Williston Basin Interstate Pipeline Co.

Second Revised Volume No. 1

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Effective Date: 04/01/1999, Docket: MT99- 12-000, Status: Effective

Third Revised Sheet No. 243 Third Revised Sheet No. 243 : Effective

Superseding: Second Revised Sheet No. 243

GENERAL TERMS AND CONDITIONS (Continued)

15. BALANCING AND NOMINATION VARIANCE PROCEDURES

15.1 For purposes of this Section 15, imbalance shall mean the

cumulative difference during a month between the actual receipt

quantities, net of any fuel reimbursement provided in-kind, and

actual quantities of gas delivered under a transportation Service

Agreement up to the date that the determination of the imbalance

is made (Eligible Imbalance).

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