MONONGAHELA, Pa. — HAZMAT crews were called to the Monongahela Sewage Plant on Wednesday. The Monongahela Fire Department said crews were called to the plant at 1:30 p.m. for a chlorine tank leak. Washington County HAZMAT units followed to take care of that leak. Firefighters said there were no evacuation or shelter-in-place orders given at any point. The situation was wrapped up and the plant returned to normal operations at around 5 p.m.