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<br />' WATER QUALITY <br />' The summary of the water quality data for the spring is presented <br />in Tables 34 and 35. A plot of dissolved solids for the pl Strip <br />Pit is presented in Figure 29. It indicates that the dissolved <br />' solids level of the discharge has increased from an average of <br />approximately 900 mg/1 in 1982 and 1983 to almost 1,400 mg/1 in <br />1986, and then decreased to less than 1,000 mg/1 since 1987. At <br />the end of 1990 the iron concentration increased dramatically. The <br />' apparent increase in iron was found to be due to a sampling error <br />caused by frozen conditions. Samples collected currently in 1991 <br />showed much lower iron concentrations. <br />' PONDS <br />' Sediment Ponds HR-P1B (NPDES No. 004) and 9A-P1 (NPDES No. 018) <br />each discharged once during the spring. The volume of discharge <br />is not significant to the hydrologic balance and the water quality <br />(Table 36) was very good. <br />IMPACTS AND FUTURE MONITORING <br />' No significant unpredicted adverse impacts were detected in 1990. <br />A continued increase in the dissolved solids in Williams Fork <br />' Alluvium well AVF-3 was observed. The cause of this increase is <br />unknown; however, the data indicates that it is not from the mine <br />discharge. <br />' All of the wells in the Middle Sandstone had falling water levels. <br />This was due to the impacts of longwall mining and climatic <br />effects. <br /> <br /> <br />1 <br /> <br />1 <br /> <br />-5- <br />