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<br />Cripple Creek & Victor Gold Mining Company Exhibit U <br />Cresson Project Amendment 13 <br /> 12 <br />8 GROUNDWATER INFORMATION <br />Information on regional groundwater, including identification of tributary water courses, wells, <br />springs, stock water ponds, reservoirs, and ditches within two miles of the affected lands <br />boundary, are shown on Figure G-1 provided in Exhibit G and they are discussed in Exhibit G. <br />The discussion addresses the regional groundwater system and the transport of groundwater <br />from the area. The regional geology is shown on Drawing C-7 provided in Exhibit C. The igneous <br />lithology in the area consists predominantly of phonolite, lapilli breccia, and granodiorite. Much of <br />the breccia is cemented by a dolomitic carbonate, which, with small pyrite crystals, has replaced <br />the original mineral fragments and impregnated the other minerals. The volcanic diatreme is <br />lineated with faults, fractures, veins, joint structures, and underground workings, which have been <br />drained by tunnels built between 1903 and 1941 to decrease water levels within the Cripple Creek <br />Mining District (District). The regional groundwater system is intersected by the Carlton Tunnel, <br />which conveys that regional groundwater six miles to the southwest, to its outlet near the <br />confluence of Fourmile Creek and Cripple Creek. An evaluation of the current effects of project <br />activities on was provided in Amendment 11 documentation (December 2015). The average <br />regional groundwater flow from the District has not increased due to current mining and no <br />increase is anticipated to occur due to proposed Amendment 13 activities. <br />8.1 Groundwater Quality Data <br />Groundwater quality data are discussed in Exhibit G and supporting data are provided in Appendix <br />6 of this Amendment 13 permit. Figures G-1 and G-2 (Exhibit G) show groundwater wells, surface <br />water bodies and springs filed with the Office of the State Engineer within a two-mile radius of the <br />affected lands boundary. Groundwater monitoring information includes at least five successive <br />calendar quarters of data for existing wells, which have been summarized for approximately 23 <br />monitoring wells in the Cresson Project area, excluding Grassy Valley. Another 27 wells have <br />been installed and monitored in Grassy Valley to provide overall water quality. As noted in Exhibit <br />G, deep-diatreme groundwater is not developed for use in this area and is not anticipated to be <br />developed for use in the future considering the overall lack of groundwater.