Northern Border Pipeline Company

First Revised Volume No. 1

Effective Date: 04/01/1997, Docket: RP97- 22-003, Status: Effective

First Revised Sheet Number 231 First Revised Sheet Number 231 : Effective

Superseding: Original Sheet Number 231

GENERAL TERMS AND CONDITIONS

4. MEASUREMENT REPORTING (Continued)

4.6 Atmospheric Pressure

For purposes of measurement, the absolute atmospheric

(barometric) pressure at each measuring station shall be

assumed to be the pressure corresponding to the elevation

at such station, and shall be stated in pounds per square

inch.

4.7 Measurement Responsibility

Subject to the provisions of Subsections 3.6 and 3.7

hereof, measurement of gas volumes and gross heating values

shall, for all purposes of this Tariff, be as recorded on

or computed from the measuring equipment and devices

Company shall cause to be furnished, installed, maintained,

and operated.

5. QUALITY OF GAS

5.1 Quality Standards of Gas Received by Company

Company may refuse to accept gas which does not conform to

the following specifications:

5.11 The gas shall not contain sand, dust, gums, crude

oil, impurities or other objectionable substances

which may be injurious to pipelines or may interfere

with the transmission of the gas.

5.12 The gas shall have a hydrocarbon dew-point less than

-5 degrees F at 800 psia, -10 degrees F at

1000 psia, or -18 degrees F at 1100 psia, or such

higher dew point approved by Company as, without

treatment by Company, may be compatible with the

operating conditions of Company's pipeline.