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Spring 2008 Subsidence and Geologic Field Observations <br />Box Canyon, Apache Rocks, and South of Divide Mining Areas <br />• <br />• <br />of the large sandstone rockfall along the south side of North Fork can be readily observed. This <br />site has been visited and photographed previously but was added as a photographic observation <br />point for continued review. The second spring 2008 photographic observation point was <br />established along the Box Canyon road to assess any changes to a series of sandstone outcrops on <br />the east side of the canyon immediately above Longwall Panel 18 where the B-seam overburden <br />thickness is between 700 and 800 feet. <br />The number designations for these photographic observation points do not reflect the order in <br />which they were established but rather the order in which they were visited during the fall 2007 <br />field visit. This convention will be maintained (see Maps 1 and 2) with the exception of any new <br />photographic observation locations added as deemed appropriate. <br />Nearly all of these photographic observation locations were visited during the June 4 and 5, 2008 <br />field visit (see Maps 1 and 2 for these locations and associated number designations). Only <br />Photographic Observation Points 1 and 7 were not visited due to time constraints associated with <br />inclement weather. It is anticipated that each of the photographic observation locations will be <br />visited and photographs obtained during future field visits. <br />831-032.790 <br />August 2008 <br />Wright Water Engineers, Inc. <br />Page 13