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Home My WebLink AboutDRC-2024-005501Facility Lisbon Valley Lower Embankment - Rio Algom Storage Level Embankment is full of tailings Date Weather Rain/Snow Name Representing Heather Mickelson UDWMRC Jarrett Bean BHP Kent Applegate BHP Amy Maerk BHP N/A Not Inspected Inundated Good Monitor Maintenance Critical Embankment ruts/erosion X cracks/settlements X poor alignment X road ruts X vegetation/riprap X1 beaching/slides/cracks X1 undermining/erosion X1 rodent burrows X1 vegetation/erosion X2 sloughs/slides/cracks X seepage/wetness X rodent burrows X3 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 X1 embankment drains X1 seepage/wetness X1 cracks/slumps X embankment drains X seepage/wetness X 2. U / S S l o p e 3. D / S S l o p e 4. G r o i n s Element 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 Detail Dam Safety Inspection People Present April 15, 2024 1. C r e s t Reservoir Basins 9. Shore Stability X 10. Reservoir Bottom X Spillway 11. Freeboard X 12. Intake X 13. Concrete Structures X 14. Stilling Basin X 15. Diversion Channel X2,4 Instrumentation 22. Monuments X 23. Staff Gage X 24. Piezometers X 25. Drains X 26. Other X5,6 X7 Notes U/S = Upstream D/S = Downstream Phil Goble Date Radioactive Materials Section Manager Adam Wingate Date Uranium Recovery Section Manager 1. Upstream slope and toe are not visible. The impoundment is full of tailings. 2. Deep-rooted vegetation removal is needed. 3. No evidence of burrowing animals was noted. There is a nearby bobcat, which has a yearly litter, that is believed to limit burrowing animals. 4. At the terminus of the lower diversion chanel the native material is eroding. Continue monitoring to confirm that the engineered diversion chanel is not eroding. 5. Rabbit brush covers much of the impoundment, which makes it difficult to observe its condition. 6. The cover on the impoundment's surface was squishy when it was walked on. The groin and downstream slope were not squishy. 7. Maintenance to remove the road ruts on top of the impoundment is necessary. Heather Mickelson, P.E., P.G. Date Facility Lisbon Valley Upper Embankment - Rio Algom Storage Level Embankment is full of tailings Date Weather Rain/Snow Name Representing Heather Mickelson UDWMRC Jarrett Bean BHP Kent Applegate BHP Amy Maerk BHP N/A Not Inspected Inundated Good Monitor Maintenance Critical Embankment ruts/erosion X cracks/settlements X poor alignment X road ruts X vegetation/riprap X1 beaching/slides/cracks X1 undermining/erosion X1 rodent burrows X1 vegetation/erosion X2 sloughs/slides/cracks X seepage/wetness X rodent burrows X3 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 X1 embankment drains X1 seepage/wetness X1 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 15, 2024 People Present Detail Element Reservoir Basins 9. Shore Stability X 10. Reservoir Bottom X Spillway 11. Freeboard X 12. Intake X 13. Concrete Structures X 14. Stilling Basin X 15. Diversion Channel X2,4 Instrumentation 22. Monuments X 23. Staff Gage X 24. Piezometers X 25. Drains X 26. Other X5,6 Notes U/S = Upstream D/S = Downstream Phil Goble Date Radioactive Materials Section Manager Adam Wingate Date Uranium Recovery Section Manager Heather Mickelson, P.E., P.G. Date 1. Upstream slope is not visible. The impoundment is full of tailings. 2. Deep-rooted vegetation removal is needed. 3. No evidence of burrowing animals was noted. There is a nearby bobcat, which has a yearly litter, that is believed to limit burrowing animals. 4. Vegetation in the upper diversion channel should be monitored to confirm that it doesn't limit flowing water. There is a lot of rabbit brush growing in the channel. 5. Rabbit brush covers much of the impoundment, which makes it difficult to observe its condition. 6. The cover on the impoundment's surface was squishy when it was walked on. The groin and downstream slope were not squishy. Photo 1. Face of the lower impoundment. Photo taken on April 15, 2024, and is looking east. Photo 2. Crest of the lower impoundment. Photo taken on April 15, 2024, and is looking southeast. Photo 1. Left groin of the lower impoundment looking up toward the east. Photo taken on April 15, 2024. Photo 1. Right groin of the lower impoundment looking up toward the north. Photo taken on April 15, 2024, and is looking east. Photo 5. Toe of the lower impoundment covered with rabbit brush. Photo taken on April 15, 2024, and is looking northwest. Photo 6. Lower diversion channel from the lower impoundment. Phto taken on April 15, 2024, and is looking south. Photo 7. Diverson channel of the lower impoundment. Photo taken on April 15, 2024, and is looking south. Photo 8. Terminus of the diversion channel of the lower impoundment. Erosion of native material is occurring below the terminus and is highlighted. Photo taken on April 15, 2024, and is looking southwest. Photo 9. Face of the upper impoundment (background) and cover of the lower impoundment (foreground). Photo taken on April 15, 2024, and is looking east. Photo 10. Crest of the upper impoundment. Photo taken on April 15, 2024, and is looking north. Photo 10. Left groin of the upper impoundment. Photo taken on April 15, 2024, and is looking west. Photo 11. Right ground of the upper impoundment. Photo taken on April 15, 2024, and is looking up toward the northeast Photo 13. Toe of the upper impoundment. Photo taken on April 15, 2024, and is looking south. Photo 14. Highest point of the upper diversion channel. Photo taken on April 15, 2024, and is looking north. Photo 15. Upper diversion channel above the upper embankment. Photo taken on April 15, 2024, and is looking south. Photo 16. Upper diversion channel adjacent to the upper most portion of the upper embankment. Photo taken on April 15, 2024, and is looking up toward the north. Photo 17. Upper diversion channel adjacent to the upper most portion of the upper embankment. Photo taken on April 15, 2024, and is looking down toward the south. . Photo 18. Upper diversion channel adjacent to the Rio Algom Shaft Road. Photo taken on April 15, 2024, and is looking up toward the east. Photo 19. Upper diversion channel adjacent to the Rio Algom Shaft Road. Photo taken on April 15, 2024, and is looking down toward the south. Photo 20. Monument placed in 2006 that is below the lower embankment. Photo taken on April 15, 2024.