Soil Remediation at Slate Island Coast Guard Site, Patterson Island, Ontario

The Slate Island Coast Guard site is situated on Sunday Point of Patterson Island, Lake Superior, Ontario, the largest and most southerly portion of the Slate Islands group. It is located approximately 18 kilometres (km) south of Terrace Bay, Ontario, and 165 km east of Thunder Bay, Ontario. The Site was operated as a manned lightstation between 1903 and the late-1970s and consists of a lighthouse as well as several supporting structures which accommodated the lighthouse operations during that period.

The Project consists of a soil remediation program and includes the following activities:

  • Tree clearing
  • Excavation of impacted soil
  • Backfilling with clean treated soil by hand or by a small excavator, and rolled for compaction
  • Natural revegetation to eliminate the risk of introducing invasive species

The work is anticipated to start in April 2022 and be completed by March 2023. 

The contaminated soil area in the Project Area is approximately 5,060 m2, with depths ranging from approximately 0.2 to 0.8 m, and an estimated contaminated soil volume of approximately 2,047 m3.


Latest update

The assessment is in progress.



Fisheries and Oceans Canada
Chris Davis, Environmental Officer, Real Property, Safety and Security
520 Exmouth Street
Sarnia, Ontario
Telephone: 519-331-0870

  • Location

    • Slate Island, Ontario (Ontario)
  • Nature of Activity

    • Forestry
    • Remediation and conservation
  • Assessment Status

    In progress
  • Start Date

  • Proponent

    Fisheries and Oceans Canada
  • Authorities

    • Fisheries and Oceans 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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