not later than January 1, 1988, the President shall complete preliminary assessments of all facilities that are contained (as of October 17, 1986) on the Comprehensive Environmental Response, Compensation, and Liability Information System (CERCLIS) including in each assessment a statement as to whether a site inspection is necessary and by whom it should be carried out; and

not later than January 1, 1989, the President shall assure the completion of site inspections at all facilities for which the President has stated a site inspection is necessary pursuant to paragraph (1).