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Spring 2008 Subsidence and Geologic Field Observations <br />Box Canyon, Apache Rocks, and South of Divide Mining Areas <br />• second photograph Freon Photographic Observation Paint 8A (Figure 8) shows a new, but <br />"nlaller, rockfall and associated landslide approximately 1,500 feet north of the larger <br />rockfall/landslidc area ahove mined Long wall Panel 21 (Location 5). <br />• Figure 8. Spring 2008 eastward view of the east side of Box Canyon showing a new, but smaller, active <br />rockfall/landslide area located approximately 1.500 feet north of the previously described rockfall/landslide area over <br />1_ongwall Panel 21 (right background). This event occurred sometime between September 2007 and June 2008. <br />The new rockfall/landslide site is over the mined Long all Panel 19 headgitte/Panel 20 taik-nitc <br />where 13-sewn ovCrhurdCn thickness is ;thout 2.200 feet. This site is referenced as Location 1) <br />alone 'traverse E-E' 00ap I ). The relatively small si/.e of the rockfall/landslidC is as noted on <br />Map 3. The rockfall source is the upper sandstone of the Ohio Creek MCnlher of the Mesaverde <br />Formation. <br />5.2 Traverse B-B' <br />Traverse 13-13' heoins at point A (of A-A) along Sylvester (11.11ch Road at the mouth of the first <br />Cast side canyon of Sylvester Gulch and continues southward up the newly completed roars to the <br />head of the vallCy whCIV it intercepts the main West Flatiron access road ahove mined Lon,_,wall <br />Panel 16 (approximately M) feet west of the area known as Ponds P27-2 and P27-3). <br />• 331-032.790 Wright Water Engineers, Inc. Page 18 <br />August 2008