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Section 780.21(b) Continued. <br />n <br />areas, injury can be mitigated by provleion and supplemental water <br />available to Rerr Coal for augmentation. The water rights to be <br />used in the plan for augmentation are listed in Exhibit 26, Kerr <br />Coal Water Rights Documents. Kerr Coal can in fact supply suffi- <br />cient water to mitigate potential problems with respect to water <br />availability downstream from the mine plan area, as documented in <br />Section 779.17. <br />Ground Water Quality Protection <br />• <br />Ground Water Occurrence <br />Ground water occurs in three forms in the mine plan area; perched <br />water in pockets of upland terrace deposits, alluvial water under <br />the intermittent streams, and artesian water in the confined <br />Sudduth coal seam. The overburden is not saturated in the mine <br />plan area. Mining will not intercept isolated pockets of perched <br />water in upland terrace deposits since mining will be conducted <br />away from the only known spring to discharge from such deposits, as <br />shown on Map 15, Kerr Mine Area Ground Water hydrology. Alluvial <br />water systems will be protected from disturbance by the establish- <br />ment of stream buffer zones. Artesian water in the coal seam will <br />be affected by mining. Amore thorough description of groundwater <br />hydrology is set forth under Section 779.15; a description of <br />possible effects of mining follows., <br />Potential Impacts on Ground Water Quality. <br />Mining activities have the potential of creating changes in the <br />ground water quality in terms of Total Dissolved Solids (TDS) <br />concentrations, ion balance, pH and toxicity. The potential mech- <br />anisms of impact are: 1) exploration drilling; 2) overburden <br />removal and placement; 3) construction of temporary overburden <br />stockpiles; 4) exposure of toxic, acid- or alkaline-producing <br />material; and 5) detention of surface water on spoil. <br />780-102 <br />