively "Data Communications")

shall have no force or effect between the parties. All Data

Communications shall be transmitted in accordance with the standards

and the published industry guidelines set forth in the Exhibit(s).

The Exhibit(s) to this Agreement is(are) attached hereto. Any

modification of the provisions contained in the body of this

Agreement will be effective as set forth in the Exhibit(s).

1.2 Third Party Service Providers

1.2.1 Data Communications will be transmitted electronically

to each party as specified in the Exhibit(s), either directly or

through any third party service provider ("Provider") with whom

either party may contract. Either party may modify its election

to use, not use or change a Provider upon 30 days prior written

notice to the other party.

1.2.2 Each party shall be responsible for the costs of any

Provider with whom it contracts, unless otherwise set forth in

the Exhibit(s). Each party shall be responsible for services

needed to carry out its responsibilities under this agreement.

1.2.3 Notwithstanding the acts or omissions of its Provider,

for purposes of this Agreement, each party is responsible for

transmitting, receiving, storing or handling Data Communications

to the extent required to effectuate transactions pursuant

to Section 2.

1.3 System Operations. Each party, at its own expense, shall provide

and maintain the equipment, software, services and testing necessary

to transmit Data Communications to, and receive Data Communications

from the parties' respective Receipt Computers.

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