Southern Natural Gas Company

Seventh Revised Volume No. 1

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Effective Date: 04/01/1999, Docket: RP98-363-000, Status: Effective

First Revised Sheet No. 89 First Revised Sheet No. 89 : Effective

Superseding: Original Sheet No. 89

RATE SCHEDULE ISS

Interruptible Storage Service

(Continued)

Section 2(c) above. Subject to Section 8.3 of the General Terms and

Conditions, COMPANY shall not change the quantities of gas it will

withdraw from Storage on SHIPPER'S behalf during any day of service

except upon four (4) hour's prior notice to SHIPPER.

(d) SHIPPER may have gas withdrawn from Storage only to the extent of

SHIPPER'S estimated Storage Inventory; provided, however, that if

SHIPPER has Storage Inventory in its CSS storage account, COMPANY

shall transfer automatically sufficient Storage Inventory to

support SHIPPER'S ISS withdrawal for that day of ISS service.

(e) The withdrawal of gas by COMPANY and the receipt of gas for

SHIPPER'S account from Storage shall be performed at hourly rates as

constant as operationally feasible throughout the day and the parties shall

use their best efforts to achieve such uniform hourly rates of flow.

7. OTHER CONDITIONS OF SERVICE

(a) Requests for service under this Rate Schedule shall be provided in writing

to COMPANY in the format set forth in Appendix B to the General

Terms and Conditions to the attention of the Transportation Services

Department, Post Office Box 2563, Birmingham, Alabama 35202, and shall

contain all of the information required on such form to be deemed a valid

request. SHIPPER further agrees to provide such information as

COMPANY may require from time to time for purposes of filing reports of

SHIPPER'S storage service with regulatory or governmental agencies.