High Island Offshore System, L.L.C.

Third Revised Volume No. 1

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

Original Sheet No. 85 Original Sheet No. 85 : Effective

GENERAL TERMS AND CONDITIONS

(Continued)

including low temperature wellhead separation units, prior

to the delivery of gas to HIOS hereunder.

Nothing contained herein shall be construed as giving HIOS

the right to extract liquefiable hydrocarbons except those

hydrocarbons which are necessarily removed in any cleaning

process required in the transmission of the Gas in its

pipeline system.

4.2 Heating Value. The Heat Content of the Gas delivered at the

points of receipt and the points of delivery set forth in

the Transportation Agreement shall not be less than 967 Btu

per cubic foot when determined on a dry basis. The Heat

Content of the Gas received at each point of receipt, and

the Heat Content of the Gas delivered at each point of

delivery shall be determined, at least monthly using

continuous sampling at the northern terminus of the

System and at each other offshore point of measurement by

use of a continuous sampler or other methods mutually agreed

upon by Transporter and Shipper. For the purposes of

scheduling receipts and deliveries, the Heat Content of the

Gas so determined at each such point of measurement shall be

deemed to remain constant for such point until the next

determination.

4.3 Freedom from Objectionable Matter. The gas received and

delivered:

4.3(a) Shall be commercially free from dust or other solid

or liquid matter which might interfere with its

merchantability or cause injury to or interference

with proper operation of the lines, regulators,

meters, and other equipment of HIOS;

4.3(b) Shall not contain more than one grain of hydrogen

sulphide per 100 cubic feet of gas, as determined

by methods prescribed in Standards of Gas Service,

Circular of the National Bureau of Standards, No.

405, page 134 (1934 edition), and shall be

considered free from hydrogen sulphide