Northern Border Pipeline Company

First Revised Volume No. 1

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Effective Date: 06/01/2003, Docket: RP00-403-004, Status: Effective

Substitute First Revised Sheet No. 260B Substitute First Revised Sheet No. 260B : Effective

Superseding: Original Sheet No. 260B

GENERAL TERMS AND CONDITIONS

10. NOMINATIONS/CONFIRMATIONS/SCHEDULING/INTERRUPTION OF SERVICE

(Continued)

10.6 Interruption of Service (Continued)

10.63 Service Reduction Due to an Operational Flow Order

(Continued)

(c) Action Taken by Company Prior to Issuance of OFO

Company shall first attempt to isolate the impact

of the operational problem by utilizing an OBA(s)

at or in the area of Company's system where the

problem is occurring. However, if the cumulative

operational imbalance(s) related to such OBA(s)

exceeds the cumulative imbalance tolerance level

agreed to by Company and the Interconnected

Party(ies), and neither the Interconnected

Party(ies) or the related Shippers are actively

addressing the problem, Company shall then issue

an OFO watch for such location. In the event

there is no agreed upon cumulative imbalance

tolerance level, then the cumulative imbalance

tolerance level shall be 10% of the Historical

Flow Quantity at such point.

Affected parties shall be directly notified of

the issuance of an OFO watch.

An OFO watch will state a period of time

affected Shipper(s) have to address such

condition with the Interconnected Party(ies)

and/or prepare alternative arrangements in the

event an OFO is issued.

(d) Issuance of OFO

If Company determines that the operational

problem detailed in the OFO watch has not been

adequately addressed within the time period

specified in such watch, Company shall then have

the right to issue an OFO.