CHICAGO — ExxonMobil Oil Corp. must investigate the cause of a burst of oil mist at the company’s refinery in Channahon Township on Oct. 19, and take specific actions to ensure it does not occur again.

Attorney General Lisa Madigan and Will County State’s Attorney James Glasgow on Thursday filed an agreed order including that those requirements.

More specifically, ExxonMobil must complete the investigation within 14 days to determine the root cause of the release and submit recommendations to Madigan’s and Glasgow’s offices for implementing corrective and preventive measures based on the investigation. A detailed corrective work schedule for necessary improvements must also be submitted.