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Table E-1 <br /> Surface Hydrology Characterization <br /> Gold Basin Mine <br /> Cache Creek,Chaffee County,Colorado <br /> General Cache Creek Drainage Characteristics Figure E-la Cache Creek Drainage <br /> Delineation <br /> Hydrologic Soil Unit-Bross Soil Series- Group B (SCS, 1975) <br /> Group B Soils with moderate infiltration rates when thoroughly wetted. These consist chiefly of <br /> soils that are moderately deep to deep,moderately well drained to well drained with moderately <br /> fine to moderately course textures. These soils have a moderate rate of water transmission(final <br /> infiltration rate of 0.15 to 0.30 inch). (Wilkes et al. 1975) <br /> Bross Soil Series Curve Number=60 (Wilkes et al, 1975) (SCS, 1975) <br /> 60%Grass Cover Density <br /> Hydrologic Soil GroUp_=B (SCS, 1975) <br /> Design Storm (U.S. Department of Commerce, 1961) <br /> 2, year-24 hour storm event-- 1.5 inches; <br /> 5 year-24 hour storm event=2.0 inches; <br /> 10 year-24 hour storm event—2.6 inches; <br /> 25 year-24 hour storm event 3.0 inches; <br /> 100 year-24 hour storm event=4.2 inches <br /> Steep Slopes within the study area are greater than 8 %and above <br /> aA <br /> r-q <br /> December 28,2014 <br /> Colorado Division of Reclamation Mining and Safety <br /> Gold Basin Mine,Inc. <br /> Gold Basin Mine <br /> Granite,Colorado <br />