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r <br /> r <br /> 4 <br /> d. National King Coal , Inc. has demonstrated that <br /> mining will not reduce or degrade the quantity or <br /> quality of water supplying sub-irrigated or flood <br /> irrigated areas significant to farming on the Hay <br /> Gulch AVF at the confluence with Pine Gulch <br /> (approximately 3 .5 miles southwest of the permit <br /> area) . National King Coal, Inc. has submitted a <br /> mining plan showing elongated pillars supporting all <br /> entries under Pine Gulch drainage system. These <br /> pillars will not be extracted on final retreat, <br /> thereby providing perpetual stability for the Pine <br /> Gulch drainage, and preventing degradation of the <br /> quantity or quality of water in Pine Gulch. <br /> Further, irrigation of Pine Gulch at the confluence <br /> with Hay Gulch is by diversion ditches originating <br /> at the La Plata River. <br /> Subsidence <br /> 6. National King Coal , Inc. has submitted a mining plan <br /> which should prevent damage to the hydrologic balance <br /> outside the permit area and prevent subsidence in Pine <br /> Gulch. The mining plan shows elongated pillars supporting <br /> all passages under Pine Gulch drainage system. These <br /> pillars will not be extracted on final retreat, thereby <br /> providing perpetual stability to the Pine Gulch drainage. <br /> Additional measures have been proposed to limit or <br /> preclude damage at higher elevations outside Pine Gulch. <br /> An ongoing geologic mapping program is being carried out <br /> which includes the plotting of cleat systems. Every <br /> effort. where practical, will be made to mine at the <br /> optimum angle to insure pillar strength. <br />