T-Mobile is proposing modifications and upgrades at an existing monopole telecommunications facility located at an address 15366 11th Street, Victorville, San Bernardino County, CA 92311 (Latitude 34° 31' 49.70" N, Longitude 117° 17' 36.48" W). Support equipment will be installed within the facility's existing equipment compound and a route for power/utilities conduit is also planned. Eocene Environmental Group is publishing this notice in accordance with Federal Communications Commission regulations (47 CFR § 1.1307) for Section 106 of the National Historic Preservation Act (NHPA) and for the National Environmental Policy Act (NEPA). Parties interested in commenting on this Federal undertaking or with questions on the facility should contact Eocene, Attn: Telecommunications Department, 8951 Windsor Parkway, Johnston, IA 50131 or call 515-473-6256 (Ref. TriLA #2254-AM). September 24 2025 LYRK0370181