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Slope Evaluation and Remediation <br />West Elk Mine <br />Somerset, Colorado <br />inches per day or feet per year, presumably when wetted or as surcharge pressures <br />build. The goal of this project is to attempt to define the limits of the recent landslide as <br />well as provide recommendations regarding stabilization of the slope in this area. <br />SITE CONDITIONS <br />The site exists as an active <br />subsurface coal mine at the time of <br />our subsurface exploration. The <br />recent landslide feature is active <br />within a buried gully that we <br />understand was in- filled by the mine.. - <br />The observed vegetation on the site - <br />generally consisted of native <br />grasses, weeds, and brush <br />extending beyond the disturbed <br />areas. The site was bordered by an unpaved haul / access road and coal storage pile to <br />the south and west, conveyor belts and operation buildings to the east, and State <br />Highway 133 to the north. The site was sloping down to the north at gradients of <br />approximately 50 percent (2(H) : 1(V)). The elevation difference across landslide feature <br />was approximately 30 to 40 feet. <br />SUBSURFACE EXPLORATION <br />The subsurface exploration for the <br />project was conducted on September <br />5, 2011. Five (5) test holes were <br />drilled within or above the recent <br />landslide feature. Test holes were <br />drilled using a track mounted drill rig <br />to depths of approximately 15 to 40 <br />feet below the existing grades to <br />evaluate subsurface conditions, as <br />well as to retrieve samples for <br />laboratory testing and analysis. <br />-- -,: <br />�. <br />s <br />Job No. 11 -6014 GROUND Engineering Consultants, Inc. Page 2 <br />