Toxic substances include asbestos, polychlorinated biphenols (PCBs), lead-based paint, and radon. Toxic substances are contained in some existing Academy infrastructure components, including utility systems, buildings, and equipment. The Academy maintains historical records of toxic substances and maintains management plans for asbestos and lead-based paint. The primary challenge for Academy personnel is to identify where these substances are present and, when identified, to remove or abate them as required by regulation or policy. Affected Academy personnel are educated to minimize their exposure to toxic substances and are evaluated, as necessary, to determine if exposures have occurred.