This part is authorized under section 123 of the Comprehensive Environmental Response, Compensation, and Liability Act of 1980 (CERCLA) (Pub. L. 96-510, 42 U.S.C. 9601-9675), as amended by the Superfund Amendments and Reauthorization Act of 1986 (SARA) (Pub. L. 99-499, 42 U.S.C. 9601).