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Spring 2011 Subsidence and Geologic Field Observations <br />Box Canyon, Apache Rocks, and South of Divide Mining Areas <br />III soil and colluvium derived primarily from the Wasatch Formation were observed along this <br />traverse. <br />Conditions observed along this traverse since fall 2009 (including the most recent spring 2011 <br />field visit) represent pre- mining baseline conditions. A small slope failure was noted during the <br />most recent field visit (Location 4). Details associated with this location are discussed below. <br />Photographic Observation Point 13, as established in fall 2009, is also located along this traverse. <br />This point was created to provide an observation point for the elevated areas to the north of Dry <br />Fork where several of the E -seam Longwall Panel MDW drill pads are located. Further <br />discussion of this location is provided in Section 5.5.2. <br />5.5.1 Location 4 <br />Location 4 is the site of a small slope failure not influenced by mining activities. This location is <br />above unmined E -seam Longwall Panel E4 in an area with approximately 800 feet of overburden <br />depth to the E -seam. The failure covers an area of approximately 6,000 square feet (0.14 acres). <br />Figure 16 shows a portion of the failed slope with the greatest elevation offset (approximately 3 <br />feet). <br />831 - 032.793 <br />September 2011 <br />Wright Water Engineers, Inc. Page 26 <br />