Section 1.86 - Supplemental statementsExcept for proposals for legislation, as provided in CEQ Regulation ( 40 CFR 1502.9(c) ), the Commission shall publish supplements to either draft or final environmental statements if:
(a) The Commission makes substantial changes in the proposed action that are relevant to environmental concerns; or(b) There are significant new circumstances or information relevant to environmental concerns and bearing on the proposed action and its impacts. In the course of a trade regulation rule proceeding, the supplement will be placed in the rulemaking record.