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Fall 2008 Subsidence and Geologic Field Observations <br />Box Canyon, Apache Rocks, and South of Divide Mining Areas <br />is <br />• <br />J <br />Figure 13. Sandstone outcrop on east side of West Flatiron showing fractures and rockfall where <br />cracks, previously noted at Location 4, intercept the rock face. The historically observed crack <br />trend from Location 4 is generally from the white pickup truck (background) toward the rockfall <br />(foreground). The sandstone cliff at this location is approximately 40-50 feet thick. <br />5.5.3 Photographic Observation Point 1 <br />This location is at a single NIMV site above mined Long?vall Panel 20 that is used to observe and <br />Photograph the slabbing rockfall and landslide area at Location 4. f=igure 14 sho\ s the <br />rockfall/landslide area west of Location 4 as observed in October 2008. A comparison to Figure <br />1_5 (fall 2007) shows there to be some nexv slabbing and rockfall activity. It is likely that this <br />process will continue until equilibrium is established. <br />831-032.790 Wright Water Engineers, Inc. Page 29 <br />December 2008