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• Using the maximum constituent concentrations in C-Pit water observed to date rather
<br />than an average. Use of the maximum C-Pit constituent concentrations will likely
<br />overestimate the concentration of constitutents released to the Dakota sandstone; and
<br />• Assuming that none of the solutes are attenuated. Some of the constituents, selenium
<br />and thallium, are known to sorb to aquifer materials during transport. Sorption of
<br />these constituents to clay minerals or iron and manganese oxyhydroxides in the
<br />underlying shales would reduce the concentration of some of the constituents
<br />released to the Dakota sandstone.
<br />6 References
<br />Banks and Gesso, LLC. and Grant Environmental, Inc., 1999, Report on Storage of Cement Kiln
<br />Dust, Southdown, Inc. Lyons Plant, Southdown, Inc., Lyons Quarry, Permit No. M-77-208, June.
<br />Fox Consultants, Inc., 1985, Report on Geotechnical Feasibility and Preliminary Embankment
<br />Design Proposed Dowe Flats Dam and Reservoir Near Lyons, Colorado, January.
<br />Gelhar, L., A. Mantoglou, C. Weltz, and K. Rehfeldt, 1985, A Review of Field Scale Physical
<br />Solute Transport Processes in Saturated and Unsaturated Porous Media, Electric Power Research
<br />Institute Report EA-4190, 116 pp.
<br />Kasenow, M, 2001, Applied Groundwater Hydrology and Well Hydraulics, 2nd Edition, Water
<br />Resources Publications, LLC, Highlands Ranch, Colorado, 835 pp.
<br />Madole, R. F., W. A. Braddock, and R. B. Colton, 1998, Geologic Map of [he Hygiene
<br />Quadrangle, Boulder County, Colorado, U. S. Geological Survey Geologic Quadrangle Map GQ-
<br />1772.
<br />Monson Kundsen Corporation, 1993, Mining Assessment Report, Dowe Flats Project, Lyons,
<br />Colorado, Febmary.
<br />Rocky Mountain Consultants, Inc., 1988, Water Storage and Water Quality Evaluation, Lyons
<br />Quarry Pits "A" and "C," Prepared for Southwestern Portland Cement Company, January.
<br />Tetra Tech, Inc., 1989, MYGRT Code Version 2.0: An IBM Code for Simulating Migration of
<br />Organic and Inorganic Chemicals in Groundwater, Electric Power Research Institute Fina] Report
<br />EN-6531, October.
<br />October 29, 2004 7 Revision 0
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