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Home My WebLink AboutDRC-2025-001260Facility White Mesa Uranium Mill - 4A Impoundment Storage Level 5592.29 ft (4/4/2025) Date Weather crisp and sunny day Name Representing Heather Mickelson UDWMRC Deen Lyman Engery Fuels Resources (USA), Inc. N/A Not Inspected Inundated Good Monitor Maintenance Critical Embankment ruts/erosion X cracks/settlements X poor alignment X road ruts X1 rodent burrows X2 vegetation/riprap X3 beaching/slides/cracks X3 undermining/erosion X3 rodent burrows X3 vegetation/erosion X sloughs/slides/cracks X seepage/wetness X rodent burrows X vegetation/riprap X erosion X seepage/wetness X Abutment/Foundation vegetation/erosion X sloughs/slides/cracks X seepage/wetness X vegetation/erosion X sloughs/slides/cracks X seepage/wetness X cracks/slumps X3 embankment drains X3 seepage/wetness X3 cracks/slumps X embankment drains X seepage/wetness X 8. D / S T o e 2. U / S S l o p e 3. D / S S l o p e 4. G r o i n s 5. L e f t Ab u t m e n t 6. R i g h t Ab u t m e n t 7. U / S T o e 1. C r e s t Dam Safety Inspection April 7, 2025 People Present Detail Element Reservoir Basins 9. Shore Stability X 10. Reservoir Bottom X Spillway 11. Freeboard X 12. Intake X4 13. Concrete Structures X5 14. Stilling Basin X 15. Outfall Channel X Instrumentation 22. Monuments X 23. Staff Gage X 24. Piezometers X 25. Drains X 26. Other X Notes U/S = Upstream D/S = Downstream From: Heather Mickelson, P.E, P.G. __________________________________Date :________________ Through: Adam Wingate, Uranium Recovery Section Manager__________________________Date :________________ 1. Recommend maintance to repair road ruts on crest as conditions allow. 2. Recommend continuted efforts to eradicate burrowing animals. 3. Upstream face and toe are concealed by synthetic liner. 4. System is total containment. 5. Recommend repairing the filling in cracks in concrete spillways of 4A/4B and 4A/3, as planned during the second quarter. Adam Wingate (Apr 17, 2025 10:12 MDT)04/17/2025 Facility White Mesa Uranium Mill - 4B Impoundment Storage Level 5579.23 ft (4/4/2025) Date Weather crisp and sunny day Name Representing Heather Mickelson UDWMRC Deen Lyman Engery Fuels Resources (USA), Inc. N/A Not Inspected Inundated Good Monitor Maintenance Critical Embankment erosion X cracks/settlements X poor alignment X road ruts X1 rodent burrows X2 vegetation/riprap X3 beaching/slides/cracks X3 undermining/erosion X3 rodent burrows X3 vegetation/erosion X sloughs/slides/cracks X seepage/wetness X rodent burrows X vegetation/riprap X erosion X seepage/wetness X Abutment/Foundation vegetation/erosion X sloughs/slides/cracks X seepage/wetness X vegetation/erosion X sloughs/slides/cracks X seepage/wetness X cracks/slumps X embankment drains X seepage/wetness X cracks/slumps X embankment drains X seepage/wetness X Element Detail Dam Safety Inspection People Present April 7, 2025 5. L e f t Ab u t m e n t 6. R i g h t Ab u t m e n t 7. U / S T o e 8. D / S T o e 1. C r e s t 2. U / S S l o p e 3. D / S S l o p e 4. G r o i n s Reservoir Basins 9. Shore Stability X 10. Reservoir Bottom X Spillway 11. Freeboard X 12. Intake X4 13. Concrete Structures X5 14. Stilling Basin X 15. Outfall Channel X Instrumentation 22. Monuments X 23. Staff Gage X 24. Piezometers X 25. Drains X 26. Other X Notes U/S = Upstream D/S = Downstream From: Heather Mickelson, P.E, P.G. __________________________________Date :________________ Through: Adam Wingate, Uranium Recovery Section Manager__________________________Date :________________ 1. Recommend maintance to repair road ruts on crest as conditions allow. 2. Recommend continuted efforts to eradicate burrowing animals. 3. Upstream face and toe are concealed by synthetic liner. 4. System is total containment. 5. Recommend repairing the filling in cracks in concrete spillways of 4A/4B, as planned during the second quarter. Adam Wingate (Apr 17, 2025 10:12 MDT)04/17/2025 Photo 1. Left abutment of Impoundment 4A. Photo taken on April 7, 2025, and is looking northeast. Photo 2. Left abutment of Impoundment 4A Photo taken on April 7, 2025, and is looking west. Photo 3. Crest at left abutment of Impoundment 4A. Photo taken on April 7, 2025, and is looking north. Photo 4. Crest of Impoundment 4A. Photo taken on April 7,2025, and is looking south. Photo 5. Crest of Impoundment 4A. Photo taken on April 7, 2025, and is looking west. Photo 6. Crest of Impoundment 4A. Photo taken on April 7, 2025, and is looking east from the common abutment of 4A/4B. Photo 7. Impoundment 4A/4B spillway. Photo taken on April 7, 2025, and is looking north. Photo 8. Impoundment 4A/4B spillway. Photo taken on April 7, 2025, and is looking north. Photo 9. Tailings beach and liner covering the southern upstream slope of Impoundment 4A. Photo taken on April 7, 2025, and is looking north from the crest. Photo 10. Tailings beach in Impoundment 4A. Photo taken on April 17, 2025, and is looking south from the Impoundment 3/4A spillway. Photo 11. Impoundment 3/4A spillway. Photo taken on April 7, 2025, and is looking east. Photo 12. Liner covering the southern and eastern upstream slope of Impoundment 4A. Photo taken on April 16, 2024, and is looking south. Photo 13. Liner covering of the northern and eastern upstream slope of Impoundment 4A. Photo taken on April 7, 2025, and is looking north. Photo 14. Liner covering the southern and western upstream slope of Impoundment 4A. Photo taken on April 7,2025, and is looking west. Photo 15. Southern downstream slope of Impoundment 4A. Photo taken on April 7, 2025, and is looking north from the bottom of the downstream slope. Photo 16. Southern downstream slope of Impoundment 4A/4B at the common abutment. Photo taken on April 7, 2025, and is looking north. Photo 17. Crest of Impoundment 4B. Photo taken on April 7, 2025, and is looking north. Photo 18. Crest of Impoundment 4B. Photo taken on April 7, 2025, and is looking west. Photo 19. Crest of Impoundment 4B. Photo taken on April 7, 2025, and is looking west. Photo 20. Crest of Impoundment 4B at the impoundment’s southwest corner. Photo taken on April 7, 2025, and is looking northwest. Photo 21. Southern downstream slope of Impoundment 4B. Photo taken on April 7, 2025, and is looking east. Photo 22. Southern downstream slope of Impoundment 4B. Photo taken on April 7, 2025, and is looking north. Photo 23. Downstream right abutment of Impoundment 4B. Photo taken on April 7, 2025, and is looking north. Photo 24. Burrowing animal holes (highlighted) next to the fence western crest of Impoundment 4B. Photo taken on April 7, 2025, and is looking east. Photo 25. Liner covering the northern and eastern upstream slope of Impoundment 4B. Photo taken on April 7, 2025, and is looking north. Photo 26. Liner covering the southern and western upstream slope of Impoundment 4B at the common abutment. Photo taken on April 7, 2025 and is looking west. Photo 27. Liner covering the northern and western upstream slope of Impoundment 4B. Photo taken on April 7, 2025 and is looking west. Photo 28. Woody vegetation noted for removal on the north side of Impoundment 4B. Photo taken on April 7, 2025, and is looking south.