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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.

IEPA spokeswoman Kim Biggs said the agency is asking the attorney general to enforce three actions:

— Close the coal-ash pits.

— See through an ongoing effort to stabilize the riverbank.

— Pay a fine for past violations. The fine amount was not listed.

The action is good news for environmental groups that have pushed for the coal-ash pits to be removed instead of just covered.

Dynegy Midwest Generation merged with Vistra in 2018.