2015-01-27_PERMIT FILE - C1996083A (2)

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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. 17 -B Hubbard Creek Quarterly 17 -C Hubbard Creek Quarterly 17 -D Hubbard Creek Quarterly 17 -E Hubbard Creek Quarterly 17 -F 24 -D, E, F, G 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 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. 25 -A Quarterly 25 -B Quarter) y 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, B, C 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 Monitoring to Begin One Year Before Longwall Mining in the Area 37 -D, F, G, H, I, J, K& L Transmission Line Towers Quarterly Seasonal access difficulties usually restrict quarter monitoring to three times per year. PR -14 2.05-177- 03/14