40 C.F.R. § 25.8
Each agency which conducts any activities required under this part shall prepare a Responsiveness Summary at specific decision points as specified in program regulations or in the approved public participation work plan. Responsiveness Summaries are also required for rulemaking activities under § 25.10 . Each Responsiveness Summary shall identify the public participation activity conducted; describe the matters on which the public was consulted; summarize the public's views, significant comments, criticisms and suggestions; and set forth the agency's specific responses in terms of modifications of the proposed action or an explanation for rejection of proposals made by the public. Responsiveness Summaries prepared by agencies receiving EPA financial assistance shall also include evaluations by the agency of the effectiveness of the public participation program. Assisted agencies shall request such evaluations from any advisory group and provide an opportunity for other participating members of the public to contribute to the evaluation. (In the case of programs with multiple responsiveness summary requirements, these analyses need only be prepared and submitted with the final summary required.) Responsiveness summaries shall be forwarded to the appropriate decision-making official and shall be made available to the public. Responsiveness Summaries shall be used as part of evaluations required under this part or elsewhere in this chapter.
40 C.F.R. §25.8