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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 />No. Field Type Dimensions Approx. Approx. Fasting Northing Comments /Source <br /> Ref. X Y Z Volume <br />ft"3 Mass <br />Ibs <br />55 B44D 1 4.2 3.2 2.25 30 4536 14330 33180 Old faII:S1/S3 or S1/S4 7225 - 7250 or undercut S7 150 - 7200 <br />56 B44E 1 3.8 4.5 6 103 15390 14330 33180 Old faII:S1/S3 or S7/S4 7225 - 7250 or undercut S1 7150 - 7200 <br />57 845A 1 9.6 3.5 7 235 35280 14125 32920 Old fall lanar on undercut S1 7075 - 7125 <br />58 B45B 1 8 7 9.6 538 80640 14125 32920 Old fall lanar on undercut S1 7075 - 7125 <br />59 B46 1 12.8 9.6 8.6 1057 158515 14125 32970 Old fall lanar on undercut S1 7075 - 7125 <br />60 B47 1 11.2 8 8 717 107520 18860 36135 East fall area <br />61 B48 1 17.6 9.6 17.6 2974 446054 18975 36410 East fall area <br />62 B49 1 24 17.6 16 6758 1013760 19020 36540 East fall area <br />63 B50 1 9.6 8 9.6 737 110592 18960 36635 East fall area <br />64 B51 1 4.8 4.8 2.5 58 8640 18965 36490 East fall area <br />65 B52 1 4 6 2.25 54 8100 18875 36590 East fall area <br />66 853 1 11.2 4.8 8 430 64512 18860 36665 East fall area <br />67 B54 1 11.8 9.6 14 1586 237888 18810 36675 East fall area <br />68 B55 1 11.2 6.4 6.4 459 68813 18780 36600 East fall area <br />69 B56 1 11.2 5.3 5.5 326 48972 12750 33435 Old fall lanar S4 <br />70 B57 1 4.8 3.7 7.2 128 19181 12835 33325 <br />Page 3 of 3 <br />