2014-05-13_PERMIT FILE - C1996083A (3)

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2.05.6(6) Subsidence Monitoring Monument Location Frequency Purpose 17 -A Hubbard Creek Quarterly To confirm subsidence does not occur in the limited extraction zone along Hubbard Creek. B -8 Panel, the last panel adjacent to Hubbard Creek, was complete by the end of 2009. Monitoring will cease at the end of 2011 which is two years after the B -8 panel was complete. To determine subsidence over multiple seam mining. The subsidence monuments will have pre - longwall mining base line measurements, post D Seam longwall mining measurements and post B Seam longwall mining measurements. Monitoring of these 20 monuments will be quarterly through 2007 and quarterly in 2009 at which time monitoring of the 20 monuments will cease. 17 -B Hubbard Creek Quarterly 17 -C Hubbard Creek Quarterly 17 -D Hubbard Creek Quarterly 17 -E Hubbard Creek Quarterly 17 -F 24 -D Hubbard Creek Monuments are located above the west D -Seam and west B- Seam panels. The D -Seam panels were numbered WD -1, WD -2 & WD -3 and were mined from 3/04 to 3/05. The B- Seam panels were numbered B -1, B -2 & B -3 and were mined from 4/05 to 10/06. Quarterly Quarterly 24 -E Quarterly 24 -F Quarterly 24 -G Quarterly 25 -A Quarterly 25 -B Quarterly 25 -C Quarterly 25 -D Quarterly 25 -E Quarterly 25 -F Quarterly 26 -A Quarterly 26 -B Quarterly 26 -C Quarterly 26 -D Quarterly 26 -E Quarterly 26 -F Quarterly 26 -G Quarterly 27 -A Quarterly 27 -B Quarterly 27 -C Quarterly 37 -A, B, C & E Terror Creek Quarterly To confirm subsidence does not occur in the limited extraction zone along Terror Creek or the Transmission Line 37 -D & F Transmission Line Towers Quarterly Seasonal access difficulties usually restrict quarter monitoring to three times per year. PR -13 2.05-163- 02/13