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State Req. <br />livestock and domestic use. The results of this approach are summarized • <br />in Tole 7-6. <br />Five aquifers of potential significance have been identified at the <br />Seneca II Mine using the criteria in Table 7-5. These aquifers are listed <br />below in their order of relative importance: <br />I. Trout Creek Sandstone <br />2. Wadge Overburden <br />3. Wadge Coal Seam <br />4. Alluvium <br />5. Reclaimed Spoil <br />The stratigraphically higher Twentymile sandstone member outcrops in <br />the adjacent areo west of the permit boundary and will not be disturbed <br />by mining activities. Major aquifers such as the Twentymile and Trout <br />Creek sandstones are markedly more significant areally than middle coal <br />group aquifers becouse of their thickness, continuity, and wafer yielding • <br />ability. Middle coal group aquifers are therefore considered to be im- <br />portant only in areas where the Twentymile sandstone is absent or un- <br />saturated (outcrops) and drilling costs to reach the Trout Creek are <br />prohibitive. Such areas comprise an almost insignificant portion of the <br />general area. A closer evaluation of these aquifers and how lithology and <br />structural complexities control ground water occurrence in terms of <br />quality and availability is provided below. <br />a. Ground Water Quality <br />4.05.13(b) The chemical characteristics of ground water hwe been identified for <br />various aquifer systems occ~irring in the permit area utilizing wells <br />completed in overburden, coal, alluvial and reclaimed spoil materials. <br />Wells that were sampled include: GW-S2, GW-55, GW-56, GW-S6-A, <br />GW-58, GW-SIO, GW-SI I, GW-514, GW-515, GW-S17, GW-519, GW-521, <br />GW-525, GW-526, GW-527, GW-531, GW-532, GW-533, GW-S40-W, and <br />GW-540-0. Well completion information for these wells were sum- <br />marized in Table 7-5. Appendix 7-I contains a complete description of <br />7-18 Revised 5/27/81 <br />