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2. HYDROLOGIC DATA <br /> a. Type II Storm Frequency Precipitation <br /> 25 Yr/24 Hr 2.6 Inches <br /> 10 Yr/24 Hr 2.0 Inches <br /> Tc = 5 mins. All Areas <br /> b. Hydrologic Soil Complerx Group - C <br /> Silty gravelly clays <br /> Weathered Shale & Sandstone Outcrops <br /> Steep Slopes to 100% <br /> C. Runoff Curve Numbers (CN) <br /> Condition CN <br /> Excavated Pad Areas 90 <br /> Silty gravelly clays-on barren slope 90 <br /> Silty gravelly clays-on vegetated slope 85 <br /> or Excavated soils <br /> Mine <br /> Pad-Area CN <br /> '• Pad 1 100% Excavated in bedrock 90 <br /> t <br /> Pad 2 100% Excavated in bedrock 90 <br /> Pad 3 50% on bedrock-50% in soil 90 <br /> Pad 4 100% on excavated soils 90 <br /> Area CN <br /> 1 Natural Slope 85 <br /> 2 Natural Slope 85 <br /> 3 Natural Slope 85 <br /> k <br /> 36 <br />