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Subsidence Field Observations <br />West Elk Mine <br />August 27-29, 2002 <br />3.0 OVERVIEW OF FIELD SUBSIDENCE STUDIES DURING AUGUST 27-29, <br />2002 <br />L Mountain Coal Company (MCC) provided a 6-wheel, all-terrain vehicle (ATV) to increase <br />traverse efficiency and to provide a better look at the ground during the traverses than <br />would be possible from afour-wheel-drive vehicle. <br />2. Field knowledge of subsidence processes during past studies showed that roads, trails, and <br />areas clear of brush and tall grass were the most likely sites to see subsidence features <br />(cracks and bulges). Therefore, these azeas were selected to obtain maximum subsidence <br />information in the shortest period of time. <br />831-032.570 Wright Water Engineers, Inc. Page 6 <br />December 2002 <br />