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TABLE 2 <br />MAXIMUM SUBSIDENCE PARAMETERS FOR <br />SOUTH OF DIVIDE MINING AREA t ' 1 <br />Parameter <br />Panels E1 - E4 (t = 8 to 14 ft) <br />Panels E5- E8 (t = 12 to 14 ft) <br />Panel E9 (t = 12 to 14 ft) <br />WId:V Max <br />E1: 10801625 = 1.73 <br />E5: 1080/500 = 2.16 <br />E9: 1080/500 = 2.16 <br />Min <br />1080 / 1425 = 0.76 <br />1080 / 1100 = 0.98 <br />1080/550 = 1.96 <br />Max <br />E2: 1080/400 = 2.70 <br />E6: 1080/500 = 2.16 <br />Min <br />108011100 = 0.98 <br />1080/1200 = 0.90 <br />Max <br />E3: 1060/600 = 2.16 <br />E7: 1080/550 = 1.96 <br />Min <br />1080/1100 = 0.98 <br />1080/1250 = 0.86 <br />Max <br />E4: 1080/400 = 2.70 <br />E8: 1080/675 = 1.60 <br />Min <br />1080/1025 = 1.05 <br />1080/825 = 1.31 <br />t -8ft <br />t =14ft <br />t =12ft <br />t =14ft <br />t =12ft <br />t =14ft <br />S�= a., -t <br />0.80 to2.4ft <br />1.4 to4.2ft <br />1.2 to3.6ft <br />1.4 to 4.2 ft <br />1.2 ft <br />1.4ft <br />(aco =Scdt) <br />(0.1 to 0.3) <br />(0.1 to 0.3) <br />(0.1 to 0.3) <br />(0.1 to 0.3) <br />(0.1) <br />(0.1) <br />S a•t <br />4.8 to 6.4 ft <br />8.4 to 11.2 ft <br />7-2 to 9.6 <br />8.4 to 11.2 ft <br />8.4 to 9.6 ft <br />9.8 to 11.2 ft <br />(a = S„Jt) <br />(0 -6 to 0.8) <br />(0.6 to 0.8) <br />(0.6 to 0.8) <br />(0.6 to 0.8) <br />(0.7 to 0.8) <br />(0.7 to 0.8) <br />Sm /d ( <br />0.00377 to <br />0.00590 to <br />0.00576 to <br />0.00672 to <br />0.01527 to <br />0.01782 to <br />0.0160 <br />0.0280 <br />0.0192 <br />0.0224 <br />0.0192 <br />0.0224 <br />M (22 to 2.3 S )') <br />0.007 to 0.037 <br />0.013 to 0.064 <br />0.013 to 0.044 <br />0.015 to 0.052 <br />0.034 to 0.044 <br />0.039 to 0,052 <br />E (In terms of )�) <br />(1.2 to 1.4 S. /d) /d] <br />0.004 to 0.022 <br />0.007 to 0.039 <br />0.007 to 0.027 <br />0.008 to 0.031 <br />0.018 to 0,027 <br />0.021 to 0.031 <br />-E (in terms of Sm /d) <br />( -1.2 to -1.5 Sm /d) <br />-0.004 to -0.024 <br />-0.007 to -0.042 <br />-0.007 to -0.029 <br />-0.008 to -0.034 <br />-0.048 to -0.029 <br />-0.021 to -0.034 <br />Maximum Crack 1 <br />5 -10ft <br />5 -15It <br />5 -10ft <br />5 -15 ft. <br />5 -10ft <br />5 -15ft <br />Depth (5l 2 <br />10 -20ft <br />15 -35ft <br />15 -25ft <br />15 -35ft <br />15 -25ft <br />15 -35ft <br />Break Angle M <br />0 -5 <br />0 -5° <br />0 -5 <br />0 -5° <br />0 -5 <br />0 -5 <br />Angle of Draw (B) <br />14 - 19° <br />14-19 <br />14 - 19° <br />14-19' <br />14-19' <br />14-19' <br />)') Maximum tilt and strain parameters apply only to ground surfaces with slopes less that 30 percent; values may be greater on slopes <br />steeper than 30 percent. <br />All panels are numbered according to planned panel identifications. <br />Subsidence and subsidence factor above chain pillars. <br />(4' Subsidence (maximum vertical displacement) above longwall panel centers, based on planned coal extraction thickness listed. <br />Ratio of the range of maximum vertical displacement to overburden depth range for the nine planned longwall panels. <br />°) Maximum range of tilt in terms of Sm /d; values of 2.2 to 2.3 Sm /d are obtained from the graph in Figure 5. <br />Maximum range of horizontal strain in terms of S,/d; values for tensile (positive) strain of 1.2 to 1.4 S and compressive <br />(negative) strain of -1.2 to -1.5 Sm /d are obtained from the graph in Figure 5. <br />° f Maximum crack depth (in feet) in bedrock predicted to locally occur on or near steep slopes and ledges in the Minnesota Creek and <br />Lick Creek drainage areas and above barrier pillars and rigid chain (gate road) pillars. The first depth range (1) is for bedrock <br />sloping less than, or equal to, 30 percent; the second depth range (2) is for slopes more than 30 percent. Add 5 to 15 feet where <br />thick, brittle sandstones occur in ridges and near dills. No cracks are predicted to occur in alluvium. No cracks are predicted to <br />occur at the surface of colluvium thicker than about 10 feet. <br />" Angle measured from a vertical reference. <br />