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PERMFILE64980
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PERMFILE64980
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Last modified
8/24/2016 11:10:52 PM
Creation date
11/20/2007 8:39:05 PM
Metadata
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Template:
DRMS Permit Index
Permit No
C1981020A
IBM Index Class Name
Permit File
Doc Date
5/13/2002
Section_Exhibit Name
3.0 RECLAMATION PLAN
Media Type
D
Archive
Yes
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3-25 <br />MINE ROAD STABILITY ANALYSIS <br />• To ensure that the reclamation of the mine site and road will be stable, analysis of stability <br />was performed on three areas on the road and two on the mine site. These calculations indicate <br />that the reclaimed slopes will be stable. The locations of these cross sections are shown on <br />Figures 3.1.2 through 3.1-7. These sections generally duplicate the location of stability analysis <br />performed in 1982 in response to questions by the Division about future haul road construction. <br />In conjunction with the previous stability analysis, detailed geologic mapping of the area and <br />triaxial tests were performed to determine the engineering characteristics of the soil types <br />existing along the road. Some areas not analyzed previously where added because the existing <br />configuration does not include the large cuts anticipated for the previous submittal. <br />The mapping and analysis revealed that two soil types exist along the road. First is soil of <br />alluvial origin that is high in gravel and sand content and exists along the lower portions of the <br />road on the points that Geo-Hydro identified as "river terraces." The soil has low cohesion, 200 <br />PSF; a high angle of intemal friction, 28° , and a density of 125 Ib/ft3. Second is a colluvial soil <br />along the upper portions of the road and the mine site that is the result of landslides from strata <br />• above the road. This soil is a highly cohesive clay, 1,300 PSF; with a relatively low angle of <br />intemal friction, 15° ; and a higher density of 130 Ib/ft3. <br />During construction of the existing road, the soil in the areas to be cut was used to fill the <br />drainages to create the road and mixing the soils. During reclamation of the mine road the <br />blended soils will be excavated from the drainages and placed in the fill sections, again mixing <br />the soil types. The engineering characteristics of the blended soil will not be identical to the two <br />"pure" soils. These calculations assume that the dominant soil in each area will have the <br />highest influence upon the strength of the reclamation backfill; therefore, the characteristics of <br />the dominant soil in each area are generally used for the stability calculations. The exception is <br />in the upper portion of the road where the dominant soil is very high in cohesion and could give <br />an elevated factor of safety. For stability analysis of these areas, backfill with a soil of lower <br />cohesion is used in the calculations to introduce an additional factor of safety into the analysis. <br />The steepest slope along the road alignment is at the first hill up from the existing second <br />gate, Station 18+00. Across section of this area; as well as, two other areas on the upper <br />• portion of the road, Stations 42+00 and 47+00 are shown on Figure 3.1-8. <br />M~ Volume I 12 - 18 - 96 <br />
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