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Spring 2009 Subsidence and Geologic Field Observations <br />Box Canyon, Apache Rocks, and South of Divide Mining Areas <br />• 5.1.2 Photographic Observation Point 8 <br />This point (also A' of Traverse A -A') provides a good view of the active slabbing and <br />rockfall /landslide areas on the east side of Box. Canyon (west flank of West Flatiron). These <br />include the largest rockfall/landsiide are above Longwall Panel 21 (Location 4 of this report) and <br />a smaller rockfall/landslide area above entries between Longwall Panels 19 and 20 (Location 7 of <br />this report). Both locations we shown in Figure 7. <br />• <br />Figure 7. Spring 2009 photograph of the rockfall /landslide area at Location 7 (small slide in left <br />central portion of the figure at the horizon line) and Location 4 (larger slide In right central portion <br />of the figure at the horizon line). <br />A comparison of Location 4 photographs taken from Photographic Observation Point 8 (Figures <br />8 and 9) shows there to be relatively little observable change, except for the reduced number of <br />pine trees on the horizon over the exposed cliff facea demonstration that continued slabbing <br />and headward erosion is occurring. Further discussion about Location 4 can be found in Section <br />5.5.1 of this report. <br />is <br />831 - 032.791 Wright Water Engineers , Inc. <br />November2009 <br />