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Subsidence Ftetd Observations <br />West Elk Mine <br />July 22.24, 2003 <br />• 11';dked above mined-out longwall Panel 13. The end of the traverse is located near the <br />middle of the panel (in a north-south direction). <br />• "fhe material encountered is mostly colluvium and soil, then txcomes mostly sandstone and <br />weathered sandstone towards the end of the travenc at Point O'. <br />• Overburden dcplh to the B-Scam rongcs from I, I50 to 1,350 feet. <br />Locution l2: <br />This point is located above the mid point (north-south orientation) of longwall Puncl 13. <br />• Numerous subsidence crocks, as much as l.S inches wide, were observed in this area on <br />September lG, 1999, when the longwall face +vas within the urea of mining influence of this <br />point (sec pages G-7 and Figures S and G of the 1999 report for further details). <br />• The crocks that were observed in the sandstone at that time are nearly all gone. Small <br />anticlines in the sandstone are nu longer visible. \o cracks are present in the weathered <br />bedrock and other su~ciul mutenal. Only two, small northward-trending cracks and a very <br />small northeashvard-trending branch crack were observed this time (Figure IS). <br />Figure I5. Only tNO small, north-vending cruck~ <br />~Icit loregroundl and a vcp~ small nonheasbtrendmg <br />Hack Imtddle gmundi are all that remain m thix area <br />that contained nwny crnckc m Septend+er 1999. <br />831.032.610 Wnght Water Engineers, Inc. Page 28 <br />September 2003 <br />