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• <br />u <br />• <br />4. Hydrologic Soil Type - Soil survey maps, as contained in Tab 9 <br />of the current Mine Plan, provides the basis of determining the <br />hydrologic soil type and the soil erodibility factor, "k" factor <br />(see Table 7-6e-3). <br />TABLE 7-6e-2 <br />SCS Curve Number <br />Seneca II Mine, Colorado <br />Vegetation Hydrologic <br />Cover Type Cover Conditions <br />RECLAIMED AREA (Herbaceous) <br />(Seeded grasses-contoured) <br />UNDISTURBED AREAS <br />Oak-Aspen: <br />(Mixed Brush-Aspen) <br />50-80% <br />30-70% <br />70-100% <br />fair to <br />good <br />fair <br />good <br />Sage-Grass: <br />(Upland Sagebrush) <br />30-70% <br />70-100% <br />fair <br />good <br />Hydrologic <br />Soil Type <br />B C D <br />69 78 83 <br />48 57 63 <br />30 51 48 <br />51 63 70 <br />35 47 55 <br />Pasture or Range <br />(Grassland used for 30-70% fair 69 79 84 <br />grazing) 70-100% good 61 74 80 <br />Herbaceous (Range) <br />(Grass/Weed/Low growing 30-70% fair 71 81 89 <br />brush) 70-100% good 62 74 85 <br />DISTURBED AREAS <br />Paved w/open ditches <br />(including right-of-way) 89 92 93 <br />Gravel Roads <br />(including right-of-way) 85 89 91 <br />Dirt Roads <br />(including right-of-way) 82 87 89 <br />Newly graded areas or <br />bare ground 86 91 94 <br />Sources: Revised SCS Technical Release No. 55. <br />Communications with the Colorado and Arizona SCS Hydrologis ts <br />(August 5, 1985). <br />7-6e-4 <br />