Northern Border Pipeline Company

First Revised Volume No. 1

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Effective Date: 07/01/2002, Docket: RP02-321-000, Status: Effective

Fifth Revised Sheet No. 211 Fifth Revised Sheet No. 211 : Effective

Superseding: Fourth Revised Sheet No. 211

GENERAL TERMS AND CONDITIONS

1. DEFINITIONS (Continued)

o The term "Gas Day" shall mean a period beginning and ending

at 9:00 a.m., Central Clock Time. The reference date for any

day shall be the date of the beginning of such day.

o The term "General Terms and Conditions" shall mean, at any

time, these General Terms and Conditions as from time to time

amended or supplemented.

o The term "gross heating value", shall mean gross heating

value dry as determined by the total calorific (heating)

value, in British thermal units, Btu, of the amount of any

dry gas which would occupy a volume of one standard cubic

foot, based on 14.73 Psia and 60 degrees F. The total, or

gross, calorific value represents the Btus evolved by the

complete combustion, at constant pressure, of one standard

cubic foot of any dry gas with air, the temperature of the

gas, air, and products of combustion being 60 degrees F, and

all water formed by the combustion reaction being condensed

to the liquid state.