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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 26. Southward view from Photographic Observation Point 2 during spring 2009 of a <br />rockfalUlandslide area in a massive sandstone cliff of the Ohio Creek Member of the Mesaverde <br />Formation (i.e., Location 8). The area is located about 1,800 feet above the tailgate road pillars of <br />mined Longwell Panel 22. The excavated area above the rockfalitlandslide area (upper right) is <br />the drill pad for MDWs 22 -05 and 22 -06 (i.e., the terminus of Traverse H -H'). <br />• 5.7 Traverse G -G' <br />Traverse G -G' is a short traverse that begins along Traverse F -F' near the fork in the main West <br />Flatiron drill road and heads northwesterly to a drill pad containing MDW 18 -34. This Flat <br />traverse is above the eastern part and northern entries of mined LOngwall Panel 19 and primarily <br />is in clays and silts of the Wasatch Formation. Overburden depth to the B -seam is 2.,200 to 2,250 <br />feet. <br />No subsidence related features were observed along this traverse and no photographs were taken. <br />5.8 Traverse H -H' <br />Traverse H -H' begins at a fork in the main West Flatiron drill road and ends at the drill pad for <br />MDWs 22 -05 and 22 -06. This short traverse starts above the northern edge of mined Longwell <br />Panel 23 and ends above mined Longwall Panel 22. Soil, colluvium, and silty claystone, derived <br />primarily from the Wasatch Formation, were encountered. The overburden depth to the B -seam <br />• ranges from 2,200 to 2,250 feet. No subsidence features were observed along this route. <br />831- 032.791 Wright Water Engineers, Inc. Page 39 <br />November 2009 <br />