on such features and within such habitats, do not significantly impede geomorphic and ecological processes. . 102. John H. Chafee Coastal Barrier Resources System Section 4 of the Coastal Barrier Resources Act ( 16 U.S.C. 3503 ) is amended— (1) in subsection (a), to read as follows: (a) Establishment There is established the John H. Chafee Coastal Barrier Resources System, which shall consist of those undeveloped coastal barriers and other areas located on the coasts of the United States that are identified and generally depicted as System units or Otherwise Protected Areas— (1) on the maps on file with the Secretary entitled Coastal Barrier Resources System , dated October 24, 1990