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Ontario regulators fined Shell $620,000  on Tuesday for a 2013 odor leak at the Sarnia refinery.

The Ontario Ministry for Environment and Climate Change told Reuters that the company pleaded guilty to one offense of allowing an odor containing mercaptan to be discharged.

Employees at Shell’s Sarnia Manufacturing Center in Corunna discovered a leak from a line containing mercaptan on January 11, 2013.

The chemical traveled to a ditch at the refinery that empties into the facility’s storm sewer system, Reuters said.

There were several reports of nausea, vomiting, sore throats and sore eyes from members of the nearby Aamjiwnaang First Nation following the leak.

The agency fined Shell $375,150 for the leak in addition to a $150,000 donation to the Aamjiwnaang First Nation and a victim surcharge of about $93,000.

According to Shell, the Sarnia Manufacturing Center has a capacity of 75,000 barrels of crude oil per day and produces gasoline, distillates, liquid petroleum gas, heavy oils, pure chemicals, solvents.