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z.o4.s(1) <br />Review of this data indicates t!:at the "D", "E", and "F" coal <br />seams are hydrologically isolated from one another. Significant <br />consistant differences in static water levels throughout seasonal <br />changes in 1980 indicate that the intervening claystones, shales <br />and lenticular sandstones are of such low vertical permeability <br />as to provide effective isolation of the water in each coal seam. <br />Data also indicates that except in F-1 (where the coal seam is <br />very shallow, exposed to atmospheric pressures and direct recharge) <br />the coal seams are not directly affected by surface waters. <br />Monitoring well F-1, with the decline of approximately two feet <br />in static level during the month of July 1980, gives some evidence <br />that it may be in direct communication with the water level in <br />the nearby drainage. Data from the "E" and "n" coal seams however, <br />indicated that they are isolated from the same surface drainage. <br />As can be seen on the Bedrock Configuration "tap, 2.04.5-2, the <br />surface entrance and workings of the nine itself will be located <br />in a shall drainage tributary to Ward Creek, upon bedroc:c units of <br />• the upper Mesaverde Group including the "D" and "F" coal seams. <br />Acne of these surface features will have a direct affect upon the <br />alluvial aquifers, since extensive glacial deposits are non- <br />existent in the immediate vicinity of the surface operations. <br />Any long term hydrologic effects on the ground water by the <br />surface operations would be limited to the effect of excavating the <br />coal seams themselves. Since no well in the vicinity of the permit <br />area appears to draw water supplies from either of these coal <br />seams, there would be no detrimental effect to other uses of water <br />in the area. The coal seams dip to the north beneath Grand Mesa <br />and become covered by several thousand feet of overlying material <br />in a short distance. The long term effects on the coal seam <br />water would have little detrimental effect because these coal seams <br />are too deep and of such poor quality water as to make them <br />unusable in most of the area north of the mine permit area. <br />Long term effects of mining the "D" and "F." coal seams will have <br />• influence on water quantity in the alluvial glacial outwash material. <br />P.s can be seen on the Isopach P!ap-Alluvial Aquifers, 2.04.5-3, the <br /> <br />