Northwest Pipeline Corporation G P

Fourth Revised Volume No. 1

Effective Date: 02/20/2009, Docket: RP09-227-000, Status: Effective

First Revised Sheet No. 52B First Revised Sheet No. 52B

Superseding: Original Sheet No. 52B

RATE SCHEDULE SGS-2F

Storage Gas Service - Firm (Continued)

7. STORAGE CAPACITY

Shipper's Storage Capacity shall be the maximum quantity of gas in Dth

which Transporter is obligated to store for Shipper's account and shall be

specified in the executed Service Agreement between Transporter and Shipper.

Transporter's service obligation is limited to Shipper's Storage Capacity, as

adjusted for any released capacity pursuant to Section 22 of the General Terms

and Conditions.

8. DEFINITIONS

8.1 A Storage Cycle is the twelve-month period beginning October 1 of

any calendar year and ending September 30 of the following calendar

year.

8.2 Shipper's Working Gas Inventory shall be the actual quantity of

working gas in storage for Shipper's account at the beginning of any

given day.

8.3 Shipper's Working Gas Quantity for a Storage Cycle shall be

determined as of October 1 and shall be the lesser of:

(a) Shipper's Working Gas Inventory as of October 1, the

beginning of the Storage Cycle; or

(b) The minimum quantity of Shipper's Working Gas Inventory at

any time between August 31 and September 30 of the preceding

Storage Cycle divided by 0.80; or

any time between June 30 and September 30 of the preceding Storage

Cycle divided by 0.35.