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REFERENCES <br /> Colton, E. B., 1978,Geologic map of the Boulder—Fort Collins--Greeley area,Colorado: U. S. <br /> Geological Survey Miscellaneous Investigations Map 1-855-G, scale 1:100,000. <br /> Harr, M. E., 1962. "Groundwater and Seepage", McGraw Hill, New York. pp 1 19-121. <br /> Hem,J.D., 1992. Study and Interpretation of the Chemical Characteristics of Natural Water. <br /> U.S.Geological Survey Water-Supply Paper: 2254 <br /> NAS. 1977. National Academy of Sciences. Drinking Water and Health. Washington, DC: <br /> National Academy Press. pp 279-285. <br /> Schneider,P.A., 1983, Shallow groundwater in the Boulder—Fort Collins—Greeley area, <br /> Colorado, 1975-77: U.S. Geological Survey Water Resources Investigation Report 83- <br /> 4058. <br /> EPA 1999. Report to Congress: Wastes from the Combustion of Fossil Fuels, Volume 2 — <br /> Methods, Findings, and Recommendations. EPA/530-R-99-010. Office of Solid Waste <br /> and Emergency Response. March. <br /> U.S. Geological Survey (USGS). 1997. Radioactive Elements in Coal and Fly Ash: Abundance, <br /> Forms, and Environmental Significance. U.S. Geological Survey Fact Sheet FS-163-97. <br /> October. <br />