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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 />28 824 1 19.2 12.8 16 3932 589824 15750 33775 Old fall: rim 250 - 7275 or undercut S1 7200 - 7225 <br />29 825A 1 9.6 3.2 3.2 98 14746 15780 33915 Old fall: rim 250 - 7275 or undercut S1 200 - 7225 <br />30 6258 1 9.6 4.8 4.8 221 33178 15780 33915 Old fall: rim 250 - 7275 or undercut S1 200 - 7225 <br />31 825C 1 8 3.2 4.8 123 18432 15780 33915 Old fall: rim 7250 - 7275 or undercut S1 7200 - 7225 <br />32 6250 1 6.4 6.4 3.2 131 19661 15780 33915 Old fall: rim 7250 - 7275 or undercut S1 7200 - 7225 <br />33 826 2 3.2 32 4825 15830 33850 Old fall: rim 250 - 7275 or undercut S1 200 - 7225 <br />34 827 1 4.2 1.5 6.4 40 6048 16090 33780 Old fall: rim 7250 - 7275 or undercut S1 7200 - 7225 <br />35 828 1 3.2 2.3 6.4 47 7066 16180 33880 Old fall: rim 7250 - 7275 or undercut S7 7200 - 7225 <br />36 829 1 9.6 8 8 614 92160 16235 33610 Old fall: rim 7250 - 7275 or undercut S1 7200 - 7225 <br />37 830 1 9.6 8 9.6 737 110592 15745 33435 Old fall S1/S4 7200 - 7325 <br />38 831 1 4.8 2.9 6 84 12528 16805 34115 Old fall rim 7300 <br />39 832 1 12.5 6.4 7.2 576 86400 16675 34105 Oid fall rim or u er face 275 - 7300 <br />40 833 1 4.2 2.9 6.1 74 11145 16680 34125 Old fall rim 7300 <br />41 B34A 1 9.6 3.2 6.4 197 29491 16690 34150 Old fall S1/S4 failure - surtaces atinated <br />42 8348 1 8.5 5.5 3.8 178 26648 16690 34150 Old fall S1/S4 failure -surfaces atinated <br />43 835 1 8 4.5 11.2 403 60480 16860 34315 <br />44 836 1 11.2 9.8 19.2 2064 309658 16610 34375 Old fall lanar on S1 7280 <br />45 837 1 9.6 8 9.6 737 110592 16540 34455 Old fall lanar on S1 280 <br />46 838 1 8.7 3.2 8 223 33408 18010 34785 Old fall rim or u r face <br />47 839 1 8.8 16 8.9 1253 187968 14440 32900 Old fall S1/S3 wed a 7225 <br />48 840 1 1.4 4.2 6.4 38 5645 14390 33075 Old faII:S1/S3 or S1/S4 7225 - 7250 or undercut S1 7150 - 7200 <br />49 641 1 17.5 10.5 8 1470 220500 14370 33100 Old faII:S1 /S3 or S1IS4 7225 - 7250 or undercut S1 7150 - 7200 <br />50 842 1 6.4 3.2 4.8 98 14746 14390 33100 Old faI1:S1/S3 or S1/S4 7225 - 7250 or undercut S1 7150 - 7200 <br />51 843 1 8 4.16 9.6 319 47923 14315 33050 Old fall S1/S3 or S1/S4 7225 - 7250 <br />52 B44A 1 1.6 1 2 3 480 14330 33180 Old faII:S1/S3 or S1/S4 7225 - 7250 or undercut S1 7150 - 7200 <br />53 8448 1 3.2 2 3.2 20 3072 14330 33180 Old faII:S1/S3 or S1/S4 7225 - 7250 or undercut S1 7150 - 7200 <br />54 B44C 1 2 2.6 2.9 15 2262 14330 33180 Old faII:S1/S3 or S1/S4 225 - 7250 or undercut S1 7150 - 7200 <br />Page 2 of 3 <br />