Northwest Pipeline Corporation G P

Fourth Revised Volume No. 1

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Effective Date: 11/01/2009, Docket: RP09-1056-000, Status: Effective

First Revised Sheet No. 222 First Revised Sheet No. 222

Superseding: Original Sheet No. 222

GENERAL TERMS AND CONDITIONS

(Continued)

12. SCHEDULING PRIORITIES AND CURTAILMENT POLICY (Continued)

After scheduling interruptible storage capacity, Nominations for

injections/withdrawals for interruptible service under Rate

Schedules SGS-2I, SGS-2F (best-efforts), DEX-1 (Deferred Exchange

Quantities that exceed the Daily Delivery Quantity), and PAL will

be scheduled. If all such injection and/or withdrawal Nominations

cannot be accommodated, available capacity will be allocated pro

rata based on otherwise acceptable and confirmable Nominations.

For services with Negotiated Rates, the rates used for scheduling

priorities are delineated in Section 12.5.

12.3 Scheduling Priorities for Clay Basin Storage

If Transporter determines that its operationally available injection,

withdrawal, and storage capacities at the Clay Basin storage facility

are insufficient to accommodate all otherwise acceptable new Nominations

related to system balancing and/or, for services under Rate Schedules

DEX-1 and PAL in any Nomination cycle, Transporter will schedule the

operationally available capacity for Nominations that have not already

been scheduled for a given Gas Day in accordance with the following

priorities of service:

(a) First, Nominations for Transporter's system-balancing

requirements will be scheduled.

(b) Second, Nominations for deliveries of Deferred Exchange

Quantity under Rate Schedule DEX-1, up to the Daily Delivery

Quantity, will be scheduled. If all such Nominations cannot be

accommodated, available capacity will be allocated based on rate,

highest to lowest. For services at the same rates, any necessary

allocations of available capacity will be pro rata based on

otherwise acceptable and confirmable Nominations.

(c) Third, Nominations (including Shipper's requests for in-

ground storage transfers) for interruptible storage capacity under

Rate Schedule PAL will be scheduled. If all such storage