A local superfund site has been cited as being vulnerable to the effects of climate change. The 150-year-old Iron Mountain Mine, where operators prevent tons of toxic sludge from pouring into the Sacramento River system, was cited in a report issued Monday by the Government Accountability Office. Scientists say that the state’s increasing, and increasingly intense, wildfires are a sign of what the country will be seeing as the climate deteriorates. The GAO said last year’s Carr Fire overran the superfund site, nearly destroying its water-treatment system and risking a massive, poisonous explosion if flames reached the heart of the mine. Firefighters used special gear to stop the flames. Operators of the site have since swapped out PCB pipes that carry away the toxic waste for flame-resistant steel ones. The GAO report calls on Environmental Protection Agency Administrator Andrew Wheeler to state directly that dealing with the rising risks of seas, storms or wildfires breaching superfund sites under climate change is part of the agency’s mission.