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Subsidence and Geologic Field Observations <br />Apache Rocks and Box Canyon Mining Areas <br />July 12-15, 2004 <br />4.1.4 Traverse D-D' <br />Vehicle traverse from fork in roads at D' to methane drainage well site MDW-22-03. <br />• Traversed above un-mined longwall panels 24 and 23 and above mined Iongwall panel 22 on <br />top of West Flatiron. <br />• Weathered bedrock, colluvium, and local soil were encountered on and neaz the road. <br />• The overburden depth to the B Seam ranges from 2,050 to 2,200 feet. <br />Location 2: <br />Point is located on top of a cliff that occurs in the uppermost massive sandstone of the Ohio <br />Creek Member of the Mesaverde Formation. The point is also located at the head scarp of Box <br />Canyon. <br />• The point is located above mined longwall pane122, about 300 feet south of the four tailgate <br />entries of the panel. The overburden depth to the B Seam is about 2,200 feet. <br />• The location was selected to provide a baseline image (higher resolution image than was <br />taken last yeaz) of a rockfall and landslide azea, which is located on the east side of Box <br />Canyon above an un-mined azea in order to compaze with the condition of the landslide after <br />mining is completed. <br />• The landslide is located above the projected tailgate entries of un-mined longwall panel 19 <br />and the northern, middle part of the panel (Figure 4 and Map 1). <br />831-032.640 Wright Water Engineers, Inc. Page 12 <br />September 2004 <br />