Shell Canada has been ordered to pay fines and a donation totalling over $800,000 after pleading guilty in provincial offences court to permitting a discharge of a contaminant at the Corunna site.
The Ontario Environment Ministry says that in January 2013, the company discovered a flare knock-out line leak of liquid containing mercaptan.
The ministry says it caused a foul odour and flowed into a ditch on-site.
Shell Canada was fined $500,000, ordered to pay an additional $125,000 victim fine surcharge and issued a probation order requiring it to donate $200,000 to the Aamjiwnaang First Nation.