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2.2 SOIL ERODIBILITY FACTOR, K <br />The soil erodibility factors for the Colowyo Mine were estimated based on soil survey information presented <br />in the Colowyo Permit Application. <br />~~ - - ~ TABLE 2 - ~~ - <br />SOIL ERODIBILITY FACTOR ~ ~ ~ _, <br />DOMINANT SOIL TYPE SOIL TEXTURE SOIL ERODIBILITY <br />FACTOR IK) <br />Campspass Series Loam 0.24 <br />Burnette Series Loam 0.28 <br />Work Series Loam 0.31 <br />Average 0.28 <br />2.3 LENGTH-SLOPE FACTOR, LS <br />Input parameters to deterrtrine the LS factor were obtained from scaled maps of the watershed areas. Values <br />measared from the scaled maps are shown in the SEDCAD4 printouts. <br />2.4 CONTROL FACTOR, C <br />The control factor is used to account for vegetative or mulch cover. The following values were utilized in <br />the pond design evaluations (Renard et al, 1996) (Schwab and Wamer, 198'7): <br />-TABLE 3 <br />' - ~ CONTROL FACTOR - ~ ~ ~ ~ ~ - <br />COVER COVER TYPE VEGETATION CONTROL FACTOR <br />Undisturbed Mountain Shrub 75% canopy (0.5 m fall heightl, 0.080 <br /> 40% ground cover <br /> Oak-Aspen 50% canopy 12.0 m fall heightl, 0.085 <br /> 40% ground cover <br /> Sagebrush (good) 75% canopy 10.5 m fall hetllhtl, 0.031 <br /> 60% ground cover <br /> Sagebrush Ifair) 50% canopy (0.5 m fall heightl, 0.070 <br /> 40% ground cover <br />Disturbed Topsoil Stripped No appreciable canopy or cover 1.000 <br />Reclaimed Topsoiled and No appreciable canopy or cover O.S00 <br /> Seeded <br /> 1 to 2 Year Rangeland/Continuous Grass, no 0.070 <br /> Growth appreciable canopy, 70% cover <br /> 3+ Year Growth Rangeland/Continuous Grass, no 0.010 <br /> appreciable canopy, 80% cover <br />Exhibit 7 4 Revision Dale 10/23/03 <br />Revision No. TR-56 <br />