(a) Format and content. An EA may be prepared in any format provided that it covers, in a logical and succinct fashion, the information necessary for determining whether a proposed NIFA action may have a significant environmental impact and thus warrant preparation of an EIS. The information must include brief discussions on the need for the project, alternatives to the proposed action, environmental impacts of the proposed action and alternatives, and a listing of agencies and persons consulted (40 CFR 1508.9). Where possible, EAs should be limited to 10-15 pages. NOTE: It is the scope and complexity of the environmental issues, rather than the size of the project, that should be used to determine the length of the EA

(b) Supplements to environmental assessments. Where substantial changes occur in a project or activity for which an EA has been prepared and it is determined by a responsible NIFA official specified in § 3407.4(b) that the changes are pertinent to environmental concerns, a supplement to the EA may be required. Supplements to EAs shall be evaluated and processed as stated in paragraph (c) of this section.

(c) Decision notice. Upon completion of an EA and any supplement thereto, the responsible NIFA official will evaluate the information it contains, determine whether an EIS is required or whether no significant environmental impact is likely to occur, and will document the decision and the reasons upon which it is based (40 CFR 1508.13). The EA shall be available to the public.