Canadian Nuclear Laboratories Material Pit Expansion Project

In support of ongoing operations at the Canadian Nuclear Laboratories (CNL), the Chalk River Laboratories (CRL) site maintains a spoils and material processing pit that houses fill and material extracted from within the site. The pit is currently at capacity and therefore it is necessary to expand the area of this pit to ensure its safe operation and allow for effective sorting of materials for re-use on the CRL site. The proposed expansion takes advantage of a natural clearing and is approximately 2.3 hectares in area.  Project activities will include vegetation clearing and the installation of an 1170 m permanent fence around the perimeter of the pit.  A species at risk assessment was conducted and it was determined that the proposed site was unsuitable habitat for bat maternity roosts and other species at risk in the area.  All physical activities will be conducted in accordance with CNL's Environmental Policy and applicable legislation.

Latest update

Notice of Determination February 16 2021. Canadian Nuclear Laboratories, on behalf of Atomic Energy of Canada (AECL) has determined that the proposed Material Pit Expansion Project at AECL’s Chalk River site is not likely to cause significant adverse environmental effects. Potential environmental effects will be managed through technically and economically feasible mitigation measures and implemented for the following: air, water, and soil. More specifically, wetlands and streams will be protected, all vegetation clearing will be conducted outside of the breeding season and turtle fences will be installed and maintained around the perimeter of the work site. Therefore, Canadian Nuclear Laboratories, on behalf of Atomic Energy of Canada may carry out the project, exercise any power, perform any duty or function, or provide financial assistance to enable the project to be carried out in whole or in part.



Canadian Nuclear Laboratories
Patrick Quinn, Director, Corporate Communications
286 Plant Rd,
Chalk River, Ontario K0J 1J0
Telephone: 1-800-364-6989

  • Location

    • Chalk River Nuclear Laboratories Ltd., Chalk River, Ontario (Ontario)
  • Nature of Activity

    • Building and Property Development
    • Waste Management
    • Maintenance activities (fences, walls)
  • Assessment Status

  • Start Date

  • Proponent

    Atomic Energy of Canada Limited
  • Authorities

    • Atomic Energy of Canada Limited
  • 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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