U.S. DOT/PHMSA - Decision

Page 1u.s. Department of Transportation Pipeline and Hazardous Materials Safety Administration 1200 New Jersey Ave., SE Washington, DC 20590 'JUL 1 620lD Mr. David Chittick Director, Pipeline Engineering TransCanada Pipelines Limited 450 - 1st Street, S.W. Calgary, Alberta, Canada T2P 5Hl Docket No. PHMSA-2009-0056 Dear Mr. Chittick: On February 6, 2009, TransCanada Pipeline Limited operator of American Natural Resources Pipeline (TCPL-ANR) wrote to the Pipeline and Hazardous Materials Safety Administration (PHMSA) requesting a special permit to waive compliance from PHMSA's pipeline safety regulation in 49 CFR § 192.611 for one (1) segment of the TCPL-ANR natural gas transmission pipeline system located in Tate County, Mississippi. The regulation requires confirmation or revision of the maximum allowable operating pressure (MAOP) ofa pipeline segment where the class location has changed. PHMSA is denying this special permit due to insufficient information in the application demonstrating the adequacy of the pipe steel toughness properties to mitigate fracture propagation. The reasons for this denial are more fully described in the special permit analysis and findings document enclosed with this letter. This document and all other pertinent documents are available for review in Docket No. PHMSA-2009-0056 in the Federal Docket Management System (FDMS) located on the internet at www.Regulations.gov. TCPL-ANR should comply with the requirements of 49 CFR § 192.611 by September 30, 2011. My staff would be pleased to discuss this special permit or any other regulatory matter with you. John Gale, Director of Regulations (202-366-4046), may be contacted on regulatory matters and Alan Mayberry, Deputy Associate Administrator for Pipeline Safety (202-366-5124), may be contacted on technical matters specific to this special permit Sincerely, ~~ Jeffrey D. Wiese Associate Administrator for Pipeline Safety Enclosure: Special Permit Analysis and Findings#