49 C.F.R. § 264.101
The procedures for complying with the National Environmental Policy Act of 1969, as amended (42 U.S.C. 4321 et seq.), and related statutes, regulations, and orders are set forth in part 771 of title 23 of the Code of Federal Regulations. The procedures for complying with 49 U.S.C. 303 , commonly known as "Section 4(f)," are set forth in part 774 of title 23 of the Code of Federal Regulations. The procedures for complying with the Surface Transportation Project Delivery Program application requirements and termination are set forth in part 773 of title 23 of the CFR. The procedures for participating in and complying with the program for eliminating duplication of environmental reviews are set forth in part 778 of title 23 of the CFR.
49 C.F.R. §264.101