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,%vEF,i a 12, i979 <br /> 0437 -102 <br /> Page -2- <br /> 2. HYDROLOGIC DATA <br /> - • a.) Precipitation Type II Storm <br /> (Design Storm) (24-hot.ir Rainfall) <br /> 100 Yr. 3.0" <br /> 25 Yr. 2.6" <br /> 10 Yr. 2•a' <br /> 5 Yr. 1.8" <br /> Tc = 15-minutes All Areas <br /> b.) Hydrologic Soil CcEDPlex Group - C Soils <br /> Silty Clays- <br /> Weathered Shales _ <br /> c.) Rimoff Curve Numbers <br /> Excavated Pad Area Surfaced with Waste <br /> Rack Fill 90 <br /> Excavated Pad Areas w/o Rack Fill 95 <br /> • Silty-Clays Barren Slope - 90 <br /> Silty-Clays Vegetated Slope 85 <br /> Mine Sub-Area Percent Areas Wei ted <br /> Excavate Vegetate C.N. <br /> Pad Slopes <br /> 3-1 . 100 0 90 <br /> 3-2 100 0 90 <br /> 4-1 100 - 95 <br /> 4-1A n/a 100 90 <br /> 4-2 100 - 95 <br /> 5-1 S0 50 90 <br /> 5-2 50 50 90 <br /> A-2 <br /> 55 <br />