Transcolorado Gas Transmission Company LLC

Second Revised Volume No. 1

Effective Date: 12/28/2007, Docket: RP08-167-000, Status: Effective

Original Sheet No. 411 Original Sheet No. 411 : Effective

TRADING PARTNER AGREEMENT

for the Electronic Data Interchange

of Information Over the Public Internet

Section 1. Prerequisites. (Continued)

1.4. Security Procedures. Each party, in its sole discretion and

expense, shall use and provide for the requisite levels of security which are

reasonably sufficient to ensure that all transmissions of Documents are

authorized by the parties and to protect their business records and data from

improper access. At a minimum, the parties shall provide and use those

security measures specified herein, in the NAESB standards as adopted by the

FERC, or as may be agreed upon by the parties as set forth in the Appendix.

1.5. Keys. When the parties are utilizing the Internet electronic

delivery mechanism as herein contemplated, each party shall maintain a Pretty

Good Privacy ("PGP") "public key," (an encryption algorithm used to facilitate

private electronic communication) which may be changed from time to time in

accordance with this Agreement or as may be set forth in the Appendix. Each

party shall provide to the other party its PGP public key by either (a) a

certified or receipted mail service using a diskette with the public key

contained in an ASCII text file, or (b) an electronic simple mail transfer

protocol (smtp) mail message with the public key contained in the body. Under

either option above, the public key shall be verified by the party to whom it

is sent by validating the fingerprint of the public key which may be

accomplished via telephone, fax, or other comparably reliable means. If a

party desires to change its public key, it shall provide at least five

business days prior notice thereof to the other party; provided that under an

emergency situation, a prior written notice of at least 24 hours shall be

given.

1.6. Electronic Signatures. Each party shall adopt as its signature

the PGP private key, where required by the Standards or otherwise agreed to by

the parties, in the Document transmitted by such party ("Signature Code(s)").

Such Signature Codes(s) shall be specified in the Appendix. Each party agrees

that the Signature Code(s) of such party affixed to or contained in any

transmitted Document shall be sufficient to verify that such party originated

the Document. Neither party shall disclose to any unauthorized person the

Signature Code(s) of the other party.