DRAFT Long-Term Surveillance Plan for the Split Rock, Wyoming, UMTRCA Title II Disposal Site, Jeffrey City, Wyoming
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LMS/SPR/S02613-0.0 Issue Date: Effective Date: DRAFT Long-Term Surveillance Plan for the Split Rock, Wyoming, UMTRCA Title II Disposal Site, Jeffrey City, Wyoming October 2020 This page intentionally left blank Long-Term Surveillance Plan for the Split Rock, Wyoming, UMTRCA Title II Disposal Site, Jeffrey City, Wyoming Document History Version No./ Revised Description of Change Revision No. 0.0 May 2020 Initial issue. 1.0 October 2020 Updated to include an amended agreement with Wyoming DEQ Approved: Nicole Keller Date Split Rock Site Lead Navarro Research and Engineering, Inc. This page intentionally left blank DRAFT Contents Abbreviations ................................................................................................................................. iv 1.0 Introduction ............................................................................................................................1 1.1 Purpose .........................................................................................................................1 1.2 Legal and Regulatory Requirements ............................................................................1 1.3 Role of the U.S. Department of Energy ........................................................................2 2.0 Final Site Conditions ..............................................................................................................3 2.1 General Description of the Disposal Site Vicinity .......................................................3 2.1.1 Site Ownership and Access .................................................................................5 2.1.2 Directions to the Disposal Site ............................................................................5 2.2 Site History ...................................................................................................................5 2.3 Site Description ............................................................................................................7 2.3.1 Description of Surface Conditions ......................................................................7 2.3.2 Permanent Site Surveillance Features ...............................................................10 2.4 Tailings Impoundment Design ...................................................................................10 2.4.1 Encapsulation Design ........................................................................................16 2.4.2 Storm Water Diversion System .........................................................................18 2.5 Site Geology, Hydrogeology, and Groundwater Conditions ......................................20 2.5.1 Geology .............................................................................................................20 2.5.2 Regional Hydrogeology ....................................................................................20 2.5.3 Local Hydrogeologic Conditions ......................................................................23 2.5.4 Groundwater Remedy .......................................................................................26 2.5.5 Final Groundwater Conditions ..........................................................................27 2.5.6 Surface Water ....................................................................................................28 2.6 Institutional Controls ..................................................................................................28 3.0 Long-Term Surveillance Program ........................................................................................29 3.1 General License for Long-Term Custody ...................................................................29 3.2 Requirements of the General License .........................................................................29 3.3 Annual Site Inspections ..............................................................................................29 3.3.1 Frequency of Inspections ..................................................................................29 3.3.2 Inspection Procedure .........................................................................................30 3.3.3 Inspection Checklist ..........................................................................................31 3.3.4 Personnel ...........................................................................................................31 3.4 Annual Inspection Report ...........................................................................................31 3.5 Follow-up Inspections ................................................................................................31 3.5.1 Criteria for Follow-up Inspections ....................................................................31 3.5.2 Personnel ...........................................................................................................32 3.5.3 Reports of Follow-up Inspections .....................................................................32 3.6 Routine Site Maintenance and Emergency Measures ................................................33 3.6.1 Routine Site Maintenance .................................................................................33 3.6.2 Emergency Measures ........................................................................................33 3.6.3 Criteria for Routine Site Maintenance and Emergency Measures ....................33 3.6.4 Reporting Maintenance and Emergency Measures ...........................................34 3.6.5 Earthquake Monitoring .....................................................................................34 3.7 Environmental Monitoring .........................................................................................35 U.S. Department of Energy LTSP—Split Rock, Wyoming, Disposal Site May 2020 Doc. No. S02613-0.0 Page i DRAFT 3.7.1 Long-Term Groundwater and Surface Water Monitoring Program .................36 3.7.1.1 Periodic Long-Term Monitoring Program Evaluations .....................41 3.7.1.2 Criteria for Discontinuing Long-Term Monitoring ............................41 3.8 Institutional Control Monitoring.................................................................................41 3.9 Records .......................................................................................................................42 3.10 Quality Assurance .......................................................................................................42 3.11 Health and Safety ........................................................................................................43 4.0 References ............................................................................................................................45 Figures Figure 1. General Location Map of the Split Rock, Wyoming, Disposal Site ............................. 4 Figure 2. Aerial View of 1978 Prereclamation Split Rock, Wyoming, Disposal ........................ 6 Figure 3. Timeline of Significant Actions at the Split Rock, Wyoming, Disposal Site ............... 8 Figure 4. Aerial View of Reclaimed Split Rock, Wyoming, Disposal Site ................................. 9 Figure 5. Split Rock, Wyoming, Disposal Site Topographic Map ............................................. 11 Figure 6. Split Rock, Wyoming, Disposal Site Map .................................................................. 12 Figure 7. Site Marker at the Split Rock, Wyoming, Disposal Site............................................. 13 Figure 8. Warning Sign at Split Rock, Wyoming, Disposal Site ............................................... 14 Figure 9. Disposal Cell at the Split Rock, Wyoming, Disposal Site .......................................... 15 Figure 10. Typical Cross Section of the Final Cover for the Tailings Impoundment at the Split Rock, Wyoming, Disposal Site .......................................................................... 17 Figure 11. Upper Portion of the North Diversion Channel at the Split Rock, Wyoming, Disposal Site ............................................................................................................... 18 Figure 12. Lower Portion of the North Diversion Channel at the Split Rock, Wyoming, Disposal Site ............................................................................................................... 19 Figure 13. Partial Stratigraphic Column of the Split Rock, Wyoming, Disposal Site ................. 21 Figure 14. Groundwater Flow Patterns, Split Rock, Wyoming, Disposal Site ............................ 24 Figure 15. Aquifers in the Vicinity of the Split Rock, Wyoming, Disposal Site ......................... 25 Tables Table 1. General License Requirements for the Split Rock Disposal Site .................................... 2 Table 2. Aquifer Hydrogeologic Characteristics for the Split Rock, Wyoming, Disposal Site... 22 Table 3. Final ACL Levels for the Split Rock Site Prior to Transfer to DOE ............................. 27 Table 4. Final Trigger Levels for the Split Rock Site Prior to Transfer to DOE ......................... 27 Table 5. Inspection Areas Used During First Inspection of the Split Rock, Wyoming, Disposal Site .................................................................................................................. 30 Table 6. DOE Criteria for Maintenance and Emergency Measures ............................................ 34 Table 7. Long-Term Groundwater and Surface Water Monitoring