Portland Natural Gas Transmission System

Second Revised Volume No. 1

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Effective Date: 08/01/2010, Docket: RP10-885-000, Status: Effective

First Revised Sheet No. 517 First Revised Sheet No. 517

Superseding: Original Sheet No. 517

ARTICLE X - CHANGE IN TARIFF PROVISIONS

Shipper agrees that Transporter shall have the unilateral right to

file with the Federal Energy Regulatory Commission or any successor regulating

authority any changes in any of the provisions of its Tariff, including any of

its Rate Schedules, or the General Terms and Conditions, as Transporter may

deem necessary, and to make such changes effective at such times as

Transporter desires and is possible under applicable law.