The National Science Foundation (NSF) is a federal agency that provides oversight of the Laser Interferometer Gravitational-Wave Observatory, Hanford (LHO), which is operated by the California Institute of Technology (Caltech) and the Massachusetts Institute of Technology (MIT). The LHO is located on U.S. Department of Energy (DOE) property under a permit from DOE. The NSF and LHO propose to construct wind fences at the LHO facility X-end and Y-end stations. The proposal also includes installation of optical filter cavities (FC) on the existing Y-arm beam tube.