Tokorozawa Cleaning Corporation was prosecuted for violating the Industrial Safety and Health Act by allowing workers to perform hopper suction work at the Tomatoh Atsuma Power Plant No. 1 construction site, where coal ash had accumulated, without implementing safety measures to prevent workers from being buried in the ash, which posed a risk of danger. The corporation received a summary order from the Tomakomai Summary Court, and a fine was finalized on April 19, 2024. This constitutes a violation of Article 28, Paragraph 1, Item 3 of the Construction Business Act.