The purpose of considering alternatives to a proposed action is to explore and evaluate whether there may be reasonable alternatives to that action that may have fewer or less significant negative environmental impacts. When considering whether the alternatives are reasonable, the Agency will take into account factors such as economic and technical feasibility. The extent of the analysis on each alternative will depend on the nature and complexity of the proposal. Environmental review documents must discuss the consideration of alternatives as follows:

(a) For proposals subject to subpart C of this part, the environmental effects of the “No Action” alternative must be evaluated. All EAs must evaluate other reasonable alternatives whenever the proposal involves potential adverse effects to environmental resources.

(b) For proposals subject to subpart D of this part, the Agency will follow the requirements in 40 CFR part 1502.