PERMFILE50960

• Permit No: C1982057A
• IBM Index Class Name: Permit File
• Doc Date: 12/5/2005
• Section_Exhibit Name: Tab 17 Probable Hydrologic Consequences
• Media Type: D
• Archive: Yes

LIST OF TABLES
IContinuedl
Table No. Page
17-19 Values Used and Calculated for Seneca II-W Spoil, Hubberson Gulch,
Watering Trough Gulch, Sage Creek, and Dry Creek Mean Flows and
TDS Levels 50
17-20 Same Day Field Parameter Measurements Taken Along Dry Creek
on October 12, 1990 52
17-21 Premining and Postmining Geomorphic Parameters of Basins
to be Affected by Mining 55
17-22 Pre- and Postmining Drainage Channel Parameters 57
17-23 Subwatersheds and Corresponding Areas and Junctions Used
for Developing SEDIMOT II Input Parameters for Premining Conditions 64
17-24 Subwatersheds and Corresponding Areas and Junctions Used
for Developing SEDIMOT II Input Parameters for Postmining Conditions 65
17-25 Peak Discharge, Runoff Volume, Peak Sediment Concentration
and Sediment Yield Calculated Using SEDIMOT II for the
005 and 006 Gulch Watersheds 68
17-26 SEDIMOT II Input Parameters Used for Modeling Pre- and
Postmining Conditions in the 005 Gulch Basin 70
17-27 SEDIMOT II Input Parameters Used for Modeling Pre- and
Postmining Conditions in the 006 Gulch Basin 72
17-28 Comparison of Same Day Discharge Measurements Conducted
at Site SG1 (006 Gulch) and Site FG1 (Hubberson Gulch) 75
17-29 Summary of Probable Hydrologic Consequences of the
Life-of-Mine Mining Plans for the Seneca II-W Mine II-W South Area 78
17-30 Summary of Aquifer Characteristics 88
17-31 Annual Pit Inflow Volumes for Wadge Overburden and
Coal Ground Water Systems 90
17-31A Annual Pit Inflow Volumes for Sage Creek and Wolf Creek Overburden
and Coal Ground Water Systems 91
17-32 Pit Pumpage Rates and Estimated Drawdown Distances for
Seneca II-W South Area Overburden and Coal Ground Water Systems 94
17-33 Acid Base Potential of Overburden Cores 101
17-34 Summary of Seneca II-W and Seneca II-W South Overburden
Core Paste pH Values 102
17-35 Summary of Particle Size Disbributions of Seneca II-W and
Seneca II-W South Core Samples 104
iv Revised 1/02