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• Ground water data have been summarized for approximately 26 monitoring wells <br />in the Cresson Project area. The wells have been monitored on at least a quarterly <br />basis at most locations with some locations sampled more frequently. Following <br />is a discussion of the information from the ground water evaluation contained in <br />Appendix 2 and a summary of information derived from monitoring and other site <br />specific investigations. <br />Wilson Creek <br />There are three active monitoring wells completed in the granite in the Wilson <br />Creek watershed: WCMW-2, WCMW-3, and WCMW-6. There were nine other <br />wells that have been abandoned due to mine progress. The water levels are high <br />and vary seasonally. Two of the three wells are calcium bicarbonate wells, and the <br />WCWM-2 is a calcium chloride well. Data show average field pH values of 7.8, <br />7.3 and 7.7 in WCMW-2, WCMW-3, and WCMW-6, respectively. Data show <br />average nitrate values of 4.22 mg/l, 5.15 mg/l, and 0.08 mg/l in WCMW-2, <br />WCMW-3, and WCMW-6, respectively. Data show average sulfate values of 136 <br />mg/1, 203 mg/l, and 22 mg/1 in WCMW-2, WCMW-3, and WCMW-6, <br />respectively. <br />Vindicator Valley <br />Water quality was summarized for two wells in Vindicator Valley, VIN-2B, an <br />alluvial well, and VIN-2A, a shallow granite well. Data has been collected at <br />VIN-2B since May 4, 2004, and at VIN-2A since January 20, 2005. VIN-2A has <br />almost been totally dry since completion, and only field parameters have been <br />collected. Historic wells in the watershed, VIN-1A and VIN-1B were replaced by <br />VIN 2A and 2B. Overall, the ground water in Vindicator Valley is characterized <br />by calcium-sulfate dominated water with near neutral pH, nitrate values near the <br />detection limit and sulfate values which average 671 mg/L. <br />Arequa Gulch <br />There are three existing monitoring wells in the Arequa Gulch watershed: <br />ESPMW-1 and CRMW-3B are completed in the granite and CRMW-3A is <br />completed in the alluvium. Five other wells were monitored historically in Arequa <br />Gulch, but were abandoned when mining operations expanded. The CRMW wells <br />are both calcium sulfate waters, while the ESPMW-1 is a calcium bicarbonate <br />water. The ESPMW-1 well exhibits different characteristics from the CRMW-3B, <br />• but both wells exhibit normal water quality. The alluvial well has an average pH <br />Cripple Creek & Victor Gold Mining Company <br />Cresson Project Mine Life Extension <br />4-13