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• The pit should decrease heads in the aquifer near it and if it changes the flow direction, it should be from <br />the well toward the pit, not toward well GA-1. The increase in iron concentration in other wells has shown <br />a significant fluctuation also, and therefore this variation is probably natural. <br />Concentrations in wells GA-3 (Q and R aquifer) and G&5 (H and I aquifer) have not demonstrated <br />significant changes. The TDS concentration in well G&5, an H and I aquifer well, has decreased slightly <br />since the start of mining. <br />The sulfate and TDS concentrations in the Twentymile Sandstone well, GD-1, have decreased slightly. <br />The remainder of the constituents have been similar to baseline results. <br />The GE wells are located in the northwest part of the Trapper Mine permit area (see Map M52 for <br />location). Groundwater in the area of both the Ashmore and Derringer Pits could flow toward the GE <br />sites. Very high concentrations of iron have been observed in well GE-1 (Q and R aquifer) and the <br />values (120 mg/I on 7/14/80) have steadily increased since the start of mining. A ma>amum value of 14. <br />mg/I was observed prior to mining. The Q and R coal seams are mined in the Derringer Pit and were <br />mined in the now inactive Cott Pit. The old Empire Energy Pit is also located in this area. Some of the <br />iron concentration increase could be a natural variation, but it is doubtful the total Increase is attributable <br />to natural fluctuations. Some increase in manganese has been observed in Well GE-1, while sulfate <br />concentrations have fluctuated. <br />Increases in copper and lead concentrations have been observed in well GE-2. This well is completed in <br />the H and I aquifer, which the Ashmore Pit is mining. Manganese and sulfate concentrations <br />de strafed a slight increase. Monitoring of well GE-3, which is completed in the F coal seam nd the <br />sandstone be o as shown some increase in lead. The F coal seam has not been penetrated by any o <br />• e pits. The sulfate and TDS concentrations in this well have decreased. <br />0 <br />4-233 <br />Pe-q <br />.. MAY 13 1998