High Island Offshore System, L.L.C.

Third Revised Volume No. 1

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Effective Date: 10/01/2009, Docket: RP09-487-001, Status: Effective

Substitute Third Revised Sheet No. 54 Substitute Third Revised Sheet No. 54

Superseding: Second Revised Sheet No. 54

RATE SCHEDULE IT

INTERRUPTIBLE TRANSPORTATION SERVICE

(Continued)

4. RATES AND CHARGES

4.1 Transportation Charge. Shipper agrees to pay HIOS an amount each month

equal to the transportation charge determined as follows:

The transportation charge shall be the sum of the product of the

monthly volumes of gas expressed in Dth received by HIOS from Shipper,

or for the account of Shipper, at the Points of Receipt set forth in

Exhibits A and B of the Transportation Agreement, and HIOS' effective

Long Haul or Short Haul interruptible transportation rate per Dth, as

applicable, as set forth on Sheet No. 10 of this Tariff.

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

HIOS an amount equal to the overrun charge determined as follows:

The overrun charge shall be the sum of the products of the volumes of

gas expressed in Dth received by HIOS from Shipper, or for the account

of Shipper, at each Point of Receipt set forth in Exhibits A and B of

the Transportation Agreement during any day, which are in excess of the

Maximum Daily Volume (MDV) for such Point of Receipt, and HIOS'

effective Long Haul or Short Haul overrun rate per Dth, as applicable,

as set forth on Sheet No. 10 of this Tariff.