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• 2.05.6(6) <br />• <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 <br />occur in the limited extraction zone <br />along Hubbard Creek. <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 />17 -G <br />Future <br />Quarterly <br />17 -H <br />Future <br />Quarterly <br />t k S° 3J t n. L t f G i t •' 'tx*$ "' ti p a 9 k a.= # P <br />LYtt V 4 d KY F h4 u # <br />24 -D <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 <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 />24 -E <br />Quarterly <br />24 -F <br />Quarterly <br />24 -G <br />Quarterly <br />25 -A <br />Quarterly <br />25 -B <br />Quarterly <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 <br />Quarterly <br />27 -B <br />Quarterly <br />27 -C <br />Quarterly <br />37 -A <br />Terror Creek <br />Quarterly <br />To confirm subsidence does not <br />occur in the limited extraction zone <br />along Terror Creek or the <br />Transmission Line <br />37 -B <br />Terror Creek <br />Quarterly <br />37 -C <br />Transmission <br />Line Towers <br />Quarterly <br />37 -D <br />Quarterly <br />• ' Seasonal access difficulties usually restrict quarter monitoring to three times per year. <br />TR -65 2.05-125- 12/09 <br />A PPpoVED <br />4 II6 //O <br />