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• TABLE 7-6e-3 <br />Seneca II Mine, Colorado <br />Sedimentation Pond Design - Soils Information <br />Soil Type Hydrologic "k" <br />or Area Soil Group factor <br /> <br />AW B 0.18 <br />2VF, 2VE, 2VD C 0.30 <br />X8F, X8E, X8D, X8C B 0.17 <br />l0E D 0.17 <br />35E D 0.22 <br />66E, 66D, 66C B 0.20 <br />99 B 0.16 <br />Reclaimed B 0.20 <br />Active Pit and Spoil 0.16 <br />Topsoil Removed 0.27 <br />Non Topsoiled Regraded Spoil 0.18 <br />• Source: Gary Wendt, Soil Scientist, Peabody Coal Company (Revised 1-26-87) <br />TABLE 7-6e-4 <br />Seneca Mine, Colorado <br />Weighted CN Calculations <br /> <br />Vegetation Cover Hydrologic <br />Soil Group <br />CN Area <br />(Acres) <br />CN_x Area <br />% Area <br />Mixed Brush/Aspen B 48 18.04 865.92 7.3 <br />Upland Sage B 51 3.3 168.30 1.3 <br />Topsoil Removed C 86 88.73 7,630.78 35.9 <br />Active Pit and Spoil - 85 29.0 2,465.0 11.7 <br />Newly Graded or Bare Ground - 86 45.07 3,876.02 18.2 <br />Reclaimed B 69 63.40 4,374.60 25.6 <br /> 247.54 19,380.62 100.0 <br />• <br />wt. CN = 19,380.62 = 78.29 Use 78 <br />2~4 .5~ <br />7-6e-5 <br />