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NovcrLer 12, 9 <br /> 0437-102 <br /> Page -4- <br /> 4. SEDD= YIII TES <br /> a.) Soil Yield Determined by Universal Soil Loss Equation <br /> A = FMS CP Ref. SCS Tech Notes 50Arzma l <br /> Sub Area all Soil Length Control Sediment Losses <br /> Erodability Slope Practice Factor <br /> R K IS CP A <br /> (see 'b') Tons/Acre AF/Acre* <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 /> 5-2 40 .35 7.0 L 98.00 0.064 <br /> • * conversion based can 70 pcf <br /> b.) Soil Erodability Factor K <br /> Soils within Coal Creek Basin are predominantly within <br /> Hydrologic Soil Coumlex - Group C . Observed soil conditions as follows: <br /> Pad Area <br /> FOO <br /> �* { Slopes <br /> 1) % gravelly to stoney rock fragments 0- 30-50 30-50 <br /> 2) % clay silt fine sand 0-20 30-40 30-40 <br /> 3) % sand 0-20 20-30 20-30 <br /> 4) % organic matter 0 1 1 <br /> 5) soil structure 4 1 1-2 <br /> 6) permeability 6 � 4 3-4 { <br /> 7) Result - estimated soil erodability <br /> factor K <br /> k Pad Areas for Tines 3 & 4 Excavatedinto weathered bedrock, <br /> sandstone and shale. <br /> Pad Area for 111.Lne 5 partially excavated but is mostly on fi 11 <br /> or an gravelly silty soils. <br /> A-4 <br /> 57 <br />