High Island Offshore System, L.L.C.

Third Revised Volume No. 1

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Effective Date: 10/01/2007, Docket: RP06-540-004, Status: Effective

Fourth Revised Sheet No. 4 Fourth Revised Sheet No. 4 : Effective

Superseding: Substitute Third Revised Sheet No. 4

PRELIMINARY STATEMENT

1. In General

High Island Offshore System ("HIOS") is a natural gas company engaged in the

business of transporting natural gas and operating in the federal domain,

offshore Louisiana and offshore Texas.

HIOS shares no operating personnel or facilities with any of its affiliated

marketing or brokering companies.

2. Transportation Agreement

2.1 The Transportation Agreement contained in HIOS' F.E.R.C. Gas Tariff,

Third Revised Volume No. 1, and designated for use under transportation

Rate Schedule FT-1, sets forth the terms and conditions of firm service

under that rate schedule. The Transportation Agreement under Rate

Schedule FT-1 shall be used in all instances where HIOS enters into a new

agreement to perform firm, FT-1 transportation service.

2.2 The Transportation Agreement contained in HIOS' F.E.R.C. Gas Tariff,

Third Revised Volume No. 1, and designated for use under transportation

Rate Schedule FT-2, sets forth the terms and conditions of firm service

under that rate schedule. The Transportation Agreement under Rate

Schedule FT-2 shall be used in all instances where HIOS enters into a new

agreement to perform firm, FT-2 transportation service.

2.3 The Transportation Agreement contained in HIOS' F.E.R.C. Gas Tariff,

Third Revised Volume No. 1, and designated for use under transportation

Rate Schedule IT, sets forth the terms and conditions of interruptible

service under that rate schedule. The Transportation Agreement under

Rate Schedule IT shall be used in all instances where HIOS enters into

a new agreement to perform interruptible transportation service.