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AdRik <br /> -37- <br /> There are no known users of ground water from these strata within at <br /> least a two-mile radius from the edge of the mine. Therefore, no impacts <br /> should result from the dewatering of the mine workings. When mining is <br /> completed in Coal Basin, the water levels in the aquifers should showly <br /> return to original , pre-mining elevations. <br /> The disposal of mine and processing waste materials at the mine have the <br /> potential to degrade the quality of the alluvial ground water of Coal <br /> Creek. A geochemical analysis of the roof and floor rock and coal (see <br /> page III-D-37 of the permit application) failed to indicate any toxic or <br /> hazardous materials. In addition, seven years of ground and surface <br /> water monitoring, during which time similar wastes were being disposed <br /> of, indicate no adverse affects to date. Therefore, it is concluded that <br /> this potential impact is insignificant. If an impact were occur, the <br /> existing monitoring system, is adequate for early detect' <br /> The proposed rock tunnel at the mine will be con ucted into the hlancos <br /> shale fornation and proceed e stratigr c <br /> u c ree coa s oughout this distance, the jA <br /> t oz e%tte, i s nd ea-eitiddl s s es 11 �.( "s <br /> Lve <br /> potential aquifers the wa ers otl these aqua ers may mix <br /> h within the tunnel ? <br /> ecause o is, i t important that, upon final reclama ion, these <br /> aquifers be seal off such that no further mixing would occur. In <br /> addition, t urf ace seal of the tunnel must be adequate to prevent the <br /> leakag ground water onto the surface. Therefore, the following <br /> st ation is added to the permit: k� <br /> k Stipulation No. 5 <br /> r BY FEBRUARY, 1 , 1984, THE PERMITT SHALLkB11IT AN ACCEPTABLE PLAN �(m <br /> ` FOR SEALING THE RUCK TUNNEL ADIT THIS PLAN SHALL CONTAIN, AT A <br /> Aw MINIMUM, SPECIFICATIONS FOR SEALING THE PORTIONS OF THE ROCK TUNNE <br /> THAT CROSS THE CUZZETTE, ROLLINS, AND MIDDLE SANDSTONES TO PREVENT <br /> FUTURE MIXING OF WATERS IN THESE AQUIFERS AND SHALL INCLUQE �� <br /> SPECIFICATIONS FOR SEALING THE ADITS TO PREVENT GROUND WATER FROM 6 7 <br /> F WING FROM THE RUCK TUNNEL ONTO THE SURFACE. 0&t ' <br /> (Cumulative Ground Water Imoacts <br /> C`e ,+S 'D ring this five-year permit period, the impacts of the Sunlight Mine,the North Thompson Creek Mines and the Coal Basin ,`lines on ground water / <br /> quality and quantity will be localized in areas aajacent to the mine. I <br /> During the life of the North Thompson Creek .lines and the Coal Basin <br /> Mines, the areas affected by these mines will eventually join. When <br /> tnese two mines eventually join, .the North Thompson Creek and Coal basin <br /> -nines will 'both impact the ground water in the aquifers in the Coal Creek <br /> Basin. The Sunlight MMine Nill not produce a cumulative ground water <br /> impact with any other mine in the Roaring Fork Drainage during its <br /> l ife-of-mine. <br />