Imperial, Alberta regulator knew for years about at Kearl Lake oilsands release: documents

Data filed to the Oilsands Monitoring Program shows sulphates at a sampling station in the Muskeg River began climbing drastically in March 2022.

Documents filed by Imperial Oil Ltd. show the company and Alberta’s energy regulator knew the Kearl oilsands mine was seeping tailings into groundwater years before a pool of contaminated fluid was reported on the surface, alarming area First Nations and triggering three investigations.

“They knew there was seepage to groundwater,” said Mandy Olsgard, an environmental toxicologist who has consulted for area First Nations.

“The (Alberta Energy Regulator) and Imperial decided not to notify the public and just manage it internally.”

Imperial said in a statement that seepage was anticipated in Kearl’s original design. Spokeswoman Lisa Schmidt said the company has kept both the regulator and area communities informed.

“We have been working to address the areas of shallow seepage from our operating lease area,” she said. “We recognize there are concerns regarding water quality, and we take this very seriously.”

Alberta Energy Regulator spokeswoman Lauren Stewart said the agency is committed to strong oversight of the Kearl site.

“It is of upmost priority that downstream water continues to remain safe, and any potential impacts to the public are both mitigated and communicated transparently,” she said in an email.

“During this period, there were no signs that indicated the system was not functioning according to its intended design.”