# PHMSA Environmental Assessment/FONSI - **operation:** document - **citation:** 0900006480e91a54 - **title:** PHMSA Environmental Assessment/FONSI - **source type:** rulemaking - **agency:** Pipeline and Hazardous Materials Safety Administration - **status:** current - **official:** true - **published on:** Not available - **effective on:** Not available - **summary:** The document evaluates a special permit petition from TransCanada (TCPL-ANR) to remain at existing maximum allowable operating pressures on four segments of Line 716 in St. Martin Parish, Louisiana, after class locations changed from Class 1 to Class 3 due to increased nearby population. PHMSA considered granting the permit with conditions but concluded “even with conditions, the issuance of a special permit would be inconsistent with pipeline safety,” and therefore denied the request. PHMSA found known longitudinal seam and other pipe integrity issues on the affected segments that would not be acceptably mitigated by the proposed conditions, and determined that denial would likely lead to pipe replacement or pressure reduction/requalification, producing a net positive safety and environmental outcome. The analysis is limited to the information and materials in the PHMSA docket for PHMSA - **machine formats:** - **json:** https://regulus.evalyn.ai/document/regulations-gov-attachment-0900006480e91a54.json - **markdown:** https://regulus.evalyn.ai/document/regulations-gov-attachment-0900006480e91a54.md - **app url:** https://regulus.evalyn.ai/document/regulations-gov-attachment-0900006480e91a54 - **source url:** https://downloads.regulations.gov/PHMSA-2009-0055-0014/attachment_1.pdf **body:** <<>> PIPELINE AND HAZARDOUS MATERIALS SAFETY ADMINISTRATION SPECIAL PERMIT ENVIRONMENTAL ASSESSMENT and FINDING OF NO SIGNIFICANT IMPACT Special Permit Requester: TransCanada Pipelines Limited PHMSA Docket No.: PHMSA-2009-0055 Location of Subject Facilities: St. Martin Parish, Louisiana Document Date: May 19, 2010 Contacts: Tewabe Asebe, 202-366-5523, tewabe.asebe@dot.gov I. Background The National Environmental Policy Act (NEPA), 42 USC §§ 4321 – 4375, Council on Environmental Quality regulations, 40 CFR §§ 1500-1508, and DOT Order 5610.1C, require that PHMSA analyze a proposed action to determine whether the action will have a significant impact on the human environment. PHMSA analyzes special permit requests for potential risks to public safety and the environment that could result from our decision to grant or deny the request. As part of this analysis, PHMSA evaluates whether a special permit would impact the likelihood of a pipeline failure as compared to the environmental status quo in the absence of the special permit. We are denying TransCanada’s special permit request because based on our analysis it would not be consistent with pipeline safety. We developed this assessment to determine the effects of our action on the environment. II. Purpose and Need On February 6, 2009, Pipeline and Hazardous Materials Safety Administration (“PHMSA”) received a special permit petition from TransCanada Pipelines Limited, operator of American Natural Resources Pipeline (TCPL-ANR) for relief from the requirements of 49 C.F.R. § 192.611(a), concerning maximum allowable operating pressure (MAOP) limitations for certain pipeline segments located in St. Martin Parish, Louisiana.1 The class locations along these pipeline segments have changed from an original Class 1 location to a Class 3 location because of an increase in the population within the original class location of the pipeline. Section 192.611(a) would require TCPL-ANR to take one or more actions, including a reduction in operating pressure, the performance of pressure tests to re-qualify MAOP, or the installation of new pipe, to continue operating the affected segments after a class location change. TCPL-ANR 1 A description of the pipeline segments can be found in the docket for this Special Permit request (PHMSA-2009- 0055) at www.regulations.gov. - See PHMSA Special Permit Analysis and Findings, 2. <<>> would like to continue operating the affected segments at their current MAOPs, despite the fact that those segments have experienced changes in Class Location. PHMSA weighed the alternatives of granting the permit with conditions or denying the permit. PHMSA is denying TransCanda’s special permit request. PHMSA concluded that even with conditions, the issuance of a special permit would be inconsistent with pipeline safety. III. Affected Environment TCPL-ANR’s special permit request concerns four special permit segments along its natural gas transmission pipeline system. These four special permit segments are on the 20-inch Line 716 located in St. Martin Parish, Louisiana. 2 The class locations along these pipelines have changed from an original Class 1 location to a Class 3 location, due to an increase in the population near the pipeline segments. The population figures in the vicinity of the affected segments and other information about the affected environment are incorporated into this document and can be found in the docket PHMSA-2009-0055, at www.Regulations.gov. 3 IV. Alternatives Considered and Environmental Impacts of Each Alternative Alternative 1: Grant Special Permit Request with Conditions Under this alternative, we would grant the special permit with certain conditions designed to reduce the risks associated with permitting TCPL-ANR to continue to operate its pipeline segments at the existing MAOP in Class 3 locations. TCPL-ANR would be required to take action to reduce risks associated with pipe coating, cathodic protection, damage prevention, and weld seam and girth weld integrity. As PHMSA has done in past class location special permits, we would condition a special permit on TCPL-ANR performing close interval surveys to determine the effectiveness of its cathodic protection systems; performing a pipeline coating survey and repairing damage; performing stress corrosion cracking surveys; improving damage prevention programs; performing engineering analysis of longitudinal pipe seams and remediating any threats; performing pipeline inspections with instrumented in-line inspection (ILI) tools and repairing any anomalies, etc. Some of the conditions that would be imposed if the permit were granted would have a positive impact on the environment because they would provide enhanced safety protections for a number of pipeline threats. However, on balance, selection of this alternative could have a negative impact on the environment. This choice would not reduce pipeline safety threats associated with known longitudinal weld seam issues with some of the pipe used on TCPL-ANR pipeline segments, nor would it reduce threats associated with a lack of documentation on pipe 2 A Map and description of the environment surrounding the pipeline segments can also be found in the docket. See page 9 of each of TransCanada’s responses to PHMSA’s environmental questionnaire. 3 See TransCanada’s responses to PHMSA’s environmental questionnaire. 2 <<>> mechanical and chemical properties and girth welds on other pipe segments.4 PHMSA has specifically recognized the dangers of seam threats in its “Criteria for Considering Class Location Waiver Requests” (69 FR 38948) and through our experience with numerous longitudinal seam-related failures. These seam threats increase the possibility of a failure of the TCPL-ANR segments that would be subject to a special permit. The threats posed by these pipe seam characteristics are not acceptable in a populated Class 3 location. There is no existing technology to remediate these in service gas pipelines that would mitigate the safety risks in a Class 3 Location consistent with replacing the pipe with modern steel pipe, external coatings, field welding, girth weld non- destructive testing, and in-place hydrostatic testing methods. Gas pipeline failures are a threat to the public and the environment because they may result in fires or explosions, which can harm the public and the environment. Alternative 2: Deny Special Permit Request Under this alternative, we would deny TCPL-ANR’s special permit request. TCPL-ANR would not be granted a waiver of compliance with the requirements of § 192.611(a), and would be required to continue to comply with existing regulations. Current regulations have achieved excellent safety performance through use of increased safety factors, to compensate for unknowns or technological limitations associated with historical operation and maintenance practices, as the population near a natural gas transmission pipeline increases (resulting in Class Location changes). Because certain of TCPL-ANR’s pipeline segments are now in Class 3 locations due to an increase in population in the nearby area, the company would have to reduce the operating pressure of the Class 3 pipeline segments, perform pressure tests to re-qualify the pipe, or install new pipe. TCPL-ANR has indicated that if its special permit request is denied it would replace 0.47 miles of pipe in order to address the Class Location change. Denial of the special permit request (if TCPL-ANR, in fact, chooses not to reduce pressure or re- qualify pipe MAOP) could lead to the disturbance of soil, vehicle and equipment travel on the rights-of-way, and other negative environmental impacts associated with pipe replacement. However, such negative environmental impacts would be limited to the existing rights-of-way and would be the same impacts that would have likely occurred had TCPL-ANR never applied for a special permit and had simply complied with the regulations. PHMSA’s denial would have a positive impact on the environment because it would likely lead to TCPL-ANR replacing pipe with known longitudinal seam issues with new pipe, and a reduction in the risk of a pipeline failure in populated Class 3 areas. Gas pipeline failures can lead to fires and explosions and cause harm to the public and the environment. On balance, PHMSA’s denial of the permit would have a net positive impact because it is likely to lead to TCPL-ANR replacing the pipe with possible longitudinal weld seam and other safety threats. 4 A description of the issues associated with pipe weld seams, mechanical and chemical properties, and girth welds can be found in the docket. See PHMSA Special Permit Analysis and Findings, PHMSA-2009-0055. 3 <<>> V. Finding of No Significant Impact (FONSI) PHMSA has carefully analyzed the safety and environmental risks associated with denial of this special permit. By denying this special permit TCPL-ANR will be required to reduce the operating pressure or replace pipe that presents certain safety threats. The net safety and environmental impact of this denial will be positive. Therefore, we believe there are no significant environmental impacts associated with the denial of TCPL-ANR’s request. VI. List of Preparers and Reviewers Steve Nanney, PHMSA Jim Curry, PHMSA Tewabe Asebe, PHMSA VII. Agencies and Persons Consulted No other agencies were consulted, but PHMSA considered environmental information and documents submitted by TCPL-ANR. 4 - **truncated:** false - **body characters:** 9514