Thunderchild First Nation Lagoon Upgrade

The Proposed Project

- Construction of a facultative wastewater lagoon expansion on Thunderchild IR115B, including a 6.75 ha primary cell, a 119,025 cu.m. storage cell, compacted clay liner, related structures, piping, and modifications to the two existing lagoon cells (20-year design);
- Installation of approx. 420 lin.m. of 150 mm of sewage main and 1,900 lin.m. of 200 mm dia. HDPE effluent drain line;
- Effluent drain control structure near Turtle River;
- Miscellaneous infrastructure upgrades, manholes and site fencing;
- Access road upgrades and new road construction;
- Provision of roads for ingress and egress to the location of all work required;
- Clean up of site; and
- Repair of defects for one year after completion of the work

Aquatic Habitat Protection Permit - SK Water Security Agency - outfall control structure at Turtle River;
Request for Review - Fisheries and Oceans Canada - outfall control structure at Turtle River.

Lagoon and access road are within SE-15-52-20-W3M and NE-10-52-20-W3M.
Effluent drain line runs through NE-10-52-20-W3M, SE-10-52-20-W3M, SW-11-52-20-W3M and NW-02-52-20-W3M.

Pre-planning - feasibility study, preliminary design report, geotechnical investigation, downstream use and impact study completed to define scope and risks; detailed design to identify construction procedures and environmental protection measures.
Site preparation - topsoil stripping and vegetation removal from construction areas.
Construction - earthwork to build lagoon cell berms and floors, installation of influent, transfer and outfall structures, installation of effluent drain line, tie-ins to existing infrastructure, importing suitable clay material for liner material (600 mm thick on floor and 1,200 mm thick on side slopes of cells).
Operation - very low operating requirements - annual or bi-annual treated effluent release to Turtle River.
Decommissioning - modifications to existing lagoon cells are required to incorporate into new design; brief decommissioning followed by re-commissioning with new features.

Minimal construction waste - some formwork from concrete structure (likely re-useable), chain link fence waste pieces and HDPE pipe shavings / waste pieces.


Latest update

January 18, 2022 - Indigenous Services Canada issued its notice of determination Notice of Determination for Thunderchild First Nation Lagoon Upgrade ( and determined that the project is not likely to cause significant adverse environmental effects.


Key documents

Key documents
Document Number Document Title File Date
5 Notice of Determination for Thunderchild First Nation Lagoon Upgrade - January 18, 2023
4 Geotechnical Investigation PDF (4.7 MB) August 24, 2022
3 Pre-design report PDF (6.6 MB) August 24, 2022
2 Downstream Use and Impact Study PDF (7.7 MB) August 24, 2022
1 Public Comment Period on Intent to Make a Determination - August 24, 2022


Indigenous Services Canada
Alvin Hamilton Building, 1783 Hamilton Street
Regina, Saskatchewan S4P 2B6
Telephone: 306-581-3134

  • Location

    • Thunderchild IR115B (Saskatchewan)
  • Nature of Activity

    • Waste Management
  • Assessment Status

  • Start Date

  • Proponent

    Thunderchild First Nation
  • Authorities

    • Indigenous Services Canada
  • 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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