Los Alamos National Laboratory issued a Statement of Findings based on the Floodplain Assessment for the Pajarito Tank 4A 18-inch Transmission Water Main Repair, Two Mile Canyon, Los Alamos National Laboratory.
Office of NEPA Policy and Compliance
September 18, 2026
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Statement of Findings for the Pajarito Tank 4A 18-inch Transmission Water Main Repair, Two Mile Canyon, Los Alamos National Laboratory, Los Alamos County, New Mexico
The National Nuclear Security Administration (NNSA), a semi-autonomous agency within the U.S. Department of Energy (DOE), issued a Statement of Findings to facilitate the Incorporated County of Los Alamos, Department of Public Utilities (LAC DPU) repair of a failed 18-inch transmission water main serving Pajarito Tank 4A on U.S. Department of Energy (DOE)/National Nuclear Security Administration (NNSA) property at Los Alamos National Laboratory (LANL). The failed segment lies at the bottom of Two Mile Canyon, west of Mercury Road, within the canyon-bottom drainage corridor identified by LANL as a floodplain. The proposed project would result in negligible direct and indirect impacts to the Two Mile Canyon floodplain. Temporary disturbances with the floodplain would cease following completion of construction activities. Best management practices would be implemented. This proposed project would not modify flow paths within the floodplain from pre-project to post-project conditions. No effects on lives and property associated with floodplain modifications are anticipated.
For more information, see the Floodplain Assessment for the Pajarito Tank 4A 18-inch Transmission Water Main Repair, Two Mile Canyon, Los Alamos National Laboratory.