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• TABLE 3 <br />Sedimentation Pond Design - Soils Information <br />Nucla Mine, Colorado <br />Soil Type Hydrologic "k" <br />or Area Soil Group Factor <br />18/F-2 D 0.14 <br />5810/26-1 B 0.17 <br />5810/7C-2 B 0.17 <br />5810E/D-2 B 0.17 <br />5810I/3B-2 B 0.17 <br />5810I/7C-1 B 0.17 <br />9904/D-1,2 D 0.22 <br />9904/F-2 D 0.22 <br />Reclaimed C 0.25 <br />Active Pit + Spoil Piles C 0.21 <br />Non-topsoiled Regraded Spoil C 0.23 <br />• Topsoil Removed D 0.32 <br />Soil information included for Technical Revision (existing pits) and <br />Permit Revision (scraper pits). Source: Gary Wendt, Soil Scientist, <br />Peabody Coal Company (September 15, 1986). <br />SEDIMENTOLOGY <br />The SEDIMOT II computer program was also utilized to calculate the <br />sedimentology of each watershed using the modified universal soil loss <br />equation (MUSLE). Using 87 lbs/cubic foot, 0.42 acre-feet (801.4-tons) <br />will be deposited in this sediment pond as the result of a 10-year, <br />24-hour storm. The following paragraphs describe the sources of data <br />used as input for the MUSLE calculations. <br />Soil Erodibility Factors (K) <br />Tab 9 of the current Nucla Mine Plan contains the results of the Soil <br />• Resources Survey. These results indicate that the soils in the area <br />have soil erodibility factors in the range of 0.14 to 0.32. In an <br />6 <br />