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G. Transfer of Wells <br />At the conclusion of mining, the two wells used in the operation will be transferred <br />back to the owners at the written request of the surface owners (4.05.14). <br />H. Discharge of Water into an Underground Mine <br />No surface water will be discharged into the underground mine workings (4.05.15). <br />I. Probable Hydrological Consequences <br />The Hay Gulch alluvial valley floor (AVF) has been identified as an aquifer in the <br />study azea. The Blue Flame Coal and La Plata No. 1 Mines have been reclaimed and <br />any impacts to the Hay Gulch aquifer would be insignificant . Sediment control <br />structures at the King Coal Mine have been designed to minimize, to the extent <br />possible, impacts to the alluvial aquifer. The sediment ponds at the National King <br />Coal operation has discharged into the AVF only one time and this was after a severe <br />thunderstorm that exceeded the 100 year event in less than one hour. The sediment <br />ponds at the King Coal Mine have been designated to control the runoff from a <br />10-yeaz, 24-hour storm event. No dischazge is expected from any of these ponds due <br />to a storm event of lesser magnitude, or as a result of snowmelt. Furthermore, <br />monitoring of the alluvial aquifer down gradient from the National King Coal <br />operation indicates that the quality of the alluvial aquifer is not being diminished by <br />coal mining operations. Alluvial water quality monitoring programs committed to by <br />National King Coal will help to limit the potential for future impacts to this alluvial <br />system. <br />Based on the results of King Coal's hydrological monitoring during the past five yeazs, <br />the hydrologic chazacteristics of the Hay Gulch alluvial aquifer, and to the manner in <br />which the mining operations aze, or proposed to be, conducted, it has been determined <br />that no significant cumulative hydrologic impacts to the alluvial aquifer will occsr. <br />Pursuant to C.R.S. 34-33-114(2)(C), the Division has assessed the probable cumulative <br />hydrologic impacts to the ground water and surface water basins defined in this <br />document, from permitted and anticipated mining operations. The Division fmds that <br />the King Coal operations have been designed to prevent material damage to the <br />hydrologic balance outside the permit azea. <br />Surface Water Effects <br />All runoff from the disturbed azea at the mine site will be routed through the two <br />sediment ponds. Effects ofmining on this water will involve changes in the magnitude <br />and duration of runoff and changes in water quality. <br />The effects on water quantity are expected to be minimal. An increase in <br />imperviousness due to the construction or roads and buildings can be expected to cause <br />15 <br />