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and historic dumps/tailings, have enriched the shallow aquifer materials, and due to limited recharge,
<br /> these solutes remain elevated in the groundwater.
<br /> The sources of the elevated constituents in these four drainages existed well before 31 January 1994,
<br /> and the data presented in the present report show that mining/processing activities undertaken since
<br /> 1994 have not resulted in any new or increased sources of groundwater contamination. Therefore,
<br /> consistent with Regulation 41 the data collected after 1994 "shall be presumed to be representative of
<br /> existing quality as of January 31, 1994."
<br /> Groundwater in Wilson Creek and Grassy Valley does not appear to have been impacted by historic
<br /> mining and milling and, therefore, the data represent the natural background concentrations of the
<br /> constituents of interest.
<br /> 8. References
<br /> Campbell, M.R., 1922, Guidebook of the Western United States: Part E-The Denver& Rio Grande
<br /> Western Route, USGS Bulletin 707, 266 p.
<br /> CC&V, 2015, Cresson Project, Permit M-1980-244 Amendment 11 Application, dated 16 December 2015.
<br /> CC&V, 2016, Responses to Adequacy Review Comments, No. 2 Hydrology Section, Dated October 19,
<br /> 2016, M-1980-244/Amendment 11, dated December 8, 2016.
<br /> Cross, W., and Penrose, R.A.F. Jr., 1895, Geology and Mining Industries of the Cripple Creek District,
<br /> Colorado, Extract from the Sixteenth Annual Report of the Survey, 1894-95, Part II-Papers of an
<br /> Economic Character, U.S. Government Printing Office, 209 p.
<br /> Drake, R.L. and Grimstad, W.N., 1983, The Last Gold Rush: A Pictorial History of the Cripple Creek&
<br /> Victor Gold Mining District, Pollux Press, Victor, CO, 159 p.
<br /> EPA, 1992, 4.0 Site Visit Report: Nerco Minerals Cripple Creek, United States Environmental Protection
<br /> Agency, Office of Solid Waste, 94 p.
<br /> Feitz, L., 1978, Cripple Creek! A Quick History of the World's Greatest Gold Camp, thirteenth printing,
<br /> Little London Press, Colorado Springs, CO, 68 p.
<br /> Grimstad, B., and Drake, R.L., 1983, The Last Gold Rush A Pictorial History of the Cripple Creek&Victor
<br /> Gold Mining District, Pollux Press, Victor, Colorado, 159 p.
<br /> Henderson, C.W., 1926, Mining in Colorado: A History of Discovery, Development and Production,
<br /> USGS Professional Paper 138.
<br /> Henry, T.W., Evanoff, E., Grenard, D., Meyer, H.W., and Pontius, J.A., 1996, Geology of the Gold Belt
<br /> Back Country Byway, South-Central Colorado, Colorado Geological Survey Open-File Report 96-4,
<br /> Field Trip No. 24, 48 p.
<br /> Lakes, A., 1899, Visit to a Cyanide Mill, Mines and Minerals, v. XX, no.1, pp. 5-7, August 1899.
<br /> Lakes, A., 1901, Chlorination Mills, Mines and Minerals, v. XXL, no. 8, pp. 337-339, March 1901.
<br /> Levine, B.H., 1982, Lowell Thomas'Victor, The Man and the Town, Century One Press, 108 p.
<br /> Lindgren, W. and Ransome, F.L., 1906, Geology and Gold Deposits of the Cripple Creek District,
<br /> Colorado, USGS Professional Paper 54, 516 p.
<br /> Mining and Scientific Press, 1903, v. LXXXVI, no. 16, p. 253.
<br /> Woods, W., 1901, Gold Fields of Cripple Creek, Woods Investment Co., 91 p.
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