Trunkline Gas Company, LLC

Third Revised Volume No. 1

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Effective Date: 08/01/2003, Docket: RP03-534-000, Status: Effective

Original Sheet No. 532 Original Sheet No. 532 : Effective

OPERATIONAL BALANCING AGREEMENT (Continued)

FORM OF SERVICE AGREEMENT

TRUNKLINE

Pipeline Emergencies: Trunkline Gas Company, LLC

(Not to be used for Attn: Gas Control

any other purpose) P. O. Box 4967

Houston, Texas 77210-4967

Phone: (713) 627-5621

Toll Free: 1-800-225-3913

Texas only: 1-800-221-1084

All Other: Trunkline Gas Company, LLC

Attn: Customer Services

P. O. Box 4967

Houston, Texas 77210-4967

Phone: (713) 627-4272 or

1-800-275-7375

Fax: (713) 989-1178

OBA Party

Billing:

Nomination and

Scheduling: (1)

All Other:

(1) Please provide street address in addition to mailing address.