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APPENDIX 2.05.3-1 <br />• HAUL ROAD STABILIZATION & GEOTECHNICAL ANALYSIS <br />SUMMARY REPORT <br />SUN COAL COMPANY - MEADOWS N0. 1 <br />ROUTT COUNTY, COLORADO <br />The entire haul road was inspected for indications of mass instability on <br />June 20, 1983. The proposed haul road stabilization program recommended herein <br />is to address potential problems noted. <br />The inspection revealed no indications of major, deep-seated instability in <br />either cuts or fills along the entire haul road alignment. Only one area of <br />shallow-seated sloughing of road fill outslopes was noted; this problem can be <br />best stabilized by regrading and drainage control on the road surface. <br />Between Culverts 7 and 8 on the following Figure 1, the steep (estimated <br />• 1.3:1) fill slopes have undergone local surface sloughing. Failures on the fill <br />surface show evidence of "flow"-type behavior under the influence of seepage and <br />saturation. The failure areas are limited in lateral extent and limited in <br />depth to one to two feet. Also in evidence are tension cracks on the surface <br />and the inslope side of the oversteepened safety berm fill, as shown on <br />Figure 2. The outslope ditch shows signs of having carried most, if not all, <br />runoff flows. <br />Observations suggest that the sloughing failures have been precipitated by <br />a combination of two conditions: <br />1. Oversteepened slopes of the safety berm fill (estimated 1:1). <br />2. Heavy, concentrated flow in the outslope ditch, giving rise to seepage <br />through the safety berm fill and resulting surface saturation of the <br />haul road fill outslopes. <br />• <br />- 200 - (Rev. 5/86) <br />