Gas Transmission Northwest Corp.

Third Revised Volume No. 1-A

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Effective Date: 10/06/2003, Docket: RP04- 23-000, Status: Effective

Original Sheet No. 315 Original Sheet No. 315 : Effective

FORM OF SERVICE AGREEMENT

APPLICABLE TO ELECTRONIC DATA INTERFACE

EXHIBIT XXX (Sequential Number)

ELECTRONIC DATA INTERCHANGE TRADING PARTNER AGREEMENT

DATED ___________________

TO BE EFFECTIVE ___________________ (DATE)

COVERING TRANSACTION SET NUMBER ____________

DOCUMENT SPECIFIC OPERATING INFORMATION:

(This section covers only the originating Document and its

Functional Acknowledgement or identification and timing of

substitute Response Document.)

NATURAL GAS DESCRIPTIVE NAME:

___________________________________________

ASCX12 VERSION/RELEASE NO.:

___________________________________________

VAN ACCOUNT ID (as applicable):

___________________________________________

ROW ITEMS ORIGINATING RECEIVING

NO. PARTY PARTY

1 COMPANY NAME

2 EDI COMMUNICATION

PHONE NUMBER

3 THIRD PARTY SERVICE

PROVIDER NAME

4 RECEIPT COMPUTER/

PHONE NUMBER

5 ISA QUALIFIER

6 ISA ID CODE

7 GS ID CODE

8 FUNCTIONAL 997 DOCUMENT N/A

ACKNOWLEDGMENT (FA) (Y/N)

(Continued)