2010-08-02_REVISION - M1977300 ‎(43)‎

• Permit No: M1977300
• IBM Index Class Name: REVISION
• Doc Date: 8/2/2010
• Doc Name: New Amend- EPP- Cover & Table of Contents
• From: Cotter Corp
• To: DRMS
• Type & Sequence: AM2
• Media Type: D
• Archive: No

Environmental Protection Plan, Schwartzwalder Mine IV
0 LIST OF TABLES
Table 1-1. Elevations of Upper Levels at the Schwartzwalder Mine .......................................................... 1-2
Table 7-1. Summary of Reclamation Activities .......................................................................................... 7-1
Table 7-2. Schwartzwalder Mine Void Volumes ........................................................................................ 7-3
Table 8-1 . Springs, Reservoirs and Ditches Located within Two Miles of the Schwartzwalder Mine...... 8-1
Table 8-2. D"-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 ...................................................................... 8-8
Table 8-6. Summary of Single Well Permeability Tests in Alluvium ...................................................... 8-13
Table 8-7. Summary of Multiple Well Permeability Tests in Alluvium ................................................... 8-13
Table 8-8. Sump Pumping Rates ............................................................................................................... 8-15
Table 8-9. Water Levels and Well Data for Bedrock Monitoring Wells MW 10 and MW11 .................. 8-19
Table 8-10. Calculation of Vertical Gradients in Shallow Bedrock .......................................................... 8-20
Table 8-11. Summary of Packer Permeability Test Results ...................................................................... 8-21
Table 8-12. Average Monthly Inflow to the Mine from Precipitation Infiltration, 1995 - 1999 .............. 8-24
Table 8-13. Average Rate of Water Level Rise in Mine Shaft ................................................................. 8-30
Table 8-14. Mine Void Volumes and Observed Inflow Rates During Refilling ....................................... 8-32
Table 8-15. Mine Flooding Benchmarks ................................................................................................... 8-34
Table 8-16. Results of Ralston Creek Stream Survey, November 13, 2008 ............................................. 8-46
Table 8-17. Ralston Creek Flow Measurement, November 13, 2008 ....................................................... 8-47
Table 8-18. Ralston Creek Water Quality Survey Across Schwartz Trend, December 2009 ................... 8-48
Table 9-1. Colorado Ground Water Standards for Inorganic Parameters, Coliform Bacteria, and
• Radionuclides (') ....................................................................................................................
Table 9-2. Mixing Calculation to Determine Maximum Contribution of Mine Water to Alluvial Water .. 9-2
Quality ................................................................................................................................... .. 9-5
Table 9-3. Water Quality in the Alluvium ................................................................................................ .. 9-9
Table 9-4. Water Quality in the Sumps ..................................................................................................... 9-31
Table 9-5. Uranium Concentrations (mg/L) in Sumps and Seep, Jan 1998 - March 2010 ....................... 9-32
Table 9-6. Water Quality in the Domestic Well ........................................................................................ 9-35
Table 9-7. Water Quality in Shallow Bedrock .......................................................................................... 9-37
Table 9-8. Water Quality Data for Flooded Mine Workings .................................................................... 9-40
Table 9-9. Flow Rates at Underground Sampling Stations in the Upper Mine Levels ............................. 9-50
Table 9-10. Water Quality Data for Seepage from the Upper Mine Levels .............................................. 9-52
Table 11-1. Existing Discharge Permit Effluent Limitations .................................................................... 11-1
Table 11-2. Proposed New Discharge Permit Effluent Limitations .......................................................... 11-3
Table 11-3. Hardness Values Used in Calculating Hardness-Based Aquatic Standards ........................... 11-5
Table 11-4. Water Quality Standards for Ralston Creek Stream Segment 17b ........................................ 11-6
Table 11-5. Surface Water Monitoring Stations ........................................................................................ 11-8
Table 11-6. Comparison of Water Quality in Ralston Creek to Aquatic Toxicity Standards .................1 1-10
Table 11-7. Water Quality in Ralston Creek, 1998 - June 2010 .............................................................1 1-21
Table 11-8. Comparison of Water Quality with Location in Ralston Creek, November 1998 ............... 1 1-51
Table 11-9. Uranium Concentrations in Ralston Creek, January 1990 - June 2010 ...............................1 1-52
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 .........................................................................
Table 14-4. Average Water Quality for Samples Collected from Deep Mine Workings .......................... 14-3
14-6
Table 14-5. Weighted Average Water Quality for the Upper Mine Workings .........................................14-7
4109C.100731 Whetstone Associates