Northern Natural Gas Company

Fifth Revised Volume No. 1

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Effective Date: 09/24/2006, Docket: RP06-512-000, Status: Effective

Second Revised Sheet No. 454 Second Revised Sheet No. 454 : Superseded

Superseding: First Revised Sheet No. 454

SYSTEM MANAGEMENT SERVICE AGREEMENT

Rate Schedule SMS

Page 3 of 5

TERMS AND CONDITIONS

SECTION 1. MAXIMUM DAILY QUANTITY

The Daily SMS Contract Quantity (SMSQ) shall be the maximum positive

or negative variance that Shipper may vary between daily scheduled and

actual quantities of natural gas delivered to the delivery points

under the Corresponding Throughput Service Agreement without being

subject to Delivery Point Variance Charges. The SMSQ for each

delivery point is set forth on Appendix A.

SECTION 2. TERMINATION

Termination of this Agreement shall not relieve Shipper of the

obligation to pay money due hereunder to Northern.

SECTION 3. GENERAL

3.1 This Agreement in all respects shall be subject to the applicable

provisions of Rate Schedule TF, TFX, LFT, and GS-T and the "GENERAL

TERMS AND CONDITIONS" contained in Northern's FERC Gas Tariff, as may

be revised from time to time.