Laserfiche WebLink
<br /> <br />The geologic and soil field study program was conducted and supervised <br />by a soils engineer from Dames & Moore. Soil samples were obtained from the <br />bore holes, and were classified by visual and textural examination in the field. <br />A complete log was maintained of each bore hole, and these classifications <br />were supplemented by inspection in the Dames & Moore Laboratory. A graphical <br />representation of the soils encountered in these bare holes is shown on <br />Figure 2.1-1 through 2.1-5, Log of Bore Holes. The nomenclature used to <br />describe the soil types appears on Figure 2.1-6, Unified Soil Classification <br />System. The depth at which groundwater was encountered is also indicated on <br />each log. <br />2.2 Hydrology <br />2.2.1 Groundwater Hydrology <br />• The only known aquifers near the ore sorter are the Quaternary Alluvium <br />and the Idaho Springs formation. <br />The Idaho Springs formation bears the characteristics of a fractured <br />bedrock aquifer. Generally the hydrogeology of fractured bedrock is complex <br />and highly variable over short distances; however, within a few thou<,and feet <br />around the ore sorter, the lithology of the country rock is uniform ass are the <br />closely spaced zones of northwest trending faulting and attendant cross <br />fracturing. Because of this uniformity, it is assumed that the Idahc Springs <br />formation in the vicinity of the ore sorter is characterized by homogenous <br />water storing and transmissive properties. <br />Walton (1970), Romero (1970) and Morrison and Allen (1972) acknowledge <br />that the permeability of fractured bedrock varies widely, but that a permeability <br />• of 0.1 to 10 gallons per day per square foot (0.0002 to 0.002 ft.lday) is <br />