Laserfiche WebLink
Subsidence Fleld Observations <br />West Elk Mme <br />• Cracks are located alxwe the wchtern part of longwall Panel I~ ulxwe the hwdgate entries <br />and northward above the mined-cwt panel. <br />• I he arch containine the cr^cks is roughly'~0 fl in an east-west and north-south direction. <br />• the cracks arc us much as ?.5 inches wide. 10 ti to I OU fl long, and generally trend east-west, <br />N40°W', N70°W. 'fhc cast-west trending cracks arc roughly parallel to the hcadgatc entries <br />of longwall Pstncl 14. <br />Figures 11 and 12. Subaidenco cncka in sandstone (left) and clay, colluvium, and soil (right) that are <br />located above the wastem part of mined longwall Panel 14. <br />Locution c): <br />Irregular subsidence crocks arc located above the hcadgutc entries utwvc the western port of <br />longwall Puncl 14. 'I'hc cracks occur in the hunk of the drill rood, which is compuxd of <br />weathered hednmk, colluvium, and soil f Figure 13). <br />• 1'hc cmcks, which are as much as R inches wide. trend N6(1°W' to cast-west. <br />• 111e length of the crocks ranges fmm about 10 to 25 ft. Ilowever, they am likely longer <br />bcc:utse the surticial material bridges (caversl the cracks. <br />• I he cracks disappear beneath soil and grass and leaves tiom scrub ask brush. <br />831-032 570 Wnghl Water Engineers, Inc Page 18 <br />December 2002 <br />