Northwest Pipeline Corporation

First Revised Volume No. 1-A

Effective Date: 11/25/1990, Docket: GT91- 5-000, Status: Effective

Original Sheet No. 407 Original Sheet No. 407 : Effective

GENERAL TRANSPORTATION TERMS AND CONDITIONS

(Continued)

4. MEASUREMENT OF GAS (Continued)

4.3 Meters or Measurement Equipment. For purposes of this section,

Meters or Measurement Equipment shall mean the primary measurement

element (i.e., orifice plate, turbine meter, etc.), and recording

instruments. Gas delivered to Transporter at the Receipt Points shall be

measured by measurement equipment installed, operated and maintained at

such Receipt Points by the party(ies) identified on Exhibit "A" to the

Transportation Agreement. Gas delivered by Transporter at the Delivery

Points shall be measured by measurement equipment installed, operated and

maintained at such Delivery Points by the party(ies) identified on

Exhibit "B" to the Transportation Agreement. Where orifice meters are

used they shall be installed and operated in accordance with the

specifications prescribed in ANSI/API 2530 as supplemented and modified

from time to time, applied in a practical and appropriate manner. Where

positive displacement meters, turbine meters, or other measuring devices

are used, they shall be installed and operated in accordance with

recommendations of the American Gas Association, where available. The

respective meter, meter readings and meter charts shall be accessible at

all reasonable times to inspection and examination by the non-operating

party. Calibration and adjustment of meters and changing of charts shall

be done only by the party owning and operating the measurement

facilities, unless otherwise agreed to by the parties.

4.4 Temperature and Specific Gravity. The following measurement

factors shall be given due consideration.

(a) The temperature of the natural gas flowing through each meter

shall be an assumed temperature arrived at by agreement or the

actual measured temperature.

(b) The specific gravity of the gas shall be determined by the

party operating the meter by calculation, adjusted for any

difference between the specific gravity in the ideal state and in

the real state in accordance with published procedures accepted by

the American Gas Association.

4.5 Notice of Equipment Tests. Unless otherwise agreed to by the

parties, the party operating the measurement facilities shall give notice

to the other party of the time and location of all tests of gas delivered

hereunder or of any equipment used in measuring or determining the nature

or quality of such gas, in order that such other party may conveniently

have its representative present. Should the non-operating party