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Post -Mine Conditions <br />Irrigated Pasture - 2008 Cover Data <br />The vegetation data is from the report Western Fuels Colorado, LLC New Horizon <br />Mine - 2008 Vegetation Sampling for Phase 2 Bond Release Irrigated Pasture Site. <br />0.4% Noxious Weeds <br />0.3% Annual Forbs <br />26.4% Perennial Grasses <br />45.7% Perennial Forbs <br />15.9% Litter <br />Ground Cover (cover that contacts the surface) = Annual forbs + Perennial Grasses + <br />Perennial Forbs + Litter + Noxious Weeds <br />Ground Cover = 88.7% <br />Canopy Cover = None <br />Canopy Cover = 0% <br />Using Table 5 and a canopy of 0% and the "G" canopy type, the C factor can be <br />calculated. An interpolation is required to determine the value for 88.7% ground cover: <br />AC <br />88.7 -80 <br />x -0.013 <br />8.7 <br />= AC <br />95 -80 <br />= 0.003 -0.013 <br />15 <br />x ,, 0.007 <br />Therefore, the best "C" value for the post -mine irrigated pasture is 0.007. <br />SL -14 03DEC12.wpd 36 <br />Summary of "C" Factors <br />Pre -Mine Irrigated Pasture <br />0.003 <br />Post -Mine Irrigated Pasture <br />0.007 <br />Post -Mine Conditions <br />Irrigated Pasture - 2008 Cover Data <br />The vegetation data is from the report Western Fuels Colorado, LLC New Horizon <br />Mine - 2008 Vegetation Sampling for Phase 2 Bond Release Irrigated Pasture Site. <br />0.4% Noxious Weeds <br />0.3% Annual Forbs <br />26.4% Perennial Grasses <br />45.7% Perennial Forbs <br />15.9% Litter <br />Ground Cover (cover that contacts the surface) = Annual forbs + Perennial Grasses + <br />Perennial Forbs + Litter + Noxious Weeds <br />Ground Cover = 88.7% <br />Canopy Cover = None <br />Canopy Cover = 0% <br />Using Table 5 and a canopy of 0% and the "G" canopy type, the C factor can be <br />calculated. An interpolation is required to determine the value for 88.7% ground cover: <br />AC <br />88.7 -80 <br />x -0.013 <br />8.7 <br />= AC <br />95 -80 <br />= 0.003 -0.013 <br />15 <br />x ,, 0.007 <br />Therefore, the best "C" value for the post -mine irrigated pasture is 0.007. <br />SL -14 03DEC12.wpd 36 <br />