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Subsidence Field Observations <br />West Elk Mine <br />August 28 and 29, 2001 <br />• Vegetation appears to locally accumulate in the surficial material above some <br />underlying cracks in the bedrock (Figure 6). <br />831-032.560 Wright Water Engineers, Inc. Page 9 <br />September 2001 <br />Figure 5. Recent crenulate crack located in surficial material and <br />bedrock. This crack is as much as G inches wide in the <br />surficial material and as much as 3%, inches wide in the <br />underlying bedrock. <br />Figure 6. Westward view of the crack in the bedrock. Vegetation <br />appears to be accumulating along the crack. <br />