2009-08-10_GENERAL DOCUMENTS - M1977300

• Permit No: M1977300
• IBM Index Class Name: GENERAL DOCUMENTS
• Doc Date: 8/10/2009
• Doc Name: EPP- SECTIONS 1 to Pg. 9-26
• From: Whetstone Associates/Cotter Corp.
• To: DRMS
• Permit Index Doc Type: Gen. Correspondence
• Email Name: DB2
• Media Type: D
• Archive: No

Environmental Protection Plan, Schwartzwalder Mine v
. 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
Figure 8-6. Sump Pumping Rates vs. Long-term Average Precipitation ................................................ .. 8-15
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 ........................................................................................ .. 8-28
Figure 8-15. Void Volume vs. Inflow and Rate of Water Level Rise ..................................................... .. 8-28
Figure 8-16. Average Level Elevation vs. Inflow and Rate of Water Level Rise ................................... .. 8-28
Figure 8-17. Generalized Geologic Map of Section 25 ........................................................................... .. 8-32
Figure 8-18. Geologic Map of a Portion of the Ralston Butte 7.5' Quad ............................................... .. 8-33
Figure 8-19. Map of Radiometric Readings in the Vicinity of Ralston Creek ........................................ .. 8-34
Figure 8-20. Flow Direction in Ralston Creek Alluvium ........................................................................ .. 8-36
Figure 8-21. Source of Base Flow to Ralston Creek and Ralston Creek Alluvium ................................ .. 8-37
Figure 8-22. Electrical Conductivity and pH Profile of Ralston Creek, November 13, 2008 ................. .. 8-39
Figure 9-1. Piper Diagram Showing Major Ion Composition of Groundwater Samples ........................ .... 9-4
Figure 9-2. Uranium Concentrations in Alluvial Monitoring Wells Over Time ..................................... .... 9-5
• Figure 9-3. Molybdenum Concentrations in Alluvial Monitoring Wells Over Time ............................. .... 9-6
Figure 9-4. Uranium Concentrations in Sumps, January 1998 - November 2008 .................................. .. 9-29
Figure 9-5. Piper Diagram Showing Major Ion Composition of Water in Flooded Mine ...................... .. 9-34
Figure 9-6. Depth Profiles for Temperature, pH, ORP, and E.C. in Mine Water, Nov 12, 2007 ........... .. 9-42
Figure 9-7. Time Concentration Plots for Solution Parameters (pH, ORP, TDS) in Mine Water .......... .. 9-44
Figure 9-8. Time Concentration Plots for Major Anions (HC03, SO4, and Cl) in Mine Water .............. .. 9-45
Figure 9-9. Time Concentration Plots for Major Cations (Ca, Mg, Na, K) in Mine Water .................... .. 9-46
Figure 9-10. Time Concentration Plots for Metals (Fe, Mn) in Mine Water .......................................... .. 9-47
Figure 9-11. Time Concentration Plots for Trace Metals (U, Mo) in Mine Water ................................... 9-48
Figure 9-12. Piper Diagram Showing Major Ion Composition of Seepage into the Upper Mine Levels . 9-50
Figure 11-1. Change in TDS, Sulfate, Specific Conductance, Alkalinity, and pH in with Location in
Ralston Creek, December 1998 ........................................................................................... 11-11
Figure 11-2. Seasonal Variation in TDS Components in Ralston Creek ................................................ 11-12
Figure 11-3. Piper Diagram Showing Major Ion Composition of Ralston Creek Samples .................... 11-13
Figure 11-4. Trends in Major Ion Concentrations at Station SW-BPL, 1998 - 2009 .............................. 11-14
Figure 11-5. Correlation of Uranium, Sulfate, Bicarbonate, and TDS Concentrations at SW-BPL....... 11-15
Figure 11-6. Trends in Uranium Concentrations at Stations SW-AWD, SW-A001, SW-BPL, SW-FBRG,
S W-ARH, and S W-LLHG ................................................................................................... 11-16
Figure 11-7. Uranium Concentrations in Ralston Creek at Upstream Stations SW-AWD and SW-A00 1,
1990 - Jan 2009 ................................................................................................................... 11-17
Figure 11-8. Uranium Concentrations in Ralston Creek at Downstream Stations SW-BPL and SW-FBRG,
1990 - Jan 2009 ................................................................................................................... 11-18
Figure 11-9. Uranium Concentrations in Ralston Creek at Downstream Stations SW-ARH and SW-LLHG,
1990 - Jan 2009 ................................................................................................................... 11-19
0 Figure 14-1. Comparison of TDS and Uranium Concentrations in Ralston Creek, Upstream and
Downstream of Waste Rock Dumps .....................................................................................14-4
4109C.090807 Whetstone Associates