Northwest Pipeline Corporation G P

Fourth Revised Volume No. 1

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Effective Date: 05/08/2008, Docket: RP08-311-000, Status: Effective

First Revised Sheet No. 18-A First Revised Sheet No. 18-A : Effective

Superseding: Original Sheet No. 18-A

RATE SCHEDULE TF-1

Firm Transportation

(Continued)

3. MONTHLY RATE(S) (Continued)

price which was bid by a Replacement Shipper or a Prearranged

Replacement Shipper under the bidding procedures for capacity

releases set forth in Section 22 of the General Terms and

Conditions and the contract demand acquired by the Replacement

Shipper or the Prearranged Replacement Shipper.

(b) Shipper will pay the Reservation Charges commencing with the

primary term begin date set forth in the Service Agreement.

3.2 Volumetric Charge: The sum of (a) and (b) below:

(a) An amount obtained by multiplying (i) the quantity of Dth

scheduled for delivery by Transporter to Shipper after

transportation during the month, after reduction for fuel use

reimbursement furnished in kind in accordance with the terms of

the executed Service Agreement and Section 14 of the General Terms

and Conditions, by (ii) the TF-1 (Large Customer) or TF-1 (Small

Customer) Base Tariff Volumetric Transportation rate as set forth

on Sheet No. 5 of this Tariff. Unless specifically adjusted

pursuant to Section 3.5 herein, the Maximum Base Tariff Rate set

forth on Sheet No. 5 shall apply.

(b) An amount obtained by multiplying (i) the quantity of Dth

scheduled for delivery by Transporter to Shipper after

transportation during the month, after reduction for fuel use

reimbursement furnished in kind in accordance with the terms of

the executed Service Agreement and Section 14 of the General Terms

and Conditions, by (ii) the ACA component as set forth on Sheet

No. 5 of this Tariff. This charge shall be subject to adjustment

in accordance with Section 16 of the General Terms and Conditions.

3.3 Volumetric Release Charges: For Capacity Release service pursuant

to Section 22 of the General Terms and Conditions which is provided

under a volumetric bid rate the sum of (a), (b) and, if applicable, (c)

below:

(a) The amount obtained by multiplying (i) the quantity of Dth

scheduled for delivery by Transporter to Replacement Shipper or

Prearranged Replacement Shipper after transportation during the

month, after