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Ib/ft3. Second is a colluvial soil along the upper portions of the road and the mine site <br />that is the result of landslides from strata above the road. This soil is a highly cohesive <br />clay, 1,300 PSF; with a relatively low angle of internal friction, 15° ; and a higher density <br />of 130 I b/ft3. <br />During construction of the existing road, the soil in the areas to be cut was used <br />to fill the drainages to create the road and mixing the soils. During reclamation of the <br />mine road, the blended soils were excavated from the drainages and placed in the fill <br />sections, again mixing the soil types. The engineering characteristics of the blended soil <br />are not identical to the two "pure" soils. These calculations assume that the dominant <br />soil in each area will have the highest influence upon the strength of the reclamation <br />backfill; therefore, the characteristics of the dominant soil in each area are generally <br />used for the stability calculations. The exception is in the upper portion of the road <br />where the dominant soil is very high in cohesion and could give an elevated factor of <br />safety. For stability analysis of these areas, backfill with a soil of lower cohesion was <br />used in the calculations to introduce an additional factor of safety into the analysis. <br />The steepest slope along the road ali nment is at the first hill u from the existin <br />9 P 9 <br />second gate, Station 18+00. Cross sections of this area; as well as, two other areas on <br />the upper portion of the road, Stations 42+00 and 47+00 are shown on Figure 3.1-8. <br />The stability analysis was performed using a program developed at the <br />University of Kentucky called REAME. The program allows the user to create a data set <br />to define the soil horizons and rock layers. The soil parameters, conditions of failure <br />and trial centers are defined. REAME then calculates the lowest factor of safety for the <br />data set, working from the trial center to the location of the lowest factor of safety .The <br />reports generated by REAME were edited to fit on one page each and are contained in <br />Table 3.9-4. <br /> <br />TR-23 3-9 12/07 <br />