Northwest Pipeline Corporation

First Revised Volume No. 1-A

Effective Date: 06/02/1991, Docket: RP91-150-001, Status: Effective

Substitute First Revised Sheet No. 417 Substitute First Revised Sheet No. 417 : Effective

Superseding: Original Sheet No. 417

GENERAL TRANSPORTATION TERMS AND CONDITIONS

(Continued)

12. PRIORITY OF SERVICE (Continued)

Transporter shall, without liability to any Buyer or Shipper, curtail or

interrupt deliveries in accordance with the priorities set forth below,

to the extent necessary to maintain superior priority of service.

(a) Transporter first shall interrupt all interruptible service which is

being provided at a rate less than the maximum rate applicable to

such service by rate being paid, from lowest to highest. Service

which is being provided at the same rate shall be interrupted by

Priority Date, from newest to oldest. Service which is being

provided at the same rate and which also has the same Priority Date

shall be interrupted on a pro-rata basis based on maximum daily

quantity. In order to avoid interruption based on rate, any Shipper

who receives interruptible transportation service at less than the

maximum rate, may agree in the executed Transportation Agreement to

pay a rate higher than the discounted rate, up to the maximum rate.

Such rate shall be specified in the executed Transportation

Agreement. The actual rate charged, up to the specified rate, shall

only be that rate necessary to avoid interruption and would only be

paid by Shipper as long as necessary to avoid interruption of service

by rate;

(b) Transporter then shall interrupt all interruptible service which is

being provided at the maximum rate applicable to such service by

Priority Date, from newest to oldest Agreements having the same

Priority Date shall be interrupted on a pro-rata basis based on

maximum daily quantity; and

curtail or interrupt all firm services on a pro rata basis in

proportion to the contract demands set forth in the executed service

agreements, provided, however that such interruption or curtailment

shall be subject to the limitations on protection of essential

agricultural uses and high priority users set forth in Section 13.5

of First Revised Volume No. 1 of Northwest's FERC Gas Tariff.

12.5 Operating Limitations. Notwithstanding the other provisions of this

Section 12, Transporter shall not be required to interrupt transportation

to any Shipper or curtail sales to any Buyer served from those locations

on Transporter's system where, due to operational or capacity limitations,

Transporter's ability to maintain the priorities provided herein would not

be improved. Transporter shall not be obligated to modify its system

operations or its operating procedures related to firm sales or firm

transportation in order to ameliorate specific operating and capacity

limitations which result in interruptible transportation curtailment.