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3/21/80 5050.4 2 The environmental assessment shall include the map information, analyses, and proposed mitigation measures described under sub- paragraph (c) above and shall also consider any risk to, or resulting from, the airport action in the base floodplain, including long term loss of available flood storage volume. In addition to measures listed under sub- paragraph,.(c), mitigation measures for base floodplain encroachments may include: ;: a Commitments to special flood related design criteria. b Elevation of facilities above base flood level. c Location of nonconforming structures and facilities out of the floodplain. d Minimizing fill in floodplains. 3 The environmental assessment shall indicate if the encroachment would result in one or more of the construction or flood related impacts listed below. If so, the encroachment is considered by DOT Order 5650.2 to be a significant encroachment. It is not contemplated that detailed design would be necessary in order to determine whether there is a significant encroachment. (A significant encroachment will require a Federal finding as part of any favorable decision on the action that there is no practicable alternative and that the action conforms to applicable state and/or local floodplain protection standards.) A significant encroachment involves: a A considerable probability of loss of human life. b Likely future damage associated with the encroachment that could be substantial in cost or extent, including interrup- tion of service on or loss of a vital transportation facility. c A notable adverse impact on natural and beneficial floodplain values. 4 The environmental assessment shall indicate if the proposed action is in a special flood hazard area designated by the FIA or proposed to be so designated. Special flood hazard areas are shown as zones A or V on Flood Hazard Boundary Maps. Under the Flood Disaster Protection Act of 1973, Federal agencies are prohibited from providing financial assistance for acquisition or construction of buildings in areas which have been designated by the FIA as special flood hazard areas for at least one year and which are in communities that are not participating in the national flood insurance program. 5 The environmental assessment shall identify any state and local floodplain regulations and standards that must be adhered to, indicate whether the proposed action will conform, and name the state and local agencies' having jurisdiction. Chap 5 Par 47 Page 51