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WCMW -6. Time series plots of selected parameters (pH, nitrate, and sulfate) are
<br />provided in Figure 4 -4.
<br />4.1.4.3 Discussion
<br />Ground water levels in WCMW -2, WCMW -3, and WCMW -6 vary from 24.42 to 48.18
<br />feet below measuring point ( "bmp "), 54.1 to 79.12 feet bmp, and 3.45 to 7.52 feet bmp,
<br />respectively. As shown in Figure 4 -3, the pressure transducer data for WCMW -2,
<br />WCMW -3, and WCMW -6 are limited to several months in 2011. The timing and
<br />magnitude of the water level peaks for the Wilson Creek monitor wells (shown in Figure
<br />4 -3 for the periods of record) appear to be related to the melting and infiltration of the
<br />snow in the spring months and the precipitation events in the summer and fall months. A
<br />comprehensive analysis of the horizontal and vertical ground water flow and ground
<br />water gradients in the Diatreme and the adjacent granites for the Cresson Project area,
<br />and specifically Grassy Valley is presented in "Cresson Project Hydrogeochemical
<br />Evaluation" dated February 2012 and prepared by ABC.
<br />Water quality conditions for WCMW -2, WCMW -3, and WCMW -6 are provided in
<br />Tables 4 -7, 4 -8, and 4 -9. Shallow alluvium (WCMW -2) ground water is characterized as
<br />calcium- sulfate water, similar to the surface waters. Shallow bedrock (WCMW -3) and
<br />deeper bedrock (WCMW -6) ground water are characterized as calcium - bicarbonate
<br />waters.
<br />Data in Tables 4 -7, 4 -8, and 4 -9 show median field pH values of 7.33 SU, 7.68 SU, and
<br />7.01 SU in WCMW -2, WCMW -3, and WCMW -6, respectively. Tables 4 -7, 4 -8, and 4 -9
<br />show median nitrate values of 5.02 mg/L as N, 0.08 mg /L as N, and <0.05 mg/L as N in
<br />WCMW -2, WCMW -3, and WCMW -6, respectively. Tables 4 -7, 4 -8, and 4 -9 show
<br />median sulfate values of 200 mg/L, 20.8 mg/L, and 53.3 mg/L in WCMW -2, WCMW -3,
<br />and WCMW -6, respectively. Time series plots of selected parameters (pH, nitrate, and
<br />sulfate) are provided in Figure 4 -4.
<br />Compiled data and statistics for aluminum, manganese, and zinc, which are common
<br />geochemical indicators in the Diatreme, are provided in Tables 4 -7, 4 -8, and 4 -9. The
<br />water quality data indicate low and relatively stable parameter concentrations for
<br />aluminum and zinc at WCMW -2, WCMW -3, and WCMW -6 since the mid- 1990s,
<br />respectively. Manganese concentrations also were low and relatively stable at WCMW -3
<br />and WCMW -6 over the period of record. Manganese concentrations at WCMW -2 were
<br />'Cripple Creek & Victor Gold Mining Company
<br />Cresson Project Hydrologic Evaluation for Mine Life Extension 2
<br />9
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