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2.05.6(6) <br />Subsidence Monitoring <br />Monument <br />Location <br />Frequency <br />Purpose <br />17-A <br />Hubbard Creek <br />Quarterly <br />To confirm subsidence does not occur <br />in the limited extraction zone along <br />Hubbard Creek. B-8 Panel, the last <br />panel adjacent to Hubbard Creek, was <br />complete by the end of 2009. <br />Monitoring will cease at the end of 2011 <br />which is two years after the B-8 panel <br />was complete. <br />17-B <br />Hubbard Creek <br />Quarterly <br />17-C <br />Hubbard Creek <br />Quarterly <br />17-D <br />Hubbard Creek <br />Quarterly <br />17-E <br />Hubbard Creek <br />Quarterly <br />17-F <br />Hubbard Creek <br />Quarterly <br />24-D, E, F, G <br />Monuments are <br />located above <br />the west D -Seam <br />and west B- <br />Seam panels. <br />The D -Seam <br />panels were <br />numbered WD -1, <br />WD -2 & WD -3 <br />and were mined <br />from 3/04 to <br />3/05. The B- <br />Seam panels <br />were numbered <br />B-1, B-2 & B-3 <br />and were mined <br />from 4/05 to <br />10/06. <br />Quarterly <br />To determine subsidence over multiple <br />seam mining. The subsidence <br />monuments will have pre-longwall <br />mining base line measurements, post D <br />Seam longwall mining measurements <br />and post B Seam longwall mining <br />measurements. <br />Monitoring of these 20 monuments will <br />be quarterly through 2007 and quarterly <br />in 2009 at which time monitoring of the <br />20 monuments will cease. <br />25-A <br />Quarterly <br />25-B <br />Quarter) y <br />25-C <br />Quarterly <br />25-D <br />Quarterly <br />25-E <br />Quarterly <br />25-F <br />Quarterly <br />26-A <br />Quarterly <br />26-B <br />Quarterly <br />26-C <br />Quarterly <br />26-D <br />Quarterly <br />26-E <br />Quarterly <br />26-F <br />Quarterly <br />26-G <br />Quarterly <br />27-A, B, C <br />Quarterly <br />27-B <br />Quarterly <br />27-C <br />Quarterly <br />37-A, B, C & E <br />Terror Creek <br />Quarterly <br />To confirm subsidence does not occur in <br />the limited extraction zone along Terror <br />Creek or the Transmission Line <br />Monitoring to Begin One Year Before <br />Longwall Mining in the Area <br />37-D, F, G, H, I, <br />J, K& L <br />Transmission <br />Line Towers <br />Quarterly <br />Seasonal access difficulties usually restrict quarter monitoring to three times per year. <br />PR -14 2.05-177- 03/14 <br />