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GROUNDWATER RESIDENCE TIME AND RECHARGE TEMPERATURE ESTIMATES OF THE DENVER AND ARAPAHOE AQUIFERS, DENVER BASIN, COLORADO <br />Pearson, F. J., Jr., and W. W. Swarzenki, 1974, 14C evidence for <br />the origin of and region groundwater, Northeastern Province, <br />Kenya: Isotope techniques in ground water hydrology, p. 95- <br />108. <br />Phillips, F. M., 1995, The use of isotopes and environmental trac- <br />ers in subsurface hydrology: U.S. National Report to Interna- <br />tional Union of Geodesy and Geophysics 1991 -1994, p. <br />1029 -1033. <br />Phillips, F. M., M. K. Tansey, and L. A. Peters, 1989, An isotopic <br />investigation of groundwater in the Central San Juan Basin, <br />New Mexico: carbon 14 dating as a basis for numerical flow <br />modeling: Water Resources Research, v. 25, p. 2259 -2273. <br />Raynolds, R., 2004, Stratigraphy and water levels in the Arapahoe <br />aquifer, Douglas County area, Colorado: The Mountain Geolo- <br />gist, v. 41, no. 4. <br />Robertson, F. N., 1992, Radiocarbon dating of groundwater in a <br />confined aquifer in Southeast Arizona: Radiocarbon, v. 34, p. <br />664 -676. <br />Robson, S. G., 1987, Bedrock Aquifers in the Denver Basin, Col- <br />orado - A Quantitative Water - Resources Appraisal, Denver, <br />Colorado, USGS, p. 1 -73. <br />Sanford, W., 2002, Recharge and ground water models: an <br />overview: Hydrogeology Journal, v. 10, p. 110 -120. <br />Stute, M., and P. Schlosser, 2000, Atmospheric noble gases, in P. <br />Cook, and A. L. Herczeg, eds., Environmental tracers in sub- <br />surface hydrology: Boston, Kluwer Academic, p. 349 -377. <br />Stute, M., P. Schlosser, J. F. Clark, and W. S. Broecker, 1992, Pale - <br />otemperatures in the Southwestern United States derived from <br />noble gases in groundwater: Science, v. 256, p. 1000 -1003• <br />Vogel, J. C., 1970, Carbon -14 dating of groundwater: Isotope <br />Hydrology, p. 225 -237. <br />Woodard, L. L., W. E. Sanford, and R. G. Raynolds, 2002, Strati - <br />graphic variability of specific yield within bedrock aquifers of <br />the Denver Basin, Colorado: Rock Mountain Geology, v. 37, p. <br />229 -236. <br />Zhu, C., R. K. Waddell, Jr., I. Star, and M. Ostrander, 1998, <br />Responses of ground water in Black Mesa basin, northeastern <br />Arizona, to paleoclimatic changes during late Pleistocene and <br />Holocene: Geology, v. 26, p. 127 -130. <br />THE AUTHORS <br />MILos NOVOTNY <br />Milos M. Novotny is a Hydro <br />geologist at S.S. Papadopulos <br />and Associates, Inc. in Boulder, <br />s Colorado, where he works on <br />groundwater model develop - <br />ment and support, specifically <br />characterizing aquifer condi- <br />tions in the western U.S. His <br />research interests include Envi- <br />ronmental Tracer Hydrology <br />and Modeling of Natural Sys- <br />tems. He received his B.S. in <br />Geology from Indiana Univer- <br />sity and M.S. in Geology from Colorado State University. <br />WILLIAM SANFORD <br />William E. Sanford is a Hydro - <br />geologist and an Associate Pro- <br />fessor in the Department of <br />Geosciences at Colorado State <br />University, where he has been <br />since 1996. His research inter- <br />ests include Environmental and <br />Applied Tracer Hydrogeology <br />and Hydrogeology of Fractured <br />Aquifers. Prior experience <br />includes 4 years at Oak Ridge <br />National Laboratory in Ten- <br />nessee studying radionuclide transport in fractured mud - <br />stones. He received his Ph.D. in Soil and Water <br />Engineering and M.S. in Geophysics from Cornell Univer- <br />sity and B.S. in Geology from Beloit College. <br />167 The Rocky Mountain Association of Geologists <br />