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-7- <br />Average <br />• Location Water Level Elevation Average pH <br />P-1 9.7 6,316.7 <br />P-2 8.7 6,316.9 <br />P-3 10.9 6,317.9 <br />P-4 31.6 6,322.9 <br />Mine Water <br />Average <br />Conductivity <br />@ 25 C <br />The mine inflows were monitored for flow and field during this <br />period on a monthly basis. Seven sites were monitored at the beginning <br />of the period; three more were added during the year. A review of <br />the data reveals three distinct types of inflow: inflow through the <br />coal seam from the outcrop-subcrop, inflow updip from the coal seam, <br />and inflow through portions of the old mine. <br />• Sample points UG-1 through UG-4 and UG-7 are inflow downdip <br />through the coal seam or the immediate roof from the outcrop-subcrop. <br />This water is likely to have come through the coal seam from ground <br />water with quality similar to that of alluvial wells A-1 through A-3. <br />The average flow, pH ,and conductivity are shown on Table t4-83. UG-1 <br />shows a seasonal variation, which may, however, be due to evaporation <br />rather than actual inflow variation. UG-2 and -3 show inflows generally <br />associated with a roof fall. Roof falls occurred at cross-cuts 11+60 <br />and 12+40 in the spring of 1983, not long after the flow from UG-2 and <br />UG-3 dropped off. These falls now contribute to UG-7. Water in the <br />immediate roof is a typical cause of roof falls, possibly due to the <br />extra weight of the saturated rock. No pattern has been established <br />to determine why spot locations in the roof become saturated. The flow <br />from UG-4 has reduced slightly. The pH of these five sites is close, <br />but the conductivity varies somewhat. The variation in conductivity <br />may be proportional to the length of flow through the coal seam. <br />. Sample points UG-5, upper and lower, and UG-9 are locations where <br />mine inflows travel through old portions of the mine. The flow through <br />