PERMFILE113883

• Permit No: C1980007
• IBM Index Class Name: Permit File
• Doc Date: 2/2/1999
• Section_Exhibit Name: Exhibit 18 Characterization of Groundwater Sytems in the Vicinity of the WEM
• Media Type: D
• Archive: No

Mayo and Assotlales, LC
•
LIST OF FIGURES
•
•
I Location map of the West Elk Mine and vicinity ............................................................. .....2
2 Palmer Hydrologic Droftght Index for Colorado Region 2 ............................................... ...10
3 Stratigraphic colutnn of bedrock units in the vicinity of the West Elk Mine ................... ...12
4 Geologic map of [he West Elk Mine area ......................................................................... ...15
5 Geologic cross-sections of the West Elk Mine area ......................................................... ...16
6 Box plots of TDS of surface waters and groundwaters .................................................... ...34
7 Scatter plot of mean solute compositions of surface waters and groundwaters ................ ...38
8 Stable isotopic composition of surface waters and groundwaters .................................... ...53
9 Cumulative discharge of spring groups ............................................................................ ...57
10 Box plots of minimum and maximum spring discharge rates ........................................ ...59
11 Selected spring hydrographs ........................................................................................... ...60
12 Selected well hydrographs .............................................................................................. ...70
13 Map of existing and proposed mine workings and in-mine water sampling locations... ...78
14 Conceptual model offault-related groundwater systems in the Rollins Sandstone........ ...83
15 Conceptual model of active and inactive groundwater flow regimes ............................. ...86
LIST OF TABLES
la Summary of current well monitoring plan ...........................................................................3
16 Summary of current spring monitoring plan ........................................................................4
2 Mean solute compositions of streams, wells, and springs ...................................................27
3 Mean values of solute compositions of streams, wells, and springs ....................................35
4 Summary of two-tailed t-test for TDS and stable isotopes ..................................................40
5 Isotopic compositions of surface and groundwater ..............................................................46
6 Summary of analyses of well hydrographs ..........................................................................72
Characterization ofGroundwater Systems in the Vicinity of the West Elk Mine. Somerset. Colorado
29 January 1999