Agency wants sites contaminating Middle Fork of Vermilion River closed, the riverbank fixed, and fines levied. DANVILLE — Punishment might be coming for Vistra Energy Corp., owner of the former Dynegy power plant near Danville, over coal-ash pits contaminating the Middle Fork of the Vermilion River. The Illinois Environmental Protection Agency, which has been investigating the matter, said Thursday that it has referred the case to the state attorney general for enforcement. read more