More than 200 participants from the Coast Guard; Enbridge; the Charlevoix, Cheboygan, Emmet County Office of Emergency Management; Michigan Department of Environmental Quality; and the Environmental Protection Agency, will participate in the exercise, which simulates a breach in Enbridge's Line 5 and a worst-case discharge of light crude oil. Participating agencies spent 18 months planning the exercise, which tests booming strategies to validate existing oil spill response plans.