Northwest Pipeline Corporation G P

Fourth Revised Volume No. 1

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

First Revised Sheet No. 209 First Revised Sheet No. 209

Superseding: Original Sheet No. 209

GENERAL TERMS AND CONDITIONS

(Continued)

4. MEASUREMENT OF GAS (Continued)

(c) by estimating the quantity of deliveries by comparison with

deliveries during preceding periods under similar conditions when

the meter was registering accurately.

4.9 Correction of Volume Calculation Error. If, upon inspection and

verification, any volume calculation error shall result in a daily

volume inaccuracy exceeding two (2) percent, then the inaccuracy shall

be corrected to zero error following verification by Transporter and

Shipper, however, in no event shall inaccuracies less than two (2)

percent daily or 100 Dth monthly be corrected.

4.10 Prior Period Adjustments. NAESB WGQ Flowing Gas Related Standards

2.3.11 and 2.3.12 (Version 1.8) will apply and are incorporated by

reference.

4.11 Records Preservation. Each party shall preserve all test and

measurement data, charts or similar records for a period of at least one

(1) year or such other periods as shall be required under Part 225 of

the Commission's regulations or the lawful requirements of any other

governmental body, Federal or State, prescribing longer retention

periods for any category of record.