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Formation. The Summerville Formation provides an additional barrier preventing the <br />constituents of concern from impacting the groundwater in the underlying Entrada <br />Sandstone. <br />In summary, mining operations at the SM -18 pose no significant threat to <br />groundwater resources in the area. <br />References <br />ACRi, 2000, PORFLOW Users Manual, Version 4.0, Rev. 4, Bel Air, California. <br />Blumb, A. C., C. L. Murphy, and L. G. Everett, 1992, "A Comparison of Three Functional Forms <br />for Representing Soil Moisture Characteristics," Ground Water, Vol. 30, No. 2, pp. 175- <br />185. <br />Freeze, R.A., and J.A. Cherry, 1979. Groundwater. Prentice Hall, Inc. New Jersey. <br />14 <br />SM -18 Mine Report <br />GeoScience Services <br />Lohman, S.W., 1965. Geology and Artesian Water Supply Grand Junction Area Colorado. <br />Geological Survey Proffesional Paper 451, Washington, D.C. <br />McKay, E.J., 1955. Geologic Map of the Atkinson Creek Quadrangle, Colorado. U.S. <br />Geological Survey Map GQ 57, Washington D.C. <br />Sheppard, M. I., and D. H. Thibault, 1990. Default Soil Solid/Liquid Partition Coefficients, K <br />for Four Major Soil Types: A Compendium. Health Physics, Vol. 59, pp. 471 -482. <br />Van Genuchten, R., 1978, Calculating the Unsaturated Hydraulic Conductivity with a New <br />Closed -Form Analytical Model, Princeton University, Rpt. 78- WR -08, Department of Civil <br />Engineering, Princeton, New Jersey. <br />