Williams Natural Gas Company

Second Revised Volume No. 1

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Effective Date: 05/01/1997, Docket: RP97- 67-004, Status: Effective

First Revised Sheet No. 503 First Revised Sheet No. 503 : Superseded

Superseding: Original Sheet No. 503

EXHIBIT ___

ELECTRONIC DATA INTERCHANGE TRADING PARTNER AGREEMENT

DATE: ___________________________

TO BE EFFECTIVE: ___________________________ (DATE)

COVERING TRANSACTION SET IDENTIFIER: _____________

Document Specific Operating Information:

(This section covers only the originating Document and its Functional

Acknowledgment or identification and timing of substitute Response

Document.)

Natural Gas Descriptive Name: _____________________________________________

ANSI X12 Version/Release Number:___________________________________________

ROW ORIGINATING RECEIVING

NUMBER ITEMS PARTY PARTY

1 Company Name

2 EDI Communication Phone Number

3 Third Party Service Provider Name

4 Primary EDI Receipt

Computer/Designated Site URL

Backup EDI Receipt

Computer/Designated Site URL

5 ISA Qualifier

6 ISA ID Code

7 GS ID Code

8 997 Functional Acknowledgment

Document (FA) (Y/N) N/A

9 FA Return Time Frame N/A

10 Response Document (RSP)

Number/Name N/A

11 Functional Acknowledgment

of Response N/A

12 RSP Return Time Frame N/A

13 Acceptance Document (ACPT) N/A

14 Functional Acknowledgment

of Acceptance N/A

15 ACPT Return Time Frame N/A

16 Retransmit Time Frame

(Original Document) N/A

17 Send/Receive Common Point Codes

(DRN No.) - Yes/No

18 Send/Receive Common Business

Entity Codes (Duns No.) - Yes/No

19 Signature Code