49 C.F.R. § 266.19
(b) Substitute service assistance, rail facility construction assistance, and non-exempt rehabilitation or improvement assistance—(1) Environmental assessment.
(i) When an applicant requests substitute service assistance, rail facility construction assistance, or rehabilitation or improvement assistance (except for rehabilitation or improvement assistance which is exempt under paragraph (a) of this section), the applicant shall:
(B) Provide sufficient documentation to enable the Administrator to determine that the project satisfies the following criteria:
(1) The action is not likely to be environmentally controversial from the point of view of people living within the environment affected by the action or controversial with respect to the availability of adequate relocation housing;
(2) The action is not inconsistent with any Federal, State, or local law, regulation, ordinance, or judicial or administrative determination relating to environmental protection;
(3) The action will not have any significant adverse impact in any natural, cultural, recreational, or scenic environment(s) in which the action takes place, or on the air or water quality or ambient noise levels of such environment(s);
(4) The action will not: use 4(f)-protected properties; adversely affect properties under section 106 of the National Historic Preservation Act; involve new construction location in a wetlands area; or affect a base floodplain;
(5) The action will not cause a significant short- or long-term increase in traffic congestion, or other significant adverse environmental impact on any mode of transportation;
(6) The action is not an integral part of a program of actions which, when considered separately, would not be classified as major FRA actions, but when considered together would be so classified; and
(7) Environmental assessment or documentation is not required by any Federal law, regulation, guideline, order, or judicial or administrative determination other than this part.
(4) Section 4(f) determination. For projects involving the use of any land from a public park, recreation area, wildlife and waterfowl refuge, or historic site of national, State or local significance as determined by the Federal, State, or local officials having jurisdiction thereon, information to support a determination pursuant to section 4(f) of the Act shall be submitted together with the application. The section 4(f) determination shall document that: