The U-S Environmental Protection Agency has ended its oversight of clean-up at the eastern Iowa recycling facility that exploded in late 2022. Asphalt shingles were being recycled at the C6-Zero plant in Marengo. Twenty employees were injured and part of Marengo had to be evacuated when the plant exploded. Six months later, after delays in the timeline for clean-up, state officials asked the federal government to start overseeing the removal of contaminated water and soil from the site.