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~ • <br />i <br />- . TABLE.20-2 <br />PRE- AND POST MINING DRAINAGE SUMMARY <br />Drainage Section Postmine Premina Drainage Postmine Drainage Premina Postmine Premina Elevation Postmine Elevation <br />Identification Premine Length Iftl Area lac) Area lac) Slope Slope <br /> Length Iftl I%) 1%) U er Lower Up er Lower <br />VPM-1 4050 4050 99.2 99.2 8.9 8.9 7900 7540 7900 7540 <br />VPM-2 410 520 2.8 4.3 23.2 18.3 7785 7690 7785 7690 <br />YPM-3 1600 1760 51,6 48.7 15.0 13.6 7640 7400 7640 7400 <br />YPM-4 1540 1540 19.9 17.7 14.6 14.6 7575 7350 7575 7350 <br />YPM-5 1400 2200 25.7 43.1 13.2 13.4 7500 7315 7615 7320 <br />YPM-6 6940 7020 310.6 315.4 9.4 9.3 7925 7275 7925 7275 <br />VPM~7 1490 1525 60.8 57.9 16.1 15.4 7660 7420 7655 7420 <br />YPM~B 500 330 26.3 29.1 18.0 24.2 7590 7500 7580 7500 <br />YPM-9 820 1180 39.2 40.1 25.0 16.5 7565 7360 7555 7360 <br />YPM~10 3400 3320 90.1 89.8 15.0 15.5 7560 7050 7555 7040 <br />YPM~11 6800 6940 478.7 462.5 10.8 11.0 7750 7010 7750 6990 <br />Notes: 11 Drainage lengths measured from [he highest elevation of an established drainage channel to [he lowest elevation of the reconstructed channel, <br />21 Refer [o Exhibit 20-2 for ost minin drains a channel locations. <br />Revised 3/00 <br />