Northwest Pipeline Corporation G P

Fourth Revised Volume No. 1

Effective Date: 08/01/2009, Docket: RP09-607-000, Status: Effective

First Revised Sheet No. 208 First Revised Sheet No. 208

Superseding: Original Sheet No. 208

GENERAL TERMS AND CONDITIONS

(Continued)

4. MEASUREMENT OF GAS (Continued)

exercise care in the installation, maintenance and operation of check

measuring, pressure regulating equipment or gas compressors so as to

prevent any inaccuracy in the determination of the quantity or quality of

gas being measured. If unacceptable square root error or gauge line

error shifts occur, the installation of pulsation filters may be required

by Northwest. The party responsible for the source of any pulsation

shall also be responsible for the installation cost of remedial devices

or filtering equipment to reduce or eliminate such pulsation. If

disagreements over pulsation arise, a third-party consultant acceptable

to both Transporter and Shipper will be consulted to resolve the problem.

4.8 Adjustment of Inaccuracies. NAESB WGQ Flowing Gas Related Standards

2.3.13 and 2.3.14 (Version 1.8) will apply and are incorporated by

reference.

If the percentage of inaccuracy upon any test shall be an amount

exceeding two percent (2%), the registration of such meter shall be

corrected at the rate of such inaccuracy for any period which is

definitely known or agreed upon. In the event the period is not

definitely known or agreed upon, such correction shall be for a period

extending back one-half (1/2) of the time elapsed since the date of the

last calibration. In no event shall inaccuracies of less than two (2)

percent daily or 100 Dth monthly be corrected.

Following any test, measurement equipment found inaccurate shall be

immediately restored by the operating party as closely as possible to a

condition of accuracy. If the measurement equipment is out of service or

out of repair for any reason so that the amount of gas delivered cannot

be estimated or computed from the reading thereof, the amount of gas

delivered through the period such meter is out of service or out of

repair shall be estimated and agreed upon by the Transporter and

Receiving Party upon the basis of the best data available using the first

of the following methods which is feasible:

(a) by using the registration of the other party's check meter

if installed and accurately registering; or

(b) by correcting the error if the percentage of error is

ascertainable by calibration, test or mathematical calculation; or