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 ii
• (i).3 Sump Pumping ....................................................................................... 8-13
ii Colluvium and Weathered Bedrock ........................................................................... 8-18
(iii)Low-Permeabilty Bedrock ......................................................................................... 8-18
(iii).1 Depth to Water and Groundwater Flow ................................................. 8-19
(iii).2 Bedrock Permeability Tests ................................................................... 8-20
(iii).3 Mine Inflow During Operations ............................................................. 8-21
(iii).4 Mine Flooding After Operations ............................................................ 8-27
(c) Description of Geologic Media ........................................................................................ 8-34
(d) Identification of Fracture Systems ................................................................................... 8-35
(e) Hydrogeologic Conceptual Model ................................................................................... 8-38
(i) Hydrogeology of the Ralston Creek Alluvium and Fill ............................................. 8-38
(ii) Hydrogeology of the Mine and Unweathered Bedrock ............................................. 8-42
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 9-30
(ii).3 Seep Water Quality ................................................................................ 9-30
(ii).4 Domestic Well Water Quality 9-34
• (iii) Water Quality in Shallow Bedrock ............................................................................ 9-34
(iv) Water Quality in the Underground Mine ................................................................... 9-38
(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 ............... 9-50
(c) Analytical Suite and Detection Limits ............................................................................. 9-52
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 .......................................................................................................11-3
(b) Surface Water Quality Data ............................................................................................. 11-7
(i) Previous Studies of Surface Water Quality ...............................................................11-7
(ii) Surface Water Sampling Locations ...........................................................................11-7
(c) Ralston Creek Water Quality ........................................................................................... 11-9
(i) Water Quality During Operation of the Sumps and WTP .......................................11-10
(ii) Water Quality After Turning off the Sumps and WTP ............................................11-11
(iii) Summary of Water Quality Impacts to Ralston Creek ............................................11-55
12. WATER QUALITY MONITORING PLAN ......................................................................................12-1
• 13. CLIMATE ............................................................................................................................................13-1
4109C.100731 Whetstone Associates