 According to a company representative, another $12 million was spent in 2007 in an effort to further reduce air pollution from the smelter.In 2010, after issuance of new stricter EPA lead standards, Doe Run agreed to close the Herculaneum smelter and pay $65 million to correct past violations of the federal Clean Air and Clean Water acts.The same year, the company announced plans to replace the Herculaneum smelter with an electrowinning plant, which would replace smelting with a contained wet chemical process, reducing emissions by nearly 99 percent.