As part of the Trans Mountain Expansion Project (TMEP), Trans Mountain is reactivating segments of the original 24-inch Trans Mountain Pipeline through Jasper National Park (JNP) and Mount Robson Provincial Park (MRPP), and a segment between Darfield Pump Station and the Black Pines Pump Station.


Reactivation work includes maintenance activities that are authorized under the approval certificate for the existing Trans Mountain pipeline. An Environmental Protection Plan (EPP) for these maintenance activities has been in place since 2017 and this work began in January 2020. The reactivation of these segments of pipeline will also involve construction activities that are regulated under CPCN OC-065 for the Trans Mountain Expansion Project. These include:

  • installation of additional mainline check valves and automated block valves
  • inspection and replacement of mainline block valves

Project Interaction

The Reactivation Environmental Protection Plan (Reactivation EPP) has been updated to include mitigation measures and procedures that will be implemented, during construction activities, such as valve modification work, as well as those that are in place during maintenance activities, to protect the environment and have as little impact as possible.

Specifically, the Reactivation EPP:

  • Identifies mitigation measures to be implemented during reactivation;
  • Provides instructions for carrying out reactivation activities in a manner that will avoid or reduce adverse environmental and socio-economic effects; and
  • Serves as reference information for the environmental and construction inspection personnel to support decision-making and provides direction to more detailed information (i.e., management and contingency plans).

Reactivation activities will occur during both non-frozen and frozen ground conditions (e.g. summer and winter seasons). The various reactivation activities have been scheduled for completion during the optimal season, based on terrain, soil and meteorological conditions and other considerations.

Cleanup and reclamation will commence after construction activities are completed as weather conditions permit and in consideration of seasons and environmental timing windows.

Planned Mitigation

General mitigation measures include:

  • adhering to all applicable Federal, Provincial and Municipal guidelines and legislation regarding noise management, where feasible;
  • staking and flagging environmental features (e.g. rare plants, wildlife species at risk, Traditional Land Use sites and archaeological features etc) to avoid or reduce effects of construction;
  • using signs and access barriers where appropriate to deter unauthorized access;
  • mitigation for water crossings and work in and around wetlands; and
  • implementing minimum disturbance construction techniques, where feasible, to reduce disturbance to riparian areas.

Inside JNP and MRPP, additional mitigations are required. Parks-specific mitigation measures include:

  • complying with all National Park regulations for work conducted within JNP;
  • confining work to existing approved pipeline easements and associated temporary workspace;
  • scheduling work that may cause sensory disturbance between 8am and 8pm and not on any long-weekend within 1 km of warden stations, residential and commercial accommodation and campgrounds and the Jasper town site, unless otherwise approved by the Appropriate Government Authority;
  • mitigation for protection of wildlife;
  • obtaining any necessary permits for helicopter use within JNP and adhere to Conditions specified;
  • maintaining an above ground elevation of at least 300 m, if helicopter use is necessary, to avoid active sheep lambing areas and active elk calving areas; and
  • mitigation for working in wet/thawed soil conditions

CER Condition 72

The Reactivation EPP was prepared to address the requirements outlined in CER Condition 72. In the two reactivation segments, this condition only applies to construction and refurbishment of the valves.

Also included in this EPP are measures that apply to the maintenance activities required for reactivation of the pipe.

Read the full Reactivation EPP on the CER website here.

Please provide any feedback on the mitigation measures proposed during construction and refurbishment of valves to [email protected]