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' approximately 900 mg/l in 1982 and 1983 to almost 1, 400 mg/l in <br /> 1986, and then decreased to 1, 000 mg/l since 1987 . The trend of <br /> ' increasing dissolved solids appears to have leveled off. No other <br /> significant change in water quality was observed. No violations <br /> of the NPDES permit for the #1 Strip Pit Discharge were detected <br /> in 1989. <br /> ' IMPACTS AND FUTURE MONITORING <br /> ' No significant unpredicted adverse impacts were detected in 1989. <br /> A slight long-term increase in the dissolved solids in the Williams <br /> Fork Alluvium wells, especially Wells AVF-3 and AVF-5, was <br /> observed. The cause of this increase is unknown; however, the data <br /> ' indicates that it is not from the mine discharge. <br /> Water levels in the Trout Creek Sandstone are falling. This is due <br /> to usage by the mining operation, as the primary water supply well <br /> is completed in the Trout Creek Sandstone. All of the wells in the <br /> Middle Sandstone had falling water levels. This was due to the <br /> impacts of longwall mining and climatic effects. A small decrease <br /> ' in the water levels in the Twentymile Sandstone was also observed, <br /> and was probably due to climatic effects. <br /> 1 <br /> 1 <br /> 1 <br /> 1 <br /> ' -5- <br />