Williston Basin Interstate Pipeline Co.

Second Revised Volume No. 1

Effective Date: 09/01/2003, Docket: RP03-286-000, Status: Suspended

Fourth Revised Sheet No. 658 Fourth Revised Sheet No. 658 : Suspended

Superseding: Substitute Third Revised Sheet No. 658

FORM OF SERVICE AGREEMENT

APPLICABLE TO RATE SCHEDULE IS-1 (Continued)

EXHIBIT "A"

Rate Schedule IS-1 Interruptible Storage Service Agreement

dated _________________between

WILLISTON BASIN INTERSTATE PIPELINE COMPANY (Transporter) and

________________________ (Shipper)

Effective date of Exhibit "A"_____________________________________

Supersedes Exhibit "A" dated _____________________________________

Injection Quantity: __________________ dkt/d

Withdrawal Quantity: __________________ dkt/d

Capacity Quantity: __________________ equivalent dkt

Party on whose behalf transportation service is being provided

pursuant to Section 311 of the NGPA is _____________________.

Interruptible Rate Rate

Storage Service Storage Effective Effective

Components Rate (per dkt) Begin Date End Date

--------------------- -------------- ---------- ---------

Capacity Charge 1/ 2/ 2/

Injection Charge 1/ 2/ 2/

Withdrawal Charge 1/ 2/ 2/

1/ Unless discounted by Transporter pursuant to Section 3.3 of Rate

Schedule IS-1, the applicable rate for service hereunder is the

effective maximum rate for Rate Schedule IS-1 service on file with the

FERC, as same may change from time to time. Should Transporter and

Shipper negotiate a specific discount rate, such downward price

adjustment shall be for a specific term and shall apply only if one or

more of the following instances occur: (1) specified volumes under such

Service Agreement are achieved; (2) during specified periods of the year

or for a specifically defined period; and/or (3) to specified

receipt/delivery points, subsystem(s) and/or other defined geographical

area(s). A discount agreement which provides for an agreed discount as

to a specified volume will not be invalidated if the Shipper transports

an incremental volume above that specified volume. Such incremental

volume will be priced at a mutually agreeable price between Transporter

and Shipper.

2/ Unless otherwise noted, rates will be in effect for the term of the

contract.