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4-17a <br />vertical structures such as faults occur, the vertical infiltration <br />or interconnection between several aquifers can be significant. <br />These conditions were confirmed by the experience in Book Cliffs <br />mines and by results of the overall evaluation of exploration <br />boreholes. <br />Above the stream beds, only limited ground water occurrence is <br />experienced in the sandstone and coal seams. Beneath the local <br />stream beds, sandstone strata and coal seams are saturated. In <br />cases where these aquifers have well developed fracture systems, <br />they could yield a small amount of water when intersected. A <br />substantial water inflow into the mines can be expected only in <br />cases when the underground workings are connected through major <br />• fracture systems (a fault for example) with saturated alluvial <br />sediments of considerable extent. <br />The results of exploration drilling indicated that there is no . <br />significant sandstone strata, which could be considered as an <br />aquifer, within 50 feet below the Cameo coal seam. The typical <br />stratigraphic column in the vicinity of the Cameo coal seam is <br />shown in Figure 2.1-12. <br />• <br />