Details for Legal No. 1170 National Guard

Legal No. 1170 National Guard Bureau Public Notice: Five-Year Review for Camp Navajo, Bellemont, Arizona The National Guard Bureau has completed the Third Five-Year Review for Camp Navajo, located in Bellemont, Arizona. This statutory Five-Year Review was conducted in accordance with the Comprehensive Environmental Response, Compensation, and Liability Act and the National Oil and Hazardous Substances Pollution Contingency Plan. The purpose of a Five-Year Review is to determine whether selected remedies for a site remain protective of human health and the environment. Five-year reviews identify issues found during the review, if any, and provide recommendations to address them. This Five-Year Review evaluated the following five Camp Navajo sites and their remedies: NAAD-01 (Old Explosive Ordnance Disposal Demolition Area): The remedy at NAAD-01 is protective of human health and the environment. NAAD-01 (Munitions Response Work Area [MRWA] 01) is sub-divided into MRWA 01-01 and MRWA 01-02. The response action for MRWA 01-01 is site-related Land Use Controls (LUCs) and the response action for MRWA 01-02 is mission-related LUCs. These response actions also involve site closeout tasks, recurring reviews, and range management and safety requirements, which include existing site physical controls and access prevention measures, security patrols, and munitions and explosives of concern (MEC) awareness and safety training. Annual inspections indicate physical and administrative LUCs are in place to prevent unauthorized activities from occurring to ensure the protection of human health and the environment. NAAD-11B (Building 318/319 2,4,6-Trinitrotoluene [TNT] Washout Facility): The remedy at NAAD-11B is protective of human health and the environment. Annual long-term management (LTM) groundwater monitoring indicates the plume of explosive contaminants at NAAD-11B is stable; therefore, the removal action was effective in reducing the availability of contaminants to migrate into groundwater. Annual inspections indicate monitoring wells are being maintained as needed to ensure their functionality for groundwater monitoring events and that LUCs are in place to restrict the use of shallow groundwater within NAAD-11B. NAAD-20 (Pyrotechnic Range): The remedy at NAAD-20 is protective of human health and the environment. The response action for NAAD-20 is No Department of Defense Action Indicated/Mission-related LUCs. This response action involves site closeout tasks, recurring reviews, and range management and safety requirements, which include existing site physical controls and access prevention measures, security patrols, and MEC awareness and safety training. Annual inspections indicate physical and administrative LUCs are in place to prevent unauthorized activities and ensure the protection of human health and the environment. NAAD-40 (Former Sanitary Landfill): The remedy at NAAD-40 is protective of human health and the environment. Annual inspections indicate the physical conditions of the landfill cap are stable and the surface water drainage system is being maintained as needed to prevent erosion to ensure the landfill cap's integrity. Annual LTM groundwater monitoring indicates the concentrations of contaminants of concern are stable and the landfill cap is functioning as designed to mitigate infiltration and migration of potential contaminants. Annual inspections indicate LUCs are in place to restrict the use of shallow groundwater and maitain integrity of the landfill cap and monitoring well surface completions. NAAD-43 (Former Construction Debris Landfill #5): The remedy at NAAD-43 currently protects human health and the environment. Annual inspections indicate that potential exposures are mitigated by the removal of surficial debris and LUCs mitigate adverse impacts to the land surface and drainage features. However, for the remedy to be protective in the long-term, drainage controls at NAAD-43 should be improved to prevent temporary storm water runoff accumulation and ensure long-term protectiveness. The Third Five-Year Review Report was signed September 28, 2020 and is available to the community at Camp Navajo's Administrative Record and two information repositories: Camp Navajo Administrative Record 1 Hughes Avenue, Building 15 Bellemont, Arizona 86015 Northern Arizona University, Cline Library Special Collections and Archives 1001 S. Knoles Drive Flagstaff, Arizona 86011 Arizona Department of Environmental Quality Records Center 1110 W. Washington Street Phoenix, Arizona 85007 Should members of the community have questions or comments about the Third Camp Navajo Five-Year Review or are interested in additional site information, please contact Ms. Kim Birdsall at (602) 267-2498, or via email at: birdsallk@emo.azdema.gov. PUB: Nov, 22, 2020 1170

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