Section 3001(b)(3)(A)(iii) of the Resource Conservation and Recovery Act (RCRA) excludes cement kiln dust (CKD) from regulation under Subtitle C of RCRA, pending completion of a Report to Congress and a determination by EPA either to promulgate regulations under Subtitle C or that such regulations are unwarranted. EPA completed its Report to Congress in December 1993 (EPA 1993a) and issued its determination on cement kiln dust in February 1995 (60 FR 7366). EPAs February 1995 determination concluded that additional control of CKD is warranted to protect the public from human health risks and to prevent environmental damages resulting from current CKD disposal practices. Citing damages to ground water and health risks from inhalation of airborne CKD and ingestion via food chain pathways, EPA determined that it will use its existing authority under the Clean Air Act, Clean Water Act, and RCRA to address potential contaminant releases from CKD (EPA 1995).