Oil sensors sound all clear after oil spill

After a 5,300-gallon oil spill in the St. Marys River on June 9, Lake Superior State University’s Center for Freshwater Research and Education and LimnoTech placed sensors to monitor its containment. As of the end of July, the sensors continue not to detect any signs of lingering hydrocarbons from the spill. Read the full story by SooToday.