U-T Offshore System, L.L.C.

Third Revised Volume No. 1

Effective Date: 06/01/1997, Docket: RP97-146-001, Status: Effective

Second Revised Sheet No. 21 Second Revised Sheet No. 21 : Superseded

Superseding: First Revised Sheet No. 21

RATE SCHEDULE IT

INTERRUPTIBLE TRANSPORTATION SERVICE

1. AVAILABILITY

This rate schedule is available to any party (Shipper) in the U-T Offshore System

(U-TOS) for the transportation of gas on an interruptible basis, subject to available

capacity in accordance with Section 7.8 of the General Terms and Conditions, where:

(1) the Shipper has demonstrated, to U-TOS'reasonable satisfaction, that it is

creditworthy in accordance with Section 5 of the General Terms and Conditions; (2) the

Shipper has executed a Transportation Agreement with U-TOS for interruptible service;

and (3) the Shipper has become a party to the "Gas Allocation Agreement".

2. APPLICABILITY AND CHARACTER OF SERVICE

2.1 This rate schedule shall apply to all natural gas transported under a

Transportation Agreement executed with U-TOS for interruptible service under

this Rate Schedule.

2.2 Pursuant to this rate schedule, U-TOS will transport gas for Shipper up to the

Maximum Daily Quantity (MDQ) specified in the transportation agreement. Shipper

may tender gas to U-TOS at the Points of Receipt specified in the agreement, and

U-TOS shall receive such gas at the Points of Receipt and redeliver an

Equivalent Volume for the account of Shipper at the Point of Delivery specified

in the agreement. If at any time, the capacity in U-TOS is insufficient to

transport all of Shipper's nominations as well as nominations of all other

Shippers on U-TOS, U-TOS will allocate capacity among all shippers in accordance

with subsection 7.8 of Section 7 of the General Terms and Conditions.

3. GENERAL TERMS AND CONDITIONS

The General Terms and Conditions of this Tariff are applicable to this Rate Schedule.

4. RATES AND CHARGES

4.1 Transportation Charge. Shipper agrees to pay U-TOS an amount each month equal

to the transportation charge determined as follows:

The transportation charge shall be the product of the monthly volumes of gas,

expressed in Dth, received by U-TOS from Shipper, or for the account of Shipper,

at the Points of Receipt set forth in Exhibit A of Transportation Agreement, and

U-TOS' effective interruptible transportation rate per Dth, as set forth on

Sheet No. 4 to U-TOS' F.E.R.C. Gas Tariff, Third Revised Volume No. 1.

4.2 Minimum Monthly Bill. None

4.3 Authorized Overrun. In addition to the charges specified above, Shipper agrees,

subject to Section 8 of the General Terms and Conditions, to pay U-TOS an amount

equal to the overrun charge determined as follows:

The overrun charge shall be the product of the volumes of gas, expressed in Dth,

received by U-TOS from Shipper, or for the account of Shipper, at each Point of

Receipt set forth in Exhibit A of the Transportation Agreement during any day,