Two environmental groups have filed a federal lawsuit against ArcelorMittal accusing the steelmaker of more than 100 permit violations at its Burns Harbor steel mill. The Hoosier Environmental Council and the Chicago-based Environmental Law & Policy Center cite among the violations excessive pollution that killed 3,000 fish and closed beaches on Lake Michigan and Indiana Dunes National Park. The groups say ArcelorMittal is in violation of the Clean Water Act by, among other things, exceeding its permit limits for cyanide and ammonia, which rendered waters unsafe for human or aquatic life. The company’s Burns Harbor facility is located along the Lake Michigan shoreline near the Indiana Dunes. The Burns Harbor mill discharges pollution into the East Arm of the Little Calumet River, which flows directly into Lake Michigan.