The Globe and Mail reports in its Thursday edition that the Athabasca Chipewyan First Nation is suing Alberta's energy regulator for not telling it for almost a year that water tainted with dangerous levels of arsenic and other toxins was seeping from Imperial Oil's Kearl oil sands project into public lands and waterways near the community. The Globe's Emma Graney writes that the nation says in a court filing that the incident was not isolated, but rather a symptom of broader deficiencies in what it calls an "unconstitutional" legislative and regulatory regime for the management of mining waste, known as tailings, and other energy project approvals in Alberta. The Alberta Energy Regulator and Imperial Oil learned that the project's tailings area was leaking in May, 2022. However, neither of them informed the community until after a second incident on the site nine months later. In the second case, a drainage pond overflowed and sent an estimated 5.3 million litres of industrial wastewater laced with pollutants, including dissolved metals and hydrocarbons, into the environment about 70 kilometres north of Fort McMurray. The first nation argues that the AER had a duty of care to warn the community about the tailings.