Williston Basin Interstate Pipeline Co.

Second Revised Volume No. 1

Effective Date: 08/23/2004, Docket: RP04-410-000, Status: Effective

Second Revised Sheet No. 121 Second Revised Sheet No. 121 : Effective

Superseding: First Revised Sheet No. 121

RATE SCHEDULE IS-1

INTERRUPTIBLE STORAGE SERVICE (Continued)

2. APPLICABILITY AND CHARACTER OF SERVICE (Continued)

2.2 Storage service hereunder shall consist of the acceptance by

Transporter of gas for injection into storage, the retention of such gas

in storage, and the withdrawal of such gas from storage for

transportation, all in accordance with the provisions set forth in the

Service Agreement.

2.3 The maximum quantity of gas to be stored, and the maximum daily

injection and withdrawal quantities of gas shall be set forth in the

Service Agreement hereunder.

2.4 Shipper may sell, assign or otherwise transfer all or any portion

of its gas held in storage hereunder to another Shipper having an

executed Storage Service Agreement with Transporter upon twenty-four

(24) hours notice to Transporter without the incurrence of withdrawal or

injection fees solely as a result of the sale, assignment or transfer.

If such sale, assignment or transfer shall occur, the original Shipper

is responsible for the charges applicable to the transportation of such

gas to storage for injection as if no stop-in-time had been applied to

such transportation and for applicable storage charges up to the date of

transfer and such acquiring Shipper is responsible for paying all

storage charges applicable to such gas under its Storage Service

Agreement on and after the date of transfer and for separately paying

the charges for the transportation of such gas after withdrawal as if no

stop-in-time had been applied to such transportation. In the event the

original Shipper having an executed Interruptible Storage Service

Agreement under Rate Schedule IS-1 sells, assigns, or otherwise

transfers gas held in storage to such acquiring Shipper having an

executed Firm Storage Service Agreement under Rate Schedule FS-1, the

original Shipper shall be billed by Transporter on the date of transfer

the difference in the withdrawal rate between Rate Schedules IS-1 and

FS-1 as set forth on Sheet Nos. 19 and 20 of Transporter's Tariff.

2.5 Transporter reserves the right to order the withdrawal of all or

any portion of Shipper's storage gas at any time. If, in Transporter's

reasonable discretion, such withdrawal is necessary, Transporter shall

give Shipper at least ten days notice of the need to commence

withdrawals, specifying the intended withdrawal schedule. Transporter

and Shipper shall consult in order to insure that all relevant factors

are considered in implementing such withdrawals. When withdrawals are

ordered, they shall be applied on a pro rata basis to all Shippers

hereunder to the extent that operating or other relevant conditions

permit or require.