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Fall 2010 Subsidence and Geologic Field Observations <br />Box Canyon, Apache Rocks, and South of Divide Mining Areas <br />Figure 2. Fall 2009 northeastward view across the MDW E1-48 drill pad. <br />is <br />3.3 Traverse J-J' <br />Traverse J-J' begins at Traverse I-I' and continues in a west/northwestward direction along a <br />ridgeline across most of mined E-seam Longwall Panel E1 (and a small portion of E-seam <br />Longwall Panel E2) to numerous MDW drill pads (see Maps 2 and 4). Overburden depths along <br />this traverse vary from 1,350 to 1,450 feet over the B-seam and 1,050 to 1,250 feet over the E- <br />seam. <br />This traverse is generally flat and stable on soil and colluvium derived from the Wasatch <br />Formation and from intrusive rocks of the West Elk Mountains overlying consolidated bedrock <br />units of the Barren Member of the Mesaverde Formation. Numerous MDW drill pads are <br />accessible from this traverse including E I-15, E I-19, E I-26.5, E 1-3 0.5, E I-34, E 1-3 8, E2-38, <br />E I -42, E2-42, E2-44.5, E I-45, and E247.5. Each of these sites was visited during the fall 2010 <br />field activities. Mining had already occurred beneath each of these MDW pads. Cracks were <br />observed in only one of these MDW pads (E1-19) and is therefore included for specific <br />discussion as Location 2. This location is one of the westernmost MDW pads along this traverse. <br />831-032.792 Wright Water Engineers, Inc. <br />April 2011 <br />Page 8