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June 25, 2017

Port Granby

As a result of extreme weather and record rainfall in the Durham Region and Northumberland County, on June 23, 2017, surface water overflowed from a catch basin in the East Gorge on the site of the existing Port Granby Waste Management Facility, located on the south side of Lakeshore Road. A small volume of untreated ground/surface water, estimated to be between two and five cubic metres, flowed from the catch basin to Lake Ontario during this short-lived event.

At no time was there a health or safety risk to workers or the public, and the results of independent analysis of water samples taken at the catch basin are expected to show that the effect on the environment was negligible, as the overflow had been diluted significantly by the heavy rainfall.

CNL proactively notified the Canadian Nuclear Safety Commission, and will continue to provide updates to this disclosure notice as more information becomes available.