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Subsidence Field Observations <br />West Elk Mine <br />July 22-24, 2003 <br />II <br />1 <br />1 <br />• There was no sign of the cracks observed in August 2002 (see page 10 of the 2002 report for <br />details). <br />4.1.5 Traverse E-E' <br />Traverse E-E' begins at fork in drill roads to West Flatiron and to Drill Holes 96-27-1 and SOM- <br />123. <br />• Traversed above mined-out longwall Panels 14, the northernmost, eastern part of longwall <br />Panel 15, and the gate road pillazs (two rows of rigid-pillar design) between the two panels <br />(Map 1). <br />• Colluvium, soil as well as sandstones, and claystones of the Barren Member of the <br />Mesaverde Formation were exposed in the traverse. <br />• Overburden depth to the B-Seam ranges from 1,500 to 1,625 feet. <br />Location 3: <br />Located neaz Drill Hole DH-15-09 (Location 8 in the 2002 report). <br />• The numerous subsidence cracks observed in August 2002 at this location are now in various <br />states of weathering, sloughing, healing, and sealing, depending on the type of material in <br />which the cracks occur. <br />• The cracks, which were as much as 2.5 inches wide, ranged from 10 feet to 100 feet long, and <br />trended east-west, N40°W, and N70°W in 2002, are now the same width and length in <br />sandstone, bu[ much less wide and long in Colluvium and soil. <br />• The cracks in sandstone look similar to a yeaz ago, except for perhaps looking slightly older <br />(Figures 5 and SA). <br />831-032.610 Wright Water Engineers, Inc. Page 13 <br />September 2003 <br />