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• seepage both appear to have some influence on the Strip Pit discharge, as the discharge <br />dropped to just a few gpm from January through May with a small peak in March <br />coinciding with spring runoff. <br />WATER QUALITY <br />The summary of the water quality data for the spring is presented in Tables 34 and 35. A <br />plot of dissolved solids for the #1 Strip Pit is presented in Figure 29. It indicates that the <br />dissolved solids level of the discharge has increased from an average of approximately <br />900 mg/I in 1982 and 1983 to almost 1,400 mg/I in 1986, and then decreased to <br />approximately 1,100 mg/I since 1987. <br />PONDS <br />• The associated data is located in the data listings section of the report. <br />HYDROLOGIC IMPACTS <br />No significant unpredicted adverse impacts were detected during 1994. The continued <br />drawdown in the Middle Sandstone unit is determined to be the most significant impact <br />related to mining operations associated with Mines 5 and 6. The Probable Hydrologic <br />Consequences section of the Permit predicted drawdown in the Middle Sandstone unit <br />associated with mining the F and E coal seams at Mines 5 and 6, although the extent and <br />magnitude of the drawdown were not quantified. A worst case evaluation was, however, <br />prepared for the overlying Twentymile Sandstone. The drawdown in Middle Sandstone <br />Well TR-4 attributable to the longwall mining in the E and F seams at a distance of <br />• <br /> <br />