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REFERENCES <br />EnviroGroup Limited, 2007. "Phase I Environmental Site Assessment Report, Parsons <br />Mine Site, Colorado ", prepared for Lafarge North America, August 2007. <br />McDonald, M.G., and A.W. Harbaugh, 1988. "A Modular Three-Dimensional Finite- <br />Difference Ground-Water Flow Model," Book 6, Chapter Al, Techniques of Water- <br />Resources Investigations of the United States Geological Survey. <br />Lafarge West, Inc. - Parsons Mine 9 <br />Groundwater Monitoring and Mitigation Plan