Trunkline Gas Company

First Revised Volume No. 1

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Effective Date: 01/15/2000, Docket: RP00-138-000, Status: Effective

Second Revised Sheet No. 356 Second Revised Sheet No. 356 : Effective

Superseding: Sub First Revised Sheet No. 356

RATE SCHEDULE ISS (Continued)

INTERRUPTIBLE STORAGE SERVICE

FORM OF SERVICE AGREEMENT

ARTICLE 3 - RATES AND CHARGES

For the services provided or contracted for hereunder, Shipper

agrees to pay Trunkline the then-effective, applicable rates and charges

under Trunkline's Rate Schedule ISS filed with the Commission, as such

rates and charges and Rate Schedule ISS may hereafter be modified,

supplemented, superseded, or replaced generally or as to the service

hereunder. Trunkline reserves the right from time to time to

unilaterally file and to make effective any such changes in the terms or

rate levels under Rate Schedule ISS and the applicability thereof, the

General Terms and Conditions or any other provisions of Trunkline's

Tariff, subject to the applicable provisions of the Natural Gas Act and

the Commission's Regulations thereunder.

From time to time Shipper and Trunkline may agree in writing on a

level of discount of the otherwise applicable rates and charges

hereunder pursuant to the effective applicable provisions of Rate

Schedule ISS and subject to the Regulations and Orders of the

Commission. For example, Shipper and Trunkline may agree that a

specified discounted rate shall apply: (a) only to certain Quantities

under this Agreement; (b) only if specified Quantity levels are actually

achieved or only with respect to Quantities below a specified level; (c)

only during specified time periods; or (d) in a specified relationship

to the Quantities actually injected, withdrawn or stored (i.e., that the

rates shall be adjusted in a specified relationship to Quantities

actually injected, withdrawn or stored); provided, however, that any

such discounted rate set forth above shall be between the Maximum Rate

and Minimum Rate applicable to the service provided under this

Agreement. In addition, the discount agreement may include a provision

that if one rate component which was at or below the applicable Maximum

Rate at the time the discount agreement was executed subsequently

exceeds the applicable Maximum Rate due to a change in Trunkline's

Maximum Rates so that such rate component must be adjusted downward to

equal the new applicable Maximum Rate, then other rate components may be

adjusted upward to achieve the agreed overall rate, so long as none of

the resulting rate components exceed the Maximum Rate applicable to that

rate component. Such changes to rate components shall be applied

prospectively, commencing with the date a Commission order accepts

revised tariff sheets. However, nothing contained herein shall be

construed to alter a refund obligation under applicable law for any

period during which rates which had been charged under a discount

agreement exceeded rates which ultimately are found to be just and

reasonable. Any discount shall be effective only on a prospective basis

and as specified in the written agreement between Trunkline and Shipper.