The Boulder County Sheriff's Office is investigating two incidents of illegal chemical dumping in the flood zone near Lyons.
Authorities say someone dropped off a 30-gallon barrel containing zinc cyanide, an extremely poisonous chemical, at Black Bear Inn in Lyons on Nov. 7. The barrel was found next to flood debris.
Four days later, police say a similar discovery was made at an Environmental Protection Agency dump site. It was later determined the chemical inside the 20-gallon barrel was copper cyanide, which is also extremely toxic.
Investigators reportedly say they believe someone is dumping the toxic waste next to flood debris hoping no one will notice.