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3.0 HYDROLOGY <br />• 3.1 GROUND WATER <br />The proposed highwall miner will remove a small portion of the Wadge/Wolf Creek seams in <br />comparison to mining that has already occurred upgradient. The existing monitoring welts will <br />be used to monitor for any measurable ground water impact throughout the life of the mining <br />operation. Any additional impacts to the down gradient Wadge/Wolf Creek aquifers from the <br />highwal! mining will be negligible (unmeasurable? for the following reasons: <br />1. The total area of additional disturbance is quite small in comparison to the surface <br />mined areas. <br />2. The Wadge/ Wolf Creek coals have very low transmissivities. <br />3. The previously mined dragline pits have had minimal pit pumping, therefore SCC- is <br />anticipating very small quantities of additional discharge caused by the highwall miner <br />operations. Any necessary pit dewatering activities will follow the procedures <br />• described in Tab 13. <br />4. The premining ground water flow should reestablish itself following backfilling of the <br />final pit areas that has been highwall mined. <br />3.2 SURFACE WATER <br />Surface water quantity and quality should not be affected by the highwall miner mining <br />operation since drainage will be handled in the same manner as existing final highwall <br />stripping conditions. The postmining reclaimed surface will be blended with the surrounding <br />spoils and topography. The surface will be revegetated in accordance with the approved <br />revegetation plan. Should subsidence occur, surface drainage will not be adversely affected <br />as no postmining drainage will course over the propose highwall miner area. <br />4.0 OWNERSHIP <br />• The surface and coal is owned by different entities but SCC holds coal leases on those areas <br />proposed to be highwall mined. Refer to Exhibit 3-1 in Tab 3 of the permit application <br />package for any details. <br />TR-25 72-2-4 Revised 4/04 <br />