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<br /> <br />1 <br /> <br /> <br />1 <br />1 <br />1 <br /> <br /> <br />1 <br /> <br />1 <br /> <br />1 <br /> <br />1 <br />1.) The refuse material is separated from the useable coal by <br />means of a wet floatation type of process. <br />2.) Depending on the material encountered during the mining <br />operation, the refuse material can range from crushed <br />hard rock to decomposed claystones and shales. <br />3.) The material is hauled wet from the separation plant b}• <br />10-CY end dump trucks and placed in spoil piles on top of <br />the relatively flat surface of the refuse pile. <br />4.) The pattern of dumping generally seems to consist of <br />dumping spoil piles in a somewhat linear row from the <br />rear of the pile to the face. <br />5.) The spoil piles are then graded flat and compacted to a <br />lift thickness of approximately 2-feet wit:: a ~o~er. <br />Because of the wide variability of refuse materials it seems likely <br />that appro:imately horizontal zones of either relatively high or <br />low permeability material could be created. The extent of these <br />=ones would depend on the amount of that type of material <br />encountered in the mining operations. Additionally, because the <br />spoil piles are placed in a pattern from the rear to the face of <br />the pile, it is conceivable that overlapping piles of relatively <br />pervious material might create somewhat lengthy permeable charnels <br />trending in the same direction as the sequence of spoil pile <br />placement. Again, if the amount of pervious material placed in <br />consecutive loads is relatively small, the channels could be <br />bounded by substantially less permeable materials. Where such <br />channels would connect, a network of water paths would be created. <br />The manner of deposition of the natural alluvium underlying the <br />pile would also likely have resulted in layers and channels varying <br />widely in permeability. The conditions described above for <br />deposition of the natural alluvium comprising the pile foundation <br />and for the placement of the refuse material in the pile cou'_d <br />potentially create confined and pressurized aquifers consisting c`_ <br />either layers or channels. Some evidence of such aquifers has bee: <br />seen. The following observations confirm the existence of confined <br />lavers and channels: <br />1. ) The surface _::pressions of seepage which ca. be s.. _.. o <br />the slope of both refuse piles appear to indicate the <br />combination of both of these effects described above. <br />While the seepage daylight points seem to lie generally <br />along appro:imately horizontal trends, they are also <br />isolated and limited in extent, occupying a horizonta'_ <br />distance typically less than 20 to 30-feet. <br />2.) As was previously discussed, 5 holes were drilled within <br />20-feet from original well ?-1, three o`_ which <br />encountered the zone which controls the water level in <br />P-1 and two which did not penetrate that zone. <br />15 <br />