Williston Basin Interstate Pipeline Co.

Second Revised Volume No. 1

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

Second Revised Sheet No. 759 Second Revised Sheet No. 759 : Effective

Superseding: First Revised Sheet No. 759

ELECTRONIC DATA INTERCHANGE

TRADING PARTNER AGREEMENT (Continued)

4.9 Assignment. This Agreement may not be assigned or

transferred by either party without the prior written approval of

the other party, which approval shall not be unreasonably

withheld; provided, any assignment or transfer, whether by merger

or otherwise, to a party's affiliate or successor in interest

shall be permitted without prior consent if such party assumes

this Agreement.

4.10 Waivers. No forbearance by any party to require

performance of any provisions of this Agreement shall constitute

or be deemed a waiver of such provision or the right thereafter

to enforce it.

4.11 Counterparts. This Agreement may be executed in any

number of original counterparts all of which shall constitute one

and the same instrument.

4.12 Reference Glossary. This section lists each defined

term in this Agreement and cross references that term to its

definition in the Agreement.

DEFINED TERM WHERE DEFINED

Agreement Header

Data Communications Section 1.1

Digital Signature Section 1.5

Documents Section 1.1

Electronic Data Interchange, EDI Recital

Functional Acknowledgment Section 2.3.1

parties Header

Provider Section 1.2.1

Receipt Computer Section 2.1.2

Response Document Section 2.3.4

Signed Documents Section 3.5.2

time-c Section 2.1.1

Uniform Resource Locator, URL Section 2.1.2

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