Centra Pipelines Minnesota Inc.

Second Revised Volume No. 2

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Effective Date: 10/16/1991, Docket: RP91-136-002, Status: Effective

Original Sheet No. 21 Original Sheet No. 21 : Effective

of the gas being delivered, or, if not installed, by sampling

the gas at intervals of not more than one (1) month.

(e) The supercompressibility factor used in computing the

volume of gas delivered through a meter shall be

determined in a manner consistent with the method

presented in the American Gas Association "Manual for the

Determination of Supercompressibility Factors for Natural

Gas" (N-X 19 Report) or American Gas Association Report

No. 8 "Compressibility and Supercompressibility for Natural

Gas and Other Hydrocarbon Gases."

(f) The average absolute atmospheric (barometric) pressure at

each metering location shall be that determined in

accordance with accepted methods irrespective of variations

in actual barometric pressure from time to time.

SECTION 9 - MEASURING EQUIPMENT

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9.1 Centra presently owns, maintains and operates at its own expense,

measuring stations properly equipped with meters and other

necessary measuring equipment by which the volume of gas to be

received and delivered shall be measured.