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2004 Geologic Hazard Field Observations <br />South of Divide Mining Area <br />8.1.3 Aerial Photo Observations of Rockfalls in the Minnesota Reservoir Area. <br />The steep, horseshoe-shaped scarp of bedrock, which is located east of the mouth of Horse <br />Creek and northeast of Minnesota Reservoir, is one of the steepest scarps in the South of <br />Divide mining area. The slope ranges from about 55 to 60 percent, and therefore has an <br />estimated moderate to high rockfall potential. Although the rockfall potential is moderate to <br />high, the risk to travelers on the Dry Fork road is low to non- existent, because the rocks <br />would miss the road and fall harmlessly into Dry Fork. <br />The steep slope located west of the Minnesota Reservoir and dam exhibit the same <br />percentage slope as the one to the northeast (about 55 to 60 percent), suggesting that the <br />estimated rockfall potential is moderate to high. The reddish color of this slope is from the <br />burning of coal seams. The risk to people is also low to nonexistent because this steep slope <br />area is remote from roads. Also, as currently planned, this area will not be mined. <br />. 8.2 Field Location 2 <br />This observation point is located at the lower cow camp on the northeast side of the Dry Fork of <br />Minnesota Creek road (Figure 6). <br />The lower cow camp is located above projected, un-mined longwall pane] E2. The <br />overburden depth to the E Seam is about 800 feet (Figure 6), <br /> <br />831-032.621 Wright Water Engineers, Inc. Page 25 <br />November 2004 <br />