High Island Offshore System, L.L.C.

Third Revised Volume No. 1

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Effective Date: 04/07/1999, Docket: GT99- 17-000, Status: Effective

Original Sheet No. 182 Original Sheet No. 182 : Effective

FORM OF OPERATIONAL BALANCING AGREEMENT

(Continued)

The Parties' signatures below will evidence their agreement to this Operational

Balancing Agreement.

_____________________________ HIGH ISLAND OFFSHORE SYSTEM, L.L.C.

By __________________________ By __________________________

Accepted and agreed to this _____ day of _________________, ____.