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
• (i) Whole Rock Analysis ................................................................................................14-1
u Acid-Base Accounting 14-2
(iii) Acid Consumption Tests ............................................................................................14-3
(iv) Impact Analysis .........................................................................................................14-3
(b) Geochemical Characterization of Mine Refill Water ....................................................... 14-4
(i) Modeling Approach ................................................................................................... 14-5
(ii) Mass Balance Mixing Model ..................................................................................... 14-5
(iii) Evaluation of Precipitation and Dissolution Reactions Controlling Mine Water
Chemistry ............................................................................................................14-7
15. MITIGATION OPTIONS AND CONSTRUCTION SCHEDULE ....................................................15-1
(a) Description of Source .......................................................................................................15-2
(i) Source of Chemical Loading .....................................................................................15-2
(ii) Thickness and Extent of Alluvium ............................................................................ 15-2
(iii) Potential Pathways for Alluvial Groundwater ........................................................... 15-2
(iv) Affect of Alluvial Water Quality on Ralston Creek ..................................................15-3
(b) Description of Mitigation Options ................................................................................... 15-3
(i) Strategically Designed and Constructed Wetlands ....................................................15-3
(ii) Permeable Reactive Barrier (PRB) ............................................................................15-6
(iii) Source Removal ....................................................................................................... 15-10
(c) Monitoring Well Installation .......................................................................................... 15-10
(d) Schedule for Engineering Design, Construction, and Mitigation ................................... 15-12
• 16. QUALITY ASSURANCE AND QUALITY CONTROL ................................................................... 16-1
17. PLANT GROWTH MEDIUM (SOILS) ..............................................................................................17-1
18. WILDLIFE PROTECTION .................................................................................................................18-1
(a) Mitigation Measures to Prevent Loss of Habitat ..............................................................18-1
(b) Measures to Prevent Wildlife Contact ............................................................................. 18-1
19. TAILINGS AND SLUDGE DISPOSAL ............................................................................................19-1
20. REFERENCES .................................................................................................................................... 20-1
LIST OF APPENDICES
Appendix A Monitoring Well Logs
Appendix B Water Quality Data Base
Appendix C Geochemical Model
LIST OF TABLES
Table 1-l. 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
4109C.100419 Whetstone Associates