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• LS = length slope factor (from contour map & chart) <br />' C = management factor dependent upon vegetation & mulch <br />P = erosion control practice factor <br />SDL = sediment delivery ratio <br />Since all undisturbed areas have an identical land use (grazing <br />and wildlife habitat), the areas within each of the three sites <br />do not need to be split up into sub-areas. <br />Rainfall Factor "R" <br />The rainfall factor is the product of rainfall energy times the <br />maximum 30-minute intensity for a given rainstorm. It is <br />considered as the erosive power of the rain for that particular <br />area. A chart of "R" values for Colorado developed by the <br />Transportation Research Board in 1980 shows that the "R" value <br />for the entire Meeker area is 26. <br />Soil Erodibilitv Factor "K" <br />. This is a measure of the soil's susceptibility to erosion. It is <br />dependent upon the soil's resistance to detachment by rainfall <br />and by its ability to absorb water through infiltration. Exhibit <br />I-1 in the baseline soils section of the permit shows the soil <br />survey for the Northern #1 site and the refuse site. The Rienau <br />#2 site was previously disturbed by pre-law mining and no soil <br />was salvaged. However, the soil type adjacent to the site can be <br />used to determine the K factor for the soil prior to disturbance. <br />This is done using the Rio Blanco Soil Survey developed by the <br />Soil Conservation Service. The information extracted from Exhibit <br />I-1 and the Rio Blanco Survey is listed below: <br />Rienau #2 Site <br />Mapping Weighted <br />Soil Tvoe `.K of Area K factor Unit Slopes Avg. K <br />Mergel <br />Redthaye <br />Dollard <br />33.33 .20 51 8 to 65 <br />33.33 .28 51 8 to 65 <br />33.33 .37 51 8 to 65 <br />.0666 <br />.0933 <br />.1233 <br />_ .2832 <br />Weighted average K <br /> <br />M-~e <br />7~so/23 <br />