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• TABLE 2 <br />(Continued) <br />Soil Type Hydrologic Erodibility (k) <br />or Area (2) Soil Grouo(3) Factor(4) <br />703 B 0.23 <br />5103 <br />B D.27 <br />Topsoil Removed B 0.24 <br />Spoil Piles/Graded Spoil 8 0.16 <br />Reclaimed/TOpsoiled B 0.32 <br />1 <br />Includes YESCO (1979) baseline soil survey data for Seneca II-V and PCC (7983-7988) topsoil <br />and spoil sampling data from representative reclamation sites et Seneca II Mine. <br />2 <br />As identified on Exhibit 9-7, Soil Types end Topsoil Salvage Map. <br />3 <br />Determined by utilizing Soil Conservation Service (SC S, 7981) Soil Interpretation Procedural <br />Guidelines for preparing S[S-SOILS-5 forms and map unit composition information listed in <br />Tab 9, Appendix 9-4, Table 9-4-3. <br />4 <br />Surface soil horizon k values were calculated by utilizing the USDA-ARS revised LISLE software <br />• program. The k values were adjusted for volumetric rock fragments, whenever necessary, <br />according to Table 603-5 (SCS, 7983 - National Soils Handbook). The map unit k factors are <br />based upon composition percentage information listed in Tab 9, Appendix 9-4, Table 9-4-3. <br />Particle Size Distributions. The particle size distribution is based on sieve and <br />hydrometer analysi6 of various soil types in the proposed permit area. The distribution <br />is an average of the soil types in the mine area. <br />The specific gravity of the soil end the submerged bulk specific gravity were estimated <br />based on various soil types. Specific gravity end submerged bulk specific gravity were <br />estimated to be 2.50 and 1.25, respectively. <br />R-Factor. The R-factor for the Seneca II-w Mine area was determined to be 30. <br />Length-Slope Factor (L.SI. The length-slope is described as the typical length-slope for <br />the subwatershed and the distance from the point of origin of overland flow until the <br /> point that the slope decreases such that significant deposition occurs, or until the flow <br />. enters a defined channel. Following is McKool et ala s (1987) L,S equation: <br />13-1-7 Revised 04/24/91 <br />