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<br />Twen Mile Coal Com an - Rockfall Hazard Anal sis <br />Table 2-1 Boulder Catalo ue <br />Type 1 Cuboid or trapezoid <br />2 Spheroid <br />3 Triangular prism <br /> <br />No. Field Type Dimensions Approx. Approx. Fasting Northing Comments /Source <br /> Ref. X Y Z Volume <br />ft"3 Mass <br />Ibs <br />1 81 3 18 14 14 1568 235200 18620 36230 West fall area <br />2 82 1 8 6 6 288 43200 18690 36230 West fall area <br />3 B3 1 4 4 4 64 9600 18590 38375 West fall area <br />4 B4 1 4 4 4 64 9600 18720 36250 West fall area <br />5 BS 1 4 4 4 64 9600 18110 34935 Old fall rim or u er face <br />6 B6 1 8 6.4 6.4 328 49152 18235 34930 Old fall• rim or u er face <br />7 B7 1 4 3 3 36 5400 18060 34950 Old fall rim or u er face <br />8 88 1 4 2.5 3.5 35 5250 18010 34975 Old fall rim or u er face <br />9 B9 1 7 3 4 84 12800 17915 35040 Old fall rim or u er face <br />10 810 1 6 5 4 120 18000 17865 34865 Old fall rim or u er face <br />11 811 1 4 3 4 48 7200 17930 34840 Old fall• rim or u er face <br />12 B12A 1 5 4 3 60 9000 17770 35080 Old fall• rim or u er face <br />13 8126 1 5 4 4 80 12000 17740 35045 Old fall rim or u r face <br />14 B13 1 3.5 1.5 2 11 1575 17680 35070 Old fall• rim or u r face <br />15 814 1 9.6 11.2 8 880 129024 15175 33240 Old fall S1/S4 wed a 7225 <br />16 815 1 9.6 14.4 10.4 14311 215654 15150 33270 Old fall S1/S4 wed a 7225 <br />17 B16 1 14.4 12.8 4.8 885 132710 15130 33260 Old fall S1/S4 wed a 7225 <br />18 B17A 1 19.2 8 14.4 2212 331776 15050 33285 Old fall la a lanar on S7 225 - 7275 <br />19 B17B 1 16 12.8 14.4 2949 442368 15050 33285 Old fall la a lanar on S1 7225 - 7275 <br />20 B17C 1 9.6 14.4 12.8 1769 265421 15050 33285 Old fall la a lanar on S1 7225 - 7275 <br />21 B18A 1 3.2 6.4 6.4 131 19661 15045 33370 Old fall• la a lanar on S1 7225 - 7275 <br />22 8188 1 6.4 6.4 6.4 262 39322 15045 33370 Old fall• la a lanar on S1 7225 - 7275 <br />23 819 1 8 6.4 6.4 328 49152 14990 33425 Old fall la a lanar on S1 7225 - 7275 <br />24 820 1 25.6 8 25.6 5243 786432 14980 33450 Old fall la a lanar on S1 7225 - 7275 <br />25 821 1 8 8.4 9.6 492 73728 16300 33690 Old fall• rim 7250 - 7275 <br />26 <br />27 622 <br />823 1 <br />1 9.6 <br />14.4 6.4 <br />9.6 9.6 <br />16 590 <br />2212 88474 <br />331776 16155 <br />15905 33845 <br />33755 Old fall• rim 250 - 7275 <br />Old fall: rim 7250 - 7275 or undercut S1 7200 - 7225 <br />Page 1 of 3 <br />