Decommission Oily Waste Water Lines- Canadian Forces Base (CFB) Halifax

The Department of National Defence (DND) has proposed a project which involves the decommissioning of the oily waste water pipe (OWWP) system located within tunnels and at various mechanical jetty mounts throughout the Halifax Dockyard. The system historically pumped compensating water from ships and submarines for treatment at the Oily Waste Water Treatment Plant, which was taken out of service in 2016 and has been deconstructed under the Cogswell District Redevelopment Project. The project will also involve removing associated infrastructure including holding tanks, recirculating pumps, any associated heat tracing, electrical connections/ conduit, and mechanical components unique to the system. Due to the complex arrangement of the pipe network through the tunnels, it is unlikely that the entire OWWP system can be accessed for removal without extensive excavation or reconfiguring of other tunnel services, therefore, focus will be on removing accessible portions of the OWWP beginning at the hook up point at each mechanical jetty mount. This will involve removing the pipe connection, sealing the hole in the jetty mount to prevent potential hook ups and environmental releases from a nonfunctioning system and removing accessible OWWP lines within the steam tunnels and dug trenches. OWWP that must remain because of inaccessibility will be capped and abandoned in place underground with a capping point accessible from the tunnels. This project will not involve any excavation or destruction of existing infrastructure in order to remove OWWP. OWWP abandoned in place will be recorded and addressed during future projects that will unearth this piping in the future as they occur. The proposed decommissioning project is scheduled to begin in Fiscal Year 2023-2024.

Latest update

June 6, 2023— The Department of National Defence issued its Notice of Determination and determined that the project is not likely to cause significant adverse environmental effects.



Key documents

Key documents
Document Number Document Title File Date
2 Notice of Determination - June 6, 2023
1 Public Comment Period on Intent to Make a Determination - March 31, 2023


Ryanne Hamblin
Department of National Defence
Ryanne Hamblin, Project Manager
PO Box 99000 Stn Forces
Halifax, Nova Scotia B3K 5X5

  • Location

    • HMC Dockyard, Canadian Forces Base Halifax (Nova Scotia)
  • Nature of Activity

    • Waste Management
  • Assessment Status

  • Start Date

  • Proponent

    Department of National Defence
  • Authorities

    • Department of National Defence
  • Assessment Type

    Project on federal lands
  • Reference Number


This map is for illustrative purposes. The markers represent the approximate locations based on available data. More than one marker may be identified for a given assessment.


Nearby assessments

...within 200 kilometres
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