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3/21/80 5050.4 halt construction if resources are uncovered in order for a qualified profes- sional to evaluate the importance of the resources and for recovery activity to occur. Such a commitment may enable the environmental document to be approved and the action to proceed without more extensive preliminary investigation. It is a matter of FAA judgment on a case -by -case basis whether such an approach is reasonable. If the FAA agrees, no further analysis is necessary; it may be'assumed for purposes of the environmental assessment that the impact isnot significant. 4 If consultation and/or a survey identify significant resources within the area of the proposed action's potential environmental impact, the National Register criteria shall be applied and the steps outlined under subparagraphs (b)1 through 4 followed pursuant to the provisions of the National'Historic Preservation Act of 1966, as amended. If a Determination of No Effect or No Adverse Effect can be made per subparagraph (b)2 or (b)3, respectively, it may be assumed that the impact is not significant. The environmental assessment shall document the appropriate determination. No further analysis is necessary. 5 If an adverse effect on significant resources is indicated, the sponsor shall consider project modifications that will avoid the loss or destruction of the resources and thereby not necessitate salvage. Resource salvage is generally less preferable than preservation in situ. If a commitment by the sponsor to preservation in situ reverses an adverse effect determination, the environmental assessment shall include the commitment and the supporting documentation of no adverse effect. No further analysis is necessary. 6 If a determination of adverse effect cannot be avoided, the instructions in subparagraph (b)4 apply and further consultation and analysis under the guidance of the FAA will be necessary as described in paragraph 85h. (d) If the proposal involves the taking or use of any publicly or privately owned land from a historic or archeological site of national, state, or local significance which is included in or eligible for inclusion in the National Register of Historic Places, section 4(f) of the DOT Act also applies. The section 4(f) instructions under paragraph 47e(7) above must be followed. (9) Biotic Communities (including both flora and fauna). (a) If the proposal would take or impact a publicly owned wildlife or waterfowl refuge of local, state, or national significance, the instructions in paragraph 47e(7) are to be followed to prepare the appropriate documentation required by section 4(f) of the DOT Act. (b) Consideration of endangered and threatened species is required for all proposals under the Endangered Species Act Amendments of 1978. Instructions in paragraph 47e(10) below relate specifically to this Act. Chap 5 Par 47 Page 41