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Fall 2007 Subsidence and Geologic Field Observ<~tions <br />Canyon, Apache Rocks, and South of Divide Minim Areas <br />point farther west and north of the 2006 and 2007 vantage point. Ohservations from other <br />directions suggest that there has heen little change over the past two years. Other apparent <br />changes appear to be the result of seasonal differences (i.e., no leaves on the aspen trees, snow, <br />etc.) as opposed to additional rocktallilandslide occurrences. <br />• <br />5.4.3 Location 7 (also D' and Photographic Observation Point 2) <br />The fresh cracks that were observed near the southwest corner of drill pad MDWs 19-04 and 19- <br />0~ at D' of traverse D-D' in the spring 2007 field visit were much less visible during the fall field <br />visit (Figure 19). It is possible that a partial explanation for the apparent healing of this crack is <br />re-grading of the pad surface. This site is located over the central portion of the east end of <br />longwall panel 19 which was mined through in the spring 2006. The overburden depth to the B- <br />ream at this location is approximately 2,20 feet. <br />r1 <br />~J <br />831-032.780 Wright Water Engineers, Inc. Page 31 <br />November 2007 <br />Figure 18. Southward view from D' during 2007 of a rockfalUlandslide area in a massive sandstone cliff of the Ohio <br />Creek Member of the Mesaverde Formation. The area is located about 1,800 feet above the tailgate road pillars of <br />mined lonywall panel 22. The excavated area above the rockfall/landslide area (upper right) is MDW 22-05. <br />