2008-04-15_REVISION - M1980244 ‎(325)‎

• Permit No: M1980244
• IBM Index Class Name: REVISION
• Doc Date: 4/15/2008
• Doc Name: VOL II Appendix 2, Hydrologic Evaluation Report
• From: CC & V
• To: DRMS
• Type & Sequence: AM9
• Media Type: D
• Archive: No

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Contents
TABLES
Table 2.1 Climate summary for Victor, Colorado station (1966-1976) ........................... 6
Table 2.2 Historical precipitation data for the Cresson Mine Project site ........................ 6
Table 2.3 Statistical precipitation data ..................................................
.......................... 7
Table 2.4 Cresson Project average evaporation data ................................:....
Table 4.1 Flow rate measurements at GV-03 and estimated average monthly values . 25
Table 4.2 Monthly precipitation and snow data used in water balance model .............. 31
Table 4.3 Average monthly ET values used in the base case water balance ............... 32
Table 4.4 Areas used in water balance ........................................................................ 34
Table 4.5 Base case water balance flow results summary ........................................... 37
Table 4.6 ET values used in sensitivity analysis 1 ..........................................
Table 4.7 Sensitivity analyses results summar ~~~~~~~~~~~ 39
y ........................................................... 39
Table 4.8 ET values used in sensitivity analysis 2 ........................................................ 40
FIGURES
Figure 1-1 Site location map
Figure 1-2 ~ Mine features and stormwater management structures
Figure 3-1 Monitoring locations map
Figure 3-2 Piper plot showing water quality in the Cripple Creek drainage
Figure 3-3 Piper plot showing water quality in the Arequa Gulch
Figure 3-4 Piper plot showing surface water quality in the Wilson Creek
Figure 3-5 Piper plot showing groundwater quality in the Wilson Creek drainage
Figure 3-6 Piper plot showing surface water quality in the Squaw Gulch
Figure 3-7 Piper plot showing groundwater quality in the Squaw Gulch drainage
Figure 3-8 Piper plot showing groundwater quality in the Vindicator Valley drainage
Figure 3-9 Piper plot showing groundwater quality in the Gold Run Gulch drainage
Figure 4.1 Grassy Valley monitoring locations
Figure 4-2 Grassy Valley surface water flow measurements
Figure 4-3 Piper plots for GV01, GV02 AND GV03 surface water monitoring stations
Figure 4-4 Piper plots for GVMW 1 B, GVMW 2A, GVMW 2B, GVMW 36 and GVMW
5A wells
Figure 4-5 Piper plots for GVMW 4A, GVMW 7A AND GVMW 7B wells
Figure 4-6 Piper plots for GVMW 8A, GVMW 86, GVMW 10, AND MW 1A wells
Figure 4-7 Piper plots for CAM 1 A, CAM 1 B, COB 1 A AND COB 1 B wells
Figure 4.8 Conceptual model-current condition
Figure 4.9 Conceptual model-mining condition
Figure 4-10 Conceptual model-post mining condition
Figure 4.11 Base Case measured and simulated flow at GV-03
Figure 4.12 Measured pre-mining and simulated post-mining flow at GV-03
Figure 4.13 Measured pre-mining and simulated post-mining flow at GV-03
Sensitivity 1 & Sensitivity 2
Figure 4.14 Sensitivity 1-3, Post -mining
G/JO
Water Management Consultants
Cripple Creek & Victor Mining Company