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 11
• (iii).1 Depth to Water and Groundwater Flow ................................................. 8-18
(iii).2 Bedrock Permeability Tests ................................................................... 8-19
(iii).3 Mine Inflow During Operations ............................................................. 8-20
(iii).4 Mine Flooding After Operations ............................................................ 8-25
(c) Description of Geologic Media ........................................................................................ 8-32
(d) Identification of Fracture Systems ................................................................................... 8-32
(e) Hydrogeologic Conceptual Model ................................................................................... 8-36
(i) Hydrogeology of the Ralston Creek Alluvium and Fill ............................................. 8-36
(ii) Hydrogeology of the Mine and Unweathered Bedrock ............................................. 8-40
9. GROUNDWATER QUALITY ............................................................................................................. 9-1
(a) Existing and Potential Future Groundwater Uses .............................................................. 9-1
(b) Groundwater Quality Data ............................................................................................... .. 9-1
(i) Colorado Groundwater Quality Standards and Point of Compliance ........................ .. 9-1
(ii) Water Quality in Alluvium ........................................................................................ .. 9-3
(ii).1 Alluvial Monitoring Wells ..................................................................... .. 9-3
u 2 Sum Water Quality 9-26
(ii).3 Seep Water Quality ................................................................................ 9-26
(ii).4 Domestic Well Water Quality ................................................................ 9-30
(iii) Water Quality in Shallow Bedrock ............................................................................ 9-30
(iv) Water Quality in the Underground Mine ................................................................... 9-34
(iv).1 Evaluation of Changes in Mine Water Quality with Depth ................... 9-41
(iv).2 Evaluation of Chemical Trends in Mine Water as a Function of Time. 9-43
• (iv).3 Water Quality Data for Seepage into the Upper Mine Levels ............... 9-48
(c) Analytical Suite and Detection Limits ............................................................................. 9-51
10. SURFACE WATER CONTROL & CONTAINMENT FACILITIES ................................................10-1
11. SURFACE WATER QUALITY DATA ............................................................................................. 11-1
(a) Surface Water Quality Standards ..................................................................................... 11-1
(i) Discharge Permit Limits ............................................................................................ 11-1
(ii) Stream Standards .......................................................................................................11-2
(b) Surface Water Quality Data .............................................................................................11-5
(i) Previous Studies of Surface Water Quality ...............................................................11-5
(ii) Surface Water Sampling Locations ........................................................................... 11-5
(c) Ralston Creek Water Quality ........................................................................................... 11-7
(i) Water Quality During Operation of the Sumps and WTP ......................................... 11-8
(ii) Water Quality After Turning off the Sumps and WTP ..............................................11-9
(iii) Summary of Water Quality Impacts to Ralston Creek ............................................ 11-54
12. WATER QUALITY MONITORING PLAN ...................................................................................... 12-1
13. CLIMATE ............................................................................................................................................13-1
• 14. GEOCHEMICAL DATA AND ANALYSIS ......................................................................................14-1
(a) Geochemical Characterization of Waste Rock and Fill ...................................................14-1
4109C.100419 Whetstone Associates