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Spring 2009 Subsidence and Geologic Field Observations <br />Box Canyon, Apache. Rocks, and South of Divide Mining Areas <br />• and soil are sloughing and falling toward and over the sandstone outcrop directly beneath the <br />reclaimed pad. An additional photograph of this area from a different vantage point can be found <br />in Section 5.6.2. <br />• Figure 10. Eastward view of Location 6 showing the downslope movement of surface vegetation, <br />soil and colluviums toward and over a sandstone outcrop beneath the reclaimed MDW pad. <br />5.2 Traverse B -B' <br />Traverse B -B' begins at a point along Sylvester Gulch Road (along Traverse A -A') at the mouth <br />of the first east side canyon of Sylvester Gulch and continues southward, then southeastward, to <br />the head of the valley where it intercepts the main West Flatiron access road (part of Traverse C- <br />C') above mined Longwall Panel 16. B' is located approximately 800 feet west of the area known <br />as Twin Ponds (Ponds P27 -2 and P27 -3) as shown on Map 1. <br />This traverse is located mostly above portions of the B -seam coal that have not been, and will not <br />be, mined. The traverse, however, is located in the area of mining influence of various <br />previously -mined longwall panels. Exceptions include a short segment (about 1,500 feet) <br />starting at B which is above mined Longwall Panel 25 and the last segment (about 3,500 feet) <br />near B', which is over the Box Canyon mains and western ends of mined Longwall Panels 15 and <br />16. Overburden depth to the B -seam varies from about 450 feet at B and gradually increases to <br />• approximately 1,050 feet at B'. <br />tf31- u32J91 Wright Water Engineers <br />November 2009 <br />