The Environmental Protection Agency on Monday plans to relax rules that govern how power plants store waste from burning coal and release water containing toxic metals into nearby waterways, according to agency officials. The proposals, which scale back two rules adopted in 2015, affect the disposal of fine powder and sludge known as coal ash , as well as contaminated water that power plants produce while burning coal. Both forms of waste can contain mercury, arsenic and other heavy metals that pose risks to human health and the environment. The new rules would allow extensions that could keep unlined coal ash waste ponds open for as long as eight additional years. The biggest benefits from the rule governing contaminated wastewater would come from the voluntary use of new filtration technology. Trump administration officials revised the standards in response to recent court rulings and to petitions from companies that said […]