2012-02-28_REVISION - M1980244 (104)

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rock and migrates downward. Exploration drill holes and development wells drilled within the diatreme tend to be dry or have low yields. Present activities at the Cresson Project have not encountered significant ground water flow other than local perched aquifers that tend to contain limited amounts of water. Ground water monitoring shows that the depth to ground water beneath mine facilities is generally more than several hundred feet. As shown on Drawing G -1, no significant ground water production occurs in the area of the diatreme (i.e., ground water is not developed for use). The wells located within the diatreme as shown on Drawing G -1 are Cresson Project monitoring wells. The ground water system within the diatreme is distinct from that in areas surrounding the diatreme. Ground water data have been summarized for approximately 26 monitoring wells in the Cresson Project area. The wells have been monitored on at least a quarterly basis at most locations with some locations sampled more frequently. Following is a discussion of the information from the ground water evaluation contained in Appendix 2, Volume II and a summary of information derived from monitoring and other site specific investigations. Wilson Creek There are three active monitoring wells completed in the Wilson Creek watershed: WCMW -2 (alluvial), WCMW -3 (bedrock), and WCMW -6 (deeper bedrock). The water levels vary seasonally with WCMW -2 varying between 24.42 and 48.18 feet below the measuring point; WCMW -3 varying between 54.1 and 79.12 feet below the measuring point and WCMW -6 varying between 3.45 and 7.52 feet below the measuring point. Two of the three wells are calcium bicarbonate wells, whereas WCWM -2 is a calcium chloride well. Data show median field pH values of 7.33, 7.68 and 7.01 in WCMW -2, WCMW -3, and WCMW -6, respectively. Data show average nitrate values of 5.02 mg/L- N, 0.08 mg/L -N, and <0.05 mg/L -N in WCMW -2, WCMW -3, and WCMW -6, respectively. Data show average sulfate values of 200 mg /L, 20.8 mg/L, and 53.3 mg/L in WCMW -2, WCMW -3, and WCMW -6, respectively. Vindicator Valley Water quality was summarized for two wells in Vindicator Valley, VIN -2B, a shallow bedrock well, and VIN -2A, a deep bedrock well. Data have been collected at VIN -2B since May 4, 2004, and at VIN -2A since January 20, 2005. VIN -2A has shown water levels at or near the bottom of the well (approximately 245 feet below ground surface ( "bgs ") and only field parameters have been collected. VIN -2A has shown water levels Cripple Creek & Victor Gold Mining Company Cresson Project Mine Life Extension 2 4 -14