Northwest Pipeline Corporation G P

Fourth Revised Volume No. 1

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

First Revised Sheet No. 19A First Revised Sheet No. 19A

Superseding: Original Sheet No. 19A

RATE SCHEDULE TF-1

Firm Transportation

(Continued)

3. MONTHLY RATE(S) (Continued)

3.5 Discounted Recourse Rates:

(a) Transporter reserves the right to discount at any time the

Recourse Rates for any individual Shipper under any service

agreement without discounting any other Recourse Rates for that or

another Shipper; provided, however, that such discounted Recourse

Rates will not be less than the Minimum Currently Effective Rates

set forth on Sheet No. 5 of this Tariff, or any superseding

tariff. Such discounted Recourse Rates may apply to specific

volumes of gas (such as volumes above or below a certain level or

all volumes if volumes exceed a certain level), volumes of gas

transported during specific time periods, and volumes of gas

transported from specific receipt points and/or to specific

delivery points, within specific corridors, or within other

defined geographical areas. If Transporter discounts any Recourse

Rates to any Shipper, Transporter will file with the Commission

any required reports reflecting such discounts.