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1 ' declined since 1982 (see Figure 27). It appears that this spring ' may have been fed by seepage from the now abandoned discharge ditch from the No. 9 Mine. The spring is no longer a significant discharge point. ' Water Quality ' The summary of the water quality data for the spring is presented in Tables 32 and 33. A plot of dissolved solids for the No. 1 Strip Pit is presented in Figure 28. it indicates that the dissolved solids level of the discharge has increased from an ' average of approximately 900 mg/1 in 1982 and 1983 to almost 1,400 mg/1 in 1986 and then decreased to 1,100 in 1987 and 1988. As the dissolved solids increased, the flow rate has decreased; therefore, ' the total salt loading has not significantly changed. Also, this trend of increasing dissolved solids appears to have leveled off. No other significant change in water quality was observed. No ' violations of the NPDES permit for the No. 1 Strip Pit Discharge were detected in 1988. ' IMPACTS AND FUTURE MONITORING The discharge rate from the No. 1 Strip Pit has .continued to fall ' considerably below historic values. No significant unpredicted adverse impacts were detected in 1987. A slight long-term increase in the dissolved solids in the Williams Fork Alluvium wells, especially wells AVF-3 and AVF-5, was observed. The cause of this ' increase is unknown; however, the data indicates that it is not from the mine discharge. ' Water levels in the Trout Creek Sandstone appear to be falling. This may be due to usage by the mining operation as the primary water supply well is completed in the Trout Creek Sandstone. Most ' of the wells in the Middle Sandstone had constant or rising water levels. However, one well with declining water levels appears to be affected by the nearby longwall mining. 1 6 1