The N.C. Department of Environmental Quality on Monday issued a notice of violation to Chemours Fayetteville Works ordering the company to immediately take new measures to control additional sources of GenX and other perfluorinated compounds from site contamination and air emissions. The state agency also issued a letter directing the company to begin a trial of new technology to curb emissions from the facility’s smokestacks and granted limited approval for Chemours to test carbon filtration systems on residential drinking water wells.