National Fuel Gas Supply Corporation

Third Revised Volume No. 1

Effective Date: 04/01/1997, Docket: RP97-201-000, Status: Effective

Third Revised Sheet No. 78 Third Revised Sheet No. 78 : Superseded

Superseding: Second Revised Sheet No. 78

IAS RATE SCHEDULE

INTERRUPTIBLE ADVANCE SERVICE

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

2.2 Service hereunder shall consist of the advance of gas by Transport-

er, up to the Maximum Advance Quantity specified in the IAS Service

Agreement, the delivery of such gas into Transporter's transmission

facilities for subsequent transportation pursuant to the EFT, IT or

FT Rate Schedule, and the acceptance at the receipt point designat-

ed in the IAS Service Agreement of the quantity advanced by

Transporter hereunder.

2.3 Shipper shall be required to return the sum of (i) the quantity of

gas advanced by Transporter from storage fields utilized by

Transporter, which quantity shall include quantities retained by

Transporter during the subsequent transportation of such gas by

Transporter, and (ii) a quantity of gas equal to the product ob-

tained by multiplying the quantity of gas described in clause (i)

hereof by two (2) times the percentage set forth on Sheet No. 6 as

"surface operating allowance."

2.4 Shipper may nominate for the return of advanced gas at any time,

subject to Section 13 of the General Terms and Conditions of this

Tariff, and Transporter shall accept such gas to the extent it has

capacity to do so. The voluntary return of advanced gas hereunder

shall have a priority of service equal to service under the IT Rate

Schedule.

2.5 Shipper must return the quantities of gas specified in Section 2.3

hereof within forty eight (48) hours of receipt of notification

from Transporter.

2.6 An IAS Service Agreement with a primary term of one year or longer

shall continue in effect beyond the expiration of the primary term

until terminated by either party upon six (6) months written notice

to the other.

2.7 A Shipper receiving service under this IAS Rate Schedule shall not

lose priority for purposes of this Section by the renewal or

extension of term of that service.