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5.6 HYDROLOGY <br />Data from the New Horizon Mine Permit for the existing New Horizon Mine shows that three <br />' main factors influence the hydrology of this region: topography, lithology and structural setting. <br />Due to the variable lithologies of the Dakota, Chinle and Morrison Formations (interbedded <br />sandstones, siltstones, shales and coal), the hydrology is very complex for the deep aquifers. <br />' Unconsolidated Quaternary deposits, primarily of alluvial derivation, and the Dakota Formation, <br />present the greatest potential for aquifers in Third Park (Western Fuels Association, 1993). <br />' Coal exploration drilling would be restricted to the Dakota Formation and shallow <br />alluvial/colluvial stream bottoms of the Third Park plateau. <br />' The topography is generally indicative of what the water is doing under the surface. The <br />depressions can become discharge areas when the water levels are high, and conversely the <br />highs generally serve as recharge areas. However, the coal strata at Third Park is anticipated <br />to be relatively dry or contain little water because of the deeply incised streams around its <br />perimeter. Because the perimeter is incised to approximately 500 feet below the Third Park <br />average surface elevation, and given that the average total depth of a drill hole is approximately <br />134.6 feet, prominent aquifers and ground water levels (static wafer levels) are expected at <br />greater depths than the total depth of most holes drilled. Water levels and water discharged <br />during drilling will be closely monitored to provide good water quality information. Unlike the <br />area of the New Horizon Mine, (First Park), Third Park is not irrigated. <br />' Third Park Exploration License Application 15 <br />