Northwest Pipeline Corporation G P

Fourth Revised Volume No. 1

Effective Date: 01/31/2008, Docket: RP08-130-000, Status: Effective

Original Sheet No. 236 Original Sheet No. 236 : Effective

GENERAL TERMS AND CONDITIONS

(Continued)

15. DETERMINATION OF DELIVERIES AND IMBALANCES (Continued)

In the event an undertake situation exists, Transporter shall

notify each Receiving Party of the volume required to be taken off the

system within the next 72 hours as imbalance make-up to eliminate the

underrun imbalances so as to return the system to a reasonable

operational level and avoid the imbalance penalty as specified in

Section 15.5(c)(v). Such volumes shall be based upon cumulative

underrun imbalances which contributed to the underrun imbalance problem

as determined by Transporter's operational data up to the date of the

Declared Entitlement Period and calculated for each Receiving Party in

proportion to such party's undertakes. Daily unauthorized underrun

charges as specified in Sections 15.5(c)(iii) and (iv) will also apply

if Receiving Party causes additional unauthorized underrun imbalances

during a Declared Entitlement Period.

Receiving Party shall pay Transporter for all unauthorized overrun

or underrun volumes, as defined in Section 15.5(a) above, that meet or

exceed the percentage specified by Transporter in its Declared

Entitlement. Such percentage will be (i) in Transporter's sole

discretion 3%, or, in the case of a Declared Entitlement announced on

the day it is to be in effect, 5% for that day (Stage I), 8% (Stage II)

or 13% (Stage III) of Receiving Party's entitlement as set forth in

Section 15.5(b) with respect to unauthorized overrun volumes

(individually, the "Threshold Percentage"), and (ii) 5% of Receiving

Party's entitlement as set forth in Section 15.5(b) with respect to

underrun volumes. The following amounts will be payable in addition to

the amounts otherwise payable by Receiving Party to Transporter under

Transporter's applicable Rate Schedules, subject only to the provisions

set forth in (d) below:

(i) For that part of the unauthorized overrun volume which is at

least the Threshold Percentage of Receiving Party's entitlement

for such day, but less than the Threshold Percentage plus 2% of

Receiving Party's entitlement for such day, an amount per Dth as

set forth on Sheet No. 5 of this tariff.

(ii) For that part of the unauthorized overrun volume which is at

least the Threshold Percentage plus 2% of Receiving Party's

entitlement for such day, an amount per Dth as set forth on Sheet

No. 5 of this tariff.