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 IV
• Table 8-1 . Springs, Reservoirs and Ditches Located within Two Miles of the Schwartzwalder Mine...... 8-1
Table 8-2. DWR-Registered Wells Located within Two Miles of the Schwartzwalder Mine ................. ... 8-2
Table 8-3. Flow Rates in Ralston Creek vs. Monthly Mean Precipitation at Ralston Reservoir ............. ... 8-4
Table 8-4. Completion Data for Alluvial Monitoring Wells .................................................................... ... 8-7
Table 8-5. Completion Data for Bedrock Monitoring Wells ................................................................... ... 8-7
Table 8-6. Summary of Single Well Permeability Tests in Alluvium ..................................................... . 8-12
Table 8-7. Summary of Multiple Well Permeability Tests in Alluvium .................................................. . 8-12
Table 8-8. Sump Pumping Rates .............................................................................................................. . 8-14
Table 8-9. Water Levels and Well Data for Bedrock Monitoring Wells MW 10 and MWI 1 ................. . 8-18
Table 8-10. Calculation of Vertical Gradients in Shallow Bedrock ......................................................... . 8-19
Table 8-11. Summary of Packer Permeability Test Results ..................................................................... . 8-20
Table 8-12. Average Monthly Inflow to the Mine from Precipitation Infiltration, 1995 - 1999 ............. . 8-23
Table 8-13. Average Rate of Water Level Rise in Mine Shaft ................................................................ . 8-28
Table 8-14. Mine Void Volumes and Observed Inflow Rates During Refilling ...................................... . 8-30
Table 8-15. Mine Flooding Benchmarks .................................................................................................. . 8-31
Table 8-16. Results of Ralston Creek Stream Survey, November 13, 2008 ............................................ . 8-44
Table 8-17. Ralston Creek Flow Measurement, November 13, 2008 ...................................................... . 8-45
Table 8-18. Ralston Creek Water Quality Survey Across Schwartz Trend, December 2009 .................. . 8-46
Table 9-1. Colorado Ground Water Standards for Inorganic Parameters, Coliform Bacteria, and
Radionuclides (') ................................................................................................................... ... 9-2
Table 9-2. Mixing Calculation to Determine Maximum Contribution of Mine Water to Alluvial Water
Quality .................................................................................................................................. ... 9-5
Table 9-3. Water Quality in the Alluvium ............................................................................................... ... 9-9
Table 9-4. Water Quality in the Sumps .................................................................................................... . 9-27
• Table 9-5. Uranium Concentrations (mg/L) in Sumps and Seep, Jan 1998 - March 2010 ...................... . 9-28
Table 9-6. Water Quality in the Domestic Well ............................................................... 9-31
Table 9-7. Water Quality in Shallow Bedrock ......................................................................................... . 9-33
Table 9-8. Water Quality Data for Flooded Mine Workings .................................................................... 9-36
Table 9-9. Flow Rates at Underground Sampling Stations in the Upper Mine Levels ............................. 9-48
Table 9-10. Water Quality Data for Seepage from the Upper Mine Levels .............................................. 9-51
Table 11-1. Discharge Permit Effluent Limitations ...................................................................................11-1
Table 11-2. Hardness Values Used in Calculating Hardness-Based Aquatic Standards ........................... 11-3
Table 11-3. Water Quality Standards for Ralston Creek Stream Segment 17b ........................................11-4
Table 11-4. Historical Monitoring Stations and Non-Routine Sampling Stations in Ralston Creek ........11-6
Table 11-5. Surface Water Quality Sampling Stations From the 1998-1999 Baseline Hydrology Study 11-7
Table 11-6. Comparison of Water Quality in Ralston Creek to Applicable Aquatic Standards ...............11-8
Table 11-7. Water Quality in Ralston Creek, 1998 - March 2010 .......................................................... 11-19
Table 11-8. Comparison of Water Quality with Location in Ralston Creek, November 1998 ............... 11-50
Table 11-9. Uranium Concentrations in Ralston Creek, January 1990 - March 2010 ............................ 11-51
Table 12-1. Active Surface Water Monitoring Stations ............................................................................12-2
Table 12-2. Active Groundwater Monitoring Stations ............................................................................ ..12-2
Table 12-3. Proposed Groundwater Monitoring Stations ........................................................................ ..12-2
Table 13-1. Monthly Climate Summary at Ralston Reservoir ................................................................ ..13-1
Table 13-2. Monthly Precipitation at Ralston Reservoir ......................................................................... ..13-2
Table 14-1. Summary of Geochemical Characterization Data for Waste Rock and Fill ........................ ..14-1
Table 14-2. Average Mineral and Chemical Analyses of Schwartzwalder Rocks .................................. ..14-2
Table 14-3. Summary of Acid-Base Accounting Results ....................................................................... ..14-3
Table 14-4. Average Water Quality for Samples Collected from Deep Mine Workings ........................ ..14-6
• Table 14-5. Weighted Average Water Quality for the Upper Mine Workings .......................................
Table 14-6. Controlling Mineral Phases in Deep Mine Water ................................................................ ..14-7
..14-8
4109C.100419 Whetstone Associates