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Cape Environmental groundwater treatment technician Marcos Arias collects water samples from the GAC treatment systems installed at the former Mather Air Force Base, California. The newly installed system is part of a Air Force Civil Engineer Center Base Realignment and Closure program contract award to address perfluorooctanoic sulfonate and perfluorooctanoic acid, or PFOS and PFOS, found there. (U.S. Air Force photo by Dante Gulle)
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