Gas Transmission Northwest Corp.

Third Revised Volume No. 1-A

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Effective Date: 10/06/2003, Docket: RP04- 23-000, Status: Effective

Original Sheet No. 114 Original Sheet No. 114 : Effective

TRANSPORTATION GENERAL TERMS AND CONDITIONS

(Continued)

5. MEASUREMENTS

5.1 Metering: The gas shall be metered by one or more orifice,

turbine, ultrasonic, displacement or other-type meters, at

the discretion of GTN. All meters shall be installed

and maintained, and volumes shall be measured,in accordance

with applicable A.G.A. standards for the meter in question.

5.2 Specific Gravity: The specific gravity of the gas delivered

hereunder shall be determined from the read-outs of

continuously operating measuring instruments. The method

shall consist of one of the following:

(a) gravitometer

(b) gas chromatography

(c) other instruments acceptable to both parties

Analysis of chromatograph shall comply with the standards set

forth in ASTM D 1945. Calculation of the specific gravity from

compositional analysis by gas chromatography shall comply with

the standards set forth in ASTM D 3588. Measurement of the

specific gravity with a gravitometer shall comply with the

standards set forth in ASTM D 1070.

5.3 Flowing Temperature: Flowing gas temperature shall be

continuously measured and used in flow calculations.

(Continued)