Williams Natural Gas Company

Second Revised Volume No. 1

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Effective Date: 05/01/1997, Docket: RP97-258-000, Status: Effective

First Revised Sheet No. 146 First Revised Sheet No. 146 : Superseded

Superseding: Original Sheet No. 146

IPS RATE SCHEDULE

Interruptible Pooling Service

IPS-P Production Area

IPS-M Market Area

3. RATE AND BILLING

(a) WNG will not assess a transportation charge or fuel and loss on

quantities nominated into the Production Area or Market Area pools.

Quantities withdrawn from storage under Rate Schedule FSS or ISS

Service Agreements and nominated to the Production Area or Market

Area pools will be subject to a Withdrawal Charge under the

applicable storage rate schedule. Quantities nominated from the

Production Area or Market Area pools as receipts under a Production

Area or Market Area transportation agreement, respectively, will be

assessed a transportation charge and fuel and loss under that

transportation agreement. Quantities nominated into storage from

the Production Area or Market Area pools will be assessed an

injection charge under the applicable storage rate schedule and a

charge for storage fuel and loss.

(b) WNG will charge a fee of $0.01 per Dth on transfers from a pooling

agreement with one Pooling Shipper to a pooling agreement with

another Pooling Shipper within either the Production Area or Market

Area pools. Such fee will be billed to the delivering Pooling

Shipper during each billing period. Transfers directly from the

Production Area pool to the Market Area pool or vice versa are not

permitted.

4. GENERAL TERMS AND CONDITIONS

The General Terms and Conditions of this FERC Gas Tariff are applicable

to this rate schedule except for the following provisions: Article 9.8,

Monthly Balancing; Article 10, Operational Flow Orders; Article 25, Gas

Research Institute RD&D Funding Unit; Article 26, FERC Annual Charge

Adjustment.