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• <br /> <br />' _ ~ ~ PRE- AND POST MINING DRAINAGE SUMMARY <br />Drainage Section Postmine Premine Drefnage Postmine Drainage Premirie Postmine Pramine Elevation Postmine Elevation <br />Identification ~ Pramine - Length (ftl Area facl Area (acl Slope .. Scope <br /> Length Iftl ~ (%1 1%) U er Lower Upper Lower <br />YPM-1 4050 4015 99.2 95.1 6.9 8.7 7900 7540 7900 7575 <br />YPM-2 410 545 2.8 8,3 23.2 12.8 7785 7690 7760 7690 <br />YPM-3 1600 1650 51.6 68.0 15.0 13.6 7640 7400 7640 7400 <br />VPM-4 1540 1055 19.9 17.7 14.6 71.8 7575 7350 7475 7350 <br />YPM-5 1400 2380 25.7 41.0 13.2 11.8 7500 7315 7600 7320 <br />YPM-6 6940 3125 310.6 312.5 9.4 12.8 7925 7275 7675 7275 <br />YPM-7 1490 1560 60.8 59.8 16.1 13.1 7660 7420 7625 7420 <br />YPM-8 500 1070 26.7 29.1 18.0 11.7 7590 7500 7625 7500 <br />VPM-9 820 930 40.3 40.1 25.0 16.7 7565 7360 7525 7330 <br />YPM-10 3400 3160 90.1 89.8 14.7 15.2 7560 7050 7540 7075 <br />YPM-11 6800 1340 478.7 462.5 6.7 11.0 7750 7010 7080 6990 <br />YPM-12 2450 2450 145.1 145.1 i4.i 74.1 7375 7030 7375 7030 <br />VPM-13 NA 1130 NA 25.2 NA 24.3 NA NA 7875 7400 <br />YPM-3A NA 1260 NA 13.3 NA 15.7 NA NA 7690 7500 <br />YPM-6A NA 1065 NA 18.2 NA 18.9 NA NA 7575 7395 <br />VPM-14 NA 850 NA 15.0 NA 20.0 NA NA 7650 7480 <br />VPM-16 NA 960 NA 16.4 NA 20.3 NA NA 7275 7080 <br />Notes: 11 Drainage lengths measured from the highest elevation of an established drainage channel to the lowest elevaion of the reconstructed channel. <br />21 Refer to Exhibit 20-2 for ost minin drains a channel locations. <br />PR-02 9 Revised 03/05 <br />