40 CFR § 1502.19 - Appendix.
(b) Material substantiating any analysis fundamental to the impact statement.
(c) Material relevant to the decision to be made.
(d) For draft environmental impact statements, all comments (or summaries thereof where the response has been exceptionally voluminous) received during the scoping process that identified alternatives, information, and analyses for the agency's consideration.
(e) For final environmental impact statements, the comment summaries and responses consistent with § 1503.4 of this chapter.