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1979 <br /> C437-102 <br /> Page -4- <br /> 4 SE DI IMF'v7 7=S <br /> a. ) Soil Yield Determined by Uli versal Soil Loss Equation <br /> A = K,,'-T.4 CP Ref. SCS Tech Notes 50 <br /> Arxn:al <br /> Sub Area Rainfall Soil Length Control SedLment Lcsses <br /> Erodabil.ity Slope Practice Factor <br /> R. K LS CP A <br /> (see 'b') Tons/Acre ?s�JAc:re* <br /> 3-1 40 .35 3.10 1 43.40 0.028 <br /> 3-2 _ 40 .35 5.00 1 70.00 0.046 <br /> 4-1 40 .35 0.42 1 2.47 0.002 <br /> 4-1A 40 .65 ' 11.00 1 286.00 0.188 <br /> 4-2 40 .35 0.23 1 3.22 0.002 <br /> 5-1 40 .35 1.90 1 26.60 0.017 <br /> i <br /> 5-2 40 .35 7.0 L 98.00 0.064 <br /> * Conversion based on 70 pcf <br /> b.) Soil Erodabil-ity Factor K <br /> Soils within Coal Creek Basin are predmLnantly within <br /> Hydrologic Soil Comiex - Group C . Observed soil conditions as follows: <br /> _ Pad Area <br /> 17�, - Slopes <br /> 1) % gravelly to stoney rock fragments 0- 0 , 30-5 30-50 <br /> 2) o clay silt fine sand 0-20 30-40 30-40 <br /> 3) % sand 0-20 20-30 20-30 <br /> 4) 7. organic matter 0 1 <br /> 5) soil structure 4 ! 1 1-2 <br /> 6) permeability 6 4 3-4 <br /> , <br /> 7) Result - estimated soil erodability <br /> factor K <br /> * Pad Areas for Mines 3 & 4 Excava.ted :Lnto . earhered bedrock, <br /> sancstoie n:�d shale. <br /> Pad Area .or :`.4-ne 5 y e��cap:aged nLt is vastly or, fili <br /> or or, gravelly silty soils. <br /> A-4 <br /> 57 <br />