Williams Natural Gas Company

Second Revised Volume No. 1

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

First Revised Sheet No. 145 First Revised Sheet No. 145 : Superseded

Superseding: Original Sheet No. 145

IPS RATE SCHEDULE

Interruptible Pooling Service

IPS-P Production Area

IPS-M Market Area

2. APPLICABILITY AND CHARACTER OF SERVICE (Cont'd)

(d) Pooling Shipper or another Shipper must nominate a corresponding

quantity of gas from the Production Area Pool to a transportation

agreement for delivery to delivery points on WNG's Production Area

Master Delivery Point list, the Production/Market Area interface or

for storage injections under an associated FSS or ISS agreement in

the Production Area; Pooling Shipper or another Shipper must

nominate a corresponding quantity of gas from the Market Area Pool

to a transportation agreement for delivery to delivery points on

WNG's Market Area Master Delivery Point list, to the Production

Area/Market Area interface, or for storage injections under an

associated FSS or ISS agreement in the Market Area.

(e) Pooling Shipper or another Shipper must provide priority ranking

for gas delivered to or received from the Production Area or Market

Area pool. If ranking is not provided, pro rata will be used.

(f) Nominations to the Production Area or Market Area pools will be

considered as interruptible for purposes of scheduling receipts on

to WNG's system.

(g) Imbalances between the actual quantity of gas received and the

quantity nominated to a pool will be cashed out at the end of each

month based on prices applicable to WNG in Gas Daily's "Daily Price

Survey", in the column titled "Absolute". WNG's selling price will

be the highest price shown for any day during the month and the

purchase price will be the lowest price shown for any day during

the month.

(h) The Production Area and Market Area Pools may not be listed as

primary firm receipt or delivery points under any service

agreement.