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In contrast to the valley-fill deposits in the mine area, the terrace deposits to the north and <br />south are characterized as Pierre Shale and Pierre Shale transition materials (interbedded <br />shale and hard ridge-forming sandstones) overlain by a thin layer of sand and red clay <br />fan/pediment deposits (Hershey & Schneider, 1972; and Shelton & Rogers, 1987 - see <br />excerpts in Appendix Q. As a whole, strata of the Pierre Shale and transition zones <br />exhibit low vertical hydraulic conductivities, and zones of higher horizontal permeability <br />are limited. <br />EnviroGroup Limited 3