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C] <br />• <br />2.05.6(6) <br />Subsidence Monitoring <br />Monument Location <br />17-A Hubbard Creek <br />17-B Hubbard Creek <br />17-C Hubbard Creek <br />17-D Hubbard Creek <br />17-E Hubbard Creek <br />17-F Hubbard Creek <br />17-G Future <br />17-H Future <br />24-D <br />24-E Monuments are <br />24-F located above <br />24-G the west D-Seam <br />25-A and west 13- <br />25-6 Seam panels. <br />25-C The D-Seam <br />25-D panels were <br />25-E numbered WD-1, <br />25-F WD-2 & WD-3 <br />26-A and were mined <br />26-B from 3/04 to <br />26-C 3/05. The B- <br />26-D Seam panels <br />26-E were numbered <br />26-F B-1, B-2 & B-3 <br />26-G and were mined <br />27-A from 4/05 to <br />27-B 10/06. <br />27-C <br />Frequency <br />Quarterly <br />Quarterly <br />Quarterly <br />Quarterly <br />Quarterly <br />Quarterly <br />Quarterly <br />Quarterly <br />Quarterly <br />Quarterly <br />Quarterly <br />Quarterly <br />Quarterly <br />Quarterly <br />Quarterly <br />Quarterly <br />Quarterly <br />Quarterlv <br />Quarterly <br />Quarterly <br />Quarterly <br />Quarterly <br />Quarterly <br />Purpose <br />To confirm subsidence does not <br />occur in the limited extraction zone <br />along Hubbard Creek. <br />To determine subsidence over <br />multiple seam mining. The <br />subsidence monuments will have <br />pre-longwall mining base line <br />measurements, post D Seam <br />longwall mining measurements and <br />post B Seam longwall mining <br />measurements. <br />Monitoring of these 20 monuments <br />will be quarterly through 2007 and <br />quarterly in 2009 at which time <br />monitoring of the 20 monuments will <br />cease. <br />• ' Seasonal access difficulties usually restrict quarter monitoring to three times per year. <br />MR-98 2.05 - 125 - 04/09 <br />f? PPRo ?E,ll <br />y/Z7/o 7