The plaintiff sued London Transit Commission (LTC) for environmental contamination. LTC was served with the statement of claim on May 22, 2013. LTC issued a third party claim against Eaton (the former owner of the land) on March 16, 2016. Eaton brought a motion for summary judgment, arguing that the claim was barred by the limitation period. LTC argued that the claim was not discoverable. Justice Mitchell granted summary judgment, finding that LTC did not act with the due diligence required of a reasonable person with its abilities and in its circumstances, and therefore did not rebut the presumption under s. 18 of the Limitations Act, 2002.