2012-02-28_REVISION - M1980244 ‎(95)‎

• Permit No: M1980244
• IBM Index Class Name: REVISION
• Doc Date: 2/28/2012
• Doc Name: VOL. 2, Appendix 2: Hydrologic Evaluation Part 1
• From: CRIPPLE CREEK & VICTOR GOLD MINING COMPANY
• To: DRMS
• Type & Sequence: AM10
• Email Name: TC1
• Media Type: D
• Archive: No

level measurements. Time series plots of selected parameters (pH, nitrate, and sulfate)
for GRMW -1A, GRMW -2A, and GRMW -3A are provided in Figure 5 -6.
5.3.4.3 Discussion
Ground water levels in GRMW -1A, GRMW -2A, and GRMW -3A are shown on Figure 5-
6. The ground water levels in GRMW -1A, GRMW -2A, and GRMW -3A vary from 144
to 149.34 feet bmp, 54.1 to 76.98 feet bmp, and 139.21 to 158.78 feet bmp, respectively.
The hand measured data for GRMW -2A show 0 -2 water level peaks per year. The timing
and magnitude of the peaks for the shallow monitor well is likely related to the melting
and infiltration of the snow in the spring months and the precipitation events in the
summer and fall months. The hand level measurements for the deeper monitor wells
GRMW -1A and GRMW -3A show relatively stable water level conditions. A
comprehensive analysis of the horizontal and vertical ground water flow and ground
water gradients in the Diatreme and the adjacent granites for the Cresson Project area,
and specifically Grassy Valley is presented in "Cresson Project Hydrogeochemical
Evaluation" dated February 2012 and prepared by ABC.
Field and water quality conditions for GRMW -1A, GRMW -2A, and GRMW -3A are
provided in Tables 5 -9, 5 -10, and 5 -11. Time series plots for pH, nitrate, and sulfate are
provided in Figure 5 -7. Shallow bedrock and deeper bedrock ground waters in Gold Run
drainage at GRMW -1A and GRMW -2A are characterized as calcium- sulfate waters.
Deeper bedrock ground water at GRMW -3A is characterized as calcium- bicarbonate
waters. Data in Tables 5 -9, 5 -10, and 5 -11 show median pH values of 6.84 SU, 7.01 SU,
and 7.41 SU for GRMW -1A, GRMW -2A, and GRMW -3A, respectively. Median nitrate
values were <0.05 mg/L as N for all three monitor wells. Median sulfate values were 691
mg/L, 1726 mg/L, and 184 mg/L for GRMW -1A, GRMW -2A, and GRMW -3A,
respectively. Figure 5 -7 shows relatively stable conditions for all three parameters.
Compiled data and statistics for aluminum, manganese, and zinc, which are common
geochemical indicators in the Diatreme, are provided in Tables 5 -9, 5 -10, and 5 -11. The
water quality data indicate relatively stable and low concentrations for aluminum,
manganese, and zinc at GRMW -1A and GRMW -3A from 1998 -2001 and in 2011. The
water quality data indicate relatively stable and low concentrations for aluminum and
zinc and stable and elevated concentrations of manganese at GRMW -2A from 1998 -2004
and in 2011. Other trace metals are analyzed as part of the monitoring program. Median
values for arsenic (except GRMW -1A), cadmium, chromium, copper, lead, mercury,
'Cripple Creek & Victor Gold Mining Company
Cresson Project Hydrologic Evaluation for Mine Life Extension 2
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