2010-04-20_REVISION - M1977300 ‎(2)‎

• Permit No: M1977300
• IBM Index Class Name: REVISION
• Doc Date: 4/20/2010
• Doc Name: Environmental Protection Plan ‎(EPP)‎ Adequacy Review #1
• From: Whetstone Associates
• To: DRMS
• Type & Sequence: TR11
• Media Type: D
• Archive: No

Environmental Protection Plan, Schwartzwalder Mine v
• Table 14-7. Controlling Mineral Phases in Flooded Mine Water ............................................................. 14-9
Table 14-8. Effect of pH and Eh on Controlling Mineral Phases ............................................................ 14-10
Table 15-1. Aquifer Properties for Preliminary PRB Design ....................................................................15-7
Table 17-1. Soils Types in Vicinity of the Schwartzwalder Mine and Ralston Creek ..............................17-2
LIST OF PLATES
Plate 1. Locations of Water Courses, Wells, Springs, Reservoirs and Ditches within Two Miles of the
Schwartzwalder Mine
LIST OF FIGURES
Figure 1-1. Cross Section Showing Mine Workings, Major Fault Systems, and Underground Water Sample
Locations ................................................................................................................................ . 1-3
Figure 2-1. Schwartzwalder Mine Location Map ....................................................................................... . 2-2
Figure 2-2. Locations of Chemicals and Facilities ..................................................................................... . 2-3
Figure 2-3. Gamma Survey of Site, Showing Radioactive Materials License (RML) Areas ..................... 2-4
Figure 8-1. Average Flow Rates in Ralston Creek vs. Monthly Mean Precipitation .................................. 8-5
Figure 8-2. Denver Water's Moffatt Collection System ............................................................................. 8-6
Figure 8-3. Monitoring Well and Sump Locations ..................................................................................... 8-8
Figure 8-4. Locations of Springs Mapped by USGS within Two Miles of the Schwartzwalder Mine..... 8-10
_ Figure 8-5. Sump Pumping Rates, 1995 - 2002 ........................................................................................ 8-15
15
8
Figure 8-6. Sump Pumping Rates vs. Long-term Average Precipitation .................................................. -
Figure 8-7. Sump Pumping Rates vs. Long-term Average Flow Rates in Ralston Creek ......................... 8-16
Figure 8-8. Correlation Between Sump Pumping, Precipitation, and Flow Rates in Ralston Creek ........ 8-17
Figure 8-9. Groundwater Inflow to the Schwartzwalder Mine, 1973-1999 .............................................. 8-21
Figure 8-10. Average Groundwater Inflow by Month, 1995-1999 ........................................................... 8-22
Figure 8-11. Mine Recharge Capture Areas .............................................................................................. 8-24
Figure 8-12. Observed Water Levels in the Schwartzwalder Mine During Refilling ............................... 8-25
Figure 8-13. Rate of Water Level Rise During Mine Refilling ................................................................. 8-26
Figure 8-14. Volume of Mine Voids by Level .......................................................................................... 8-29
Figure 8-15. Void Volume vs. Inflow and Rate of Water Level Rise ....................................................... 8-29
Figure 8-16. Average Level Elevation vs. Inflow and Rate of Water Level Rise ..................................... 8-29
Figure 8-17. Generalized Geologic Map of Section 25 ............................................................................. 8-34
Figure 8-18. Geologic Map of a Portion of the Ralston Butte 7.5' Quad ................................................. 8-35
Figure 8-19. Map of Radiometric Readings in the Vicinity of Ralston Creek .......................................... 8-36
Figure 8-20. Flow Direction in Ralston Creek Alluvium .......................................................................... 8-38
Figure 8-21. Source of Base Flow to Ralston Creek and Ralston Creek Alluvium .................................. 8-39
Figure 8-22. Electrical Conductivity and pH Profile of Ralston Creek, November 13, 2008 ................... 8-42
Figure 8-23. Geologic Map Showing Electrical Conductivity Survey in Ralston Creek, November 13, 20088-43
Figure 8-24. December 2009 Gamma Survey Across Schwartz Trend .................................................... 8-45
Figure 8-25. Ralston Creek Water Quality Survey Results Across Schwartz Trend, December 2009..... 8-47
Figure 9-1. Piper Diagram Showing Major Ion Composition of Groundwater Samples .......................... .. 9-6
Figure 9-2. Uranium Concentrations in Alluvial Monitoring Wells Over Time ....................................... .. 9-7
Figure 9-3. Molybdenum Concentrations in Alluvial Monitoring Wells Over Time ............................... .. 9-8
. Figure 9-4. Uranium Concentrations in Sumps, January 1998 - March 2010 .......................................... 9-29
Figure 9-5. Piper Diagram Showing Major Ion Composition of Water in Flooded Mine ........................ 9-35
4109C.100419 Whetstone Associates