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-8- <br />i the old mine seems to affect the water adversely. The inflow for UG-9 <br /> is surface water on the north end of our surface disturbance boundary, <br /> which soaks into the mine due to shallow cover, and minor amounts of <br /> surface water that flow into the portal. This water is pumped into <br /> the major part of the old mine to reduce the suspended solids <br /> associated with the travelway it crosses. UG-5 (upper) is the point of <br /> discharge of old mine water. Due to its changes after flowing to the <br /> sump on the mine floor, UG-5 is the same water monitored at the end of <br /> the 1 North Mains. Flow into this mine is assumed to be surface and <br /> ground water from an area of shallow cover on the east side of the mine. <br /> This inflow is proportional to irrigation run-off over this area. <br /> Spring it4 probably contributes to this inflow. The flaw from UG-9 <br /> contributes an estimated 0.2 gpm to the flow of UG-5. The flow from <br /> UG-5 has been manually regulated since August, 1982, when a hole was <br /> drilled into the old mine and a valve installed. Total flow was cal- <br /> culated from the flow rate times the length of time flowing. The low <br /> pH of UG-5 (upper) and UG-9 may be a function of flow through caved roof <br />• material that is normally separated from the water. The pH of UG-5 <br /> (lower) must be affected by its exposure to air or its flow path on <br /> the floor, possibly through rock dust on the floor. The pH of other <br /> samples may be affected in a similar fashion, because they have flowed <br /> some distance on the floor prior to sampling. The conductivity of <br /> these samples is higher than expected from inflows from the outcrop- <br /> subcrop. Again, this is likely to be due to roof fall material not <br /> normally in the flowpath of this type of water. <br />The only location where water flowing updip is checked is in the <br />7 and 8 North panels. This water has been allowed to build up in <br />8 North with little pumping being done. Flows are estimated to be <br />1-2 gpm. The pH is consistant with other mine water, but the conduc- <br />tivity is higher. The conductivity is higher than expected when it is <br />compared to the E-1 coal seam well water quality. <br />• All of the mine inflows are drained or pumped to the main sump <br />where UG-6 sampling is done. Total discharge from the mine is through <br /> <br />