2007-11-07_HYDROLOGY - M1977300

• Permit No: M1977300
• IBM Index Class Name: HYDROLOGY
• Doc Date: 11/7/2007
• Doc Name: Hydrologic evaluation of mine closure & reclamation
• From: Whetstone Associates
• To: Cotter Corpoartion
• Media Type: D
• Archive: No

Schwartzwalder Mine -Hydrologic Study of Mine Closure and Reclamation v
Figure 9. Seasonal Variation in Water Levels in Deep Bedrock Monitoring Well MW 11 ..........................18
Figure 10. Sump Locations ...........................................................................................................................22
Figure 11. Sump Pumping Rates, 1995 - 2002 .............................................................................................25
Figure 12. Monthly Average Sump Pumping Rates vs. Long-term Average Precipitation ..........................25
Figure 13. Monthly Average Sump Pumping Rates vs. Long-term Average Flow Rates in Ralston Creek 26
Figure 14. Correlation Between Monthly Average Sump Pumping Rates, Precipitation, and Flow Rates in
Ralston Creek ............................................................................................................26
.................. 27
Figure 15. Conceptual Model of Groundwater Flow-Pre-Mining ......................................................••••••"28
Fi ure 16. Conceptual Model of Groundwater Flow-During Mining ........................................................
Figure 17. Conceptual Model of Groundwater Flow-Post-Mining ............................................................29
g
Figure 18. Groundwater Inflow to the Schwartzwalder Mine, 1973-1999 ...................................................30
Figure 19. Average Groundwater Inflow by Month, 1995-1999 ..................................................................31
Figure 20. Mine Recharge Capture Areas .....................................................................................................33
Figure 21. Observed Water Levels in the Schwartzwalder Mine During Refilling ......................................34
35
............
Figure 22. Rate of Water Level Rise During Mine Refil mg ............................................................
Figure 23. Volume of Mine Voids by Level .................................................................................................37
Figure 24. Void Volume vs. Inflow and Rate of Water Level Rise ..............................................................37
Figure 25. Average Level Elevation vs. Inflow and Rate of Water Level Rise ............................................37
.................. .
Figure 26. Stable Isotope Evaluation of Water Samples ................... • ••••••••••••••••••••••••••••••••••••••••42
Figure 27. Map of Radiometric Readings (counts per second) in the Vicinity of Ralston Creek (Young, 51
1985) .... ...........................................................................................................
....................... ...
Figure 28. Change in TDS, Sulfate, Specific Conductance, Alkalinity, and pH in with Location in Ra ston 4
................................................................
Creek, December 1998. ••••"""""""""' S
Figure 29. Seasonal Variation in TDS Components in Ralston Creek Water Downstream of
Schwartzwalder Mine ................................................................................................55
..................
Figure 30. Piper Diagram Showing Major Ion Composition of Ralston Creek Samples, 1997 - 2003
(Averaged by Station) ............................................................................................56
......................
Figure 31. Trends in Major Ion Concentrations at Station SW-BPL, 1998 - 2007 .......................................57
Figure 32. Correlation of Uranium, Sulfate, Bicarbonate, and TDS Concentrations at SW-BPL ................57
Figure 33. Trends in Uranium Concentrations at Stations SW-AWD, SW-A001, SW-BPL, SW-FBRG, 58
SW-ARH, and SW-LLHG ................. ........................................................................
...............
Figure 34. Uranium Concentrations in Ralston Creek at Upstream Stations SW-AWD and SW-A001, 1990
- 2007 .............................................................................................................. 59
............................
Figure 35. Uranium Concentrations in Ralston Creek at Downstream Stations SW-BPL and SW-FBR ,
1990 - 2007 ..............................................................................................................60
...................
Figure 36. Uranium Concentrations in Ralston Creek at Downstream Stations SW-ARH and SW-LLH ,
1990 - 2007 ...............................................................................................................61
................ .
Figure 37. Piper Diagram Showing Major Ion Composition of Groundwater Samples (Averaged by We .96
Figure 38. Uranium Concentrations in Alluvial Monitoring Wells Over Time ..........................................
................................................118
Figure 39. Uranium Concentrations in Sumps, 1990 - 2007 ..................... .
Figure 40. Piper Diagram Showing Major Ion Composition of Deep Mine Water Samples (Averaged by122
Location) .....................................................pp...............................p .......................
.................
Figure 41. Piper Diagram Showing Major Ion Composition of U er Mine Water Sam les ....................12
Figure 42. Piper Diagram Showing Major Ion Composition of Water in Reflooded Mine ........................128
Figure 43. Depth Profile for General Parameters in Flooded Mine Workings April 19, 2001 ...................131
Figure 44. Depth Profile for General Parameters in Flooded Mine Workings April 18, 2002 ...................132
Figure 45. Depth Profile for General Parameters in Flooded Mine Workings January 29, 2003 ...............133
Figure 46. Depth Profile for General Parameters in Upper 40 ft of Flooded Mine Workings, Nov 12, 2007134
Figure 47. Time Concentration Plots for General Parameters (pH, ORP, TDS) in Mine Water ................135
Figure 48. Time Concentration Plots for Major Anions (SOa, HCO3, and Cl) in Mine Water ...................136
Whetstone Associates
4109B.071116