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Based upon the observed flows in the two mines, it appears that the <br />majority of the inflow is coming from dewatering of the coal beds. <br />Additional flows are coming from fault zones, and to a lesser extent from <br />pillared areas of the mines. Because water level declines are being <br />observed in the aquifers overlying (and underlying) the mines, it can be <br />assumed that some of the inflow to the mines is from these aquifers. <br />However, it is not possible to determine whether the sandstone aquifer <br />water is reaching the mine through faults or through general seepage <br />through the mine top and/or bottom. <br />The water quality data for the fault zone inflow in the No. 5 Mine <br />(Table III-18) indicates that the water is of virtually identical <br />chemistry to the rest of the mine inflow. Therefore, it is unlikely that <br />• the source of inflow is directly from sources other than bedrock units, <br />which exhibits markedly different chemistry from the mine inflow water. <br />3.4.7.2 Predicted Inflows <br />/ Ground water inflow analyses were performed on the No. 5, No. 9 and <br />/ "E" Seam access inflows. An additional analysis was also performed on the 2 <br />West Main inflow in the No. 5 Mine. The projected mine inflows were made <br />assuming an aggressive mining sequence in both mines with completion of <br />all mains in the No. 5 Mine in 1984, completion of all mains in the No. 9 <br />/ Mine by 1988, and completion of the "E" Seam access by 1987 (one year <br />/ construction period). Less aggressive mining sequences would produce <br />smaller maximum inflows for the mines. <br />(REV. 2/14/86) <br />III-70 <br />