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Section 2.04.7 Hydrology Description <br />•(1) Ground water information <br />(a) A description of the ground water hydrology including the depth <br />below the surface and the horizontal extent of the water table and <br />aquifers, the lithology and thickness of the aquifers, known uses <br />of the water in the aquifers and water table and the quality of <br />the subsurface water. <br />Ground water hydrology in the vicinity of Grand Mesa Coal Company's <br />Red Canyon ;1 Mine and proposed ;2 Mine permit area, consists of <br />two distrinct types of potential aquifers. These are the Creteceoue <br />age bedrock sandstone and coal seams (of which the "n" and "E" coal <br />seams are being mined) in the Mesaverde Group, and of more importance <br />the surficial glacial outwash and alluvial material covering a <br />large percentage of the mine permit area. <br />'~ <br />SEDROCR AQUIFERS <br />Potential bedrock aquifers in the vicinity of the Red Canyon ;1 Mine <br />• and proposed ;2 Mine permit area consists primarily of the coal seams i <br />themselves and the interbedded lenticular, very fine grained channel <br />type sandstone deposits. Except for the Rollins Sandstone (which <br />stratigraphy lies 150 + feet below the "D" coal seam), units are <br />discontinuous, fine grained, and indurated with calcareous cement, <br />as to be considered having negligible potential as aquifer systems. <br />Minor amounts of water which would be encountered in these sandstones ~ <br />would restrict their use to low capactiy domestic or stock watering i <br />wells only. The quality of water contained within these units is <br />rob ab 1 ~ <br />p y poor quality and cannot be used for potable drinking water <br />directly from a well. It is estimated that a well which penetrated <br />one or more of these thin discontinuous sandstones would produce <br />less than two to five gallons per minute. Only where the sands <br />are near the surface and recharge source, and contain secondary <br />porosity, such as jointing or fracturing, would they have any ~ <br />significant potential in the immediate area: Evidence of their <br />unsaturated nature and low yield potential comes from observing the <br />• roof of the persent Red Canyon ;1 Mine in numerous places. The ~, <br />sandstones are not yielding significant amounts of water into. the mine. <br />56 <br />. ~. <br />-.:.. <br />