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The Leadville Mill <br />3.8 REFERENCES <br />M1990-057 <br />EXHIBIT B — SITE DESCRIPTION <br />Page 3 -6 <br />Prior to closure, the Black Cloud mine was the highest producer of pumped <br />groundwater in Lake County. Today, groundwater provides water for Lake County <br />domestic uses. <br />Water quality in the upper Arkansas River basin alluvium is generally potable with a <br />few exceptions of elevated metals produced by effluent natural acid rock drainage <br />and septic system effluent contamination. (Groundwater Atlas of Colorado, 2003) <br />Apodaca, L.E., et al., 1996 Environmental Setting and implications on water quality <br />upper Colorado River Basin, Colorado and Utah: U.S. Geological Survey Water <br />Resources Investigation Report 95 -4263, 33p. <br />Lawrence, E, 1990, Hydrogeologic and geochemical processes affection the <br />distribution of radon and its parent radionuclides in ground water, Confider, <br />Colorado, Colorado School of Mines, M.S. thesis T 3923 (unpubl.), 181 p. <br />Topper, R, Karen Spray, William Bellis, Judith Hamilton, Peter Barkmann, 2003 <br />Groundwater Atlas of Colorado, Colorado Geological Survey and the Division of <br />Minerals and Geology, Department of Natural Resources, Denver, Colorado, 210 p. <br />Wallace, Alan, R., 1993, Geologic Setting of the Leadville Mining District, Lake County, <br />Colorado, Open File Report 93 -343, U.S. Geological Survey, Denver, Colorado, 22 p. <br />Version 1.0 April2013 <br />