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Spring 2009 Subsidence and Geologic Field Observations <br />Box Canyon, Apache Rocks, and South of Divide Mining Areas <br />• <br />Figure 20, Spring 2009 view of the sandstone outcrop on east side of West Flatiron <br />showing the same fractures and rockfall as observed in Fall 2008 (Figure 19). <br />• 5.5.3 Photographic Observation Point 1 <br />This location is at a single MDW site above mined Longwall Panel 20 that is used to observe and <br />photograph the slabbing rockfall and landslide area at Location 4. Figure 21 shows the <br />rockfall /landslide area west of Location 4 as observed in May 2009. A comparison to Figure 22 <br />(Fall 2007) shows there have been some changes along the cliff face, most notably in the <br />vegetation immediately above the vertical face. As noted in the discussion on Location 4, <br />continued headward erosion of this cliff face is actively occurring and will continue until new <br />equilibrium is established. <br />831- 032.791 Wright Water Engineers, Inc. Page 34 <br />November 2009 <br />