In the U.S., and many other countries, fly ash from coal fired boilers is sluiced to ash ponds where it accumulates. One outcome of this process is groundwater contamination by toxic metals. New regulations in the U.S. are requiring the dewatering of existing ponds, or lining them, to eliminate groundwater contamination. So much fly ash has been stored that the EPA estimates that the cost to manage the disposal sites will be over USD $500 million per year for the next 100 years.
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