BP issued this update Tuesday evening:
Since BP’s last update on the recent crude oil release from the Whiting Refinery into Lake Michigan, there has been no further discharge of oil.
Based on preliminary information, BP believes an upset at a crude distillation unit may have sent crude oil into the refinery’s cooling water outfall and then into the lake. BP’s investigation of the incident continues and the refinery has taken steps to prevent another discharge.
Meanwhile, response efforts continue. Lines of boom have been deployed to contain the oil and wind has blown oil toward the shore, where crews are vacuuming it out of the water and cleaning the limited quantities that have reached land between the refinery’s wastewater treatment plant and a nearby steel mill.
BP has not yet determined precisely how much oil was discharged but expects to be able to provide an estimate as early as Wednesday.
After discovering the discharge late Monday afternoon, BP notified the U.S. Coast Guard, U.S. EPA and the Indiana Department of Environmental Management and all have been working closely to ensure the protection of personnel, the environment and surrounding communities.