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GROUND WATER MONITORING <br />Bedrock <br />' Wells in the Wadge Overburden (which includes the Wadge Coal), overlying Twentymile <br />Sandstone, and underlying Trout Creek Sandstone are monitored in the mine site azea. Three <br />' ~ ~ Trout Creek wells are monitored for water level and water quality and one well is monitored for <br />n`~ water level only. Four Wadge Overburden we(l'ls and two Twentymile Sandstone wells aze <br />' /\` monitored for water level and water quality. ~ -li(?~~~ ~oa~i~ m,(~ <br />' Water Levels -Water levels in the Trout Creek Sandstone are plotted on Figures 3 through 6. <br />The plot of the data for Well 001-83-106 indicates that it is frequently pumped. None of the <br />' plots indicate any long term trend in water level. Present mine inflow do not indicate any <br />significant contributions from the Trout Creek Sandstone; therefore, no impact on the aquifer <br />is likely to have occurred. Plots of water levels in the two Twentymile Sandstone wells aze <br />presented on Figures 7 and 8. They do not indicate any pattern that might be related to impacts <br />' from underground mining. <br />' Water levels in Wadge Overburden aquifer wells 009-79-4 (Figure 9) and 006-82-41C (Figure <br />~ 10) have been measured since 1982. The data indicates a relatively stable water level in the <br />,1/ two wells since underground mining began. The water level in Wells 006-87-1 (Figure 11) and <br />(~; <br />O~ ~ 0062 (Figure 12) indicate significant impact from the nearby underground mining. The data <br />' ~ fo Well 006-87-1 (Figure 11) indicates that it has been significantly effected by underground <br />' ~ mining. In 1988 the water level declined more than 400 feet and the well apparently went dry. <br />However, in 1990 the water level in the well began to recover. It appeazs that the water level <br />' ~ in Well 006-88-2 will follow a similar pattern. The data indicates that the water levels in the <br />Wadge overburden vary seasonally: the water levels in the summer aze higher than in the <br />' winter. No such trend was observed in the Twentymile Sandstone. <br />The water quality data for the three Trout Creek Wells does not indicate any water quality <br />1 <br />-3- <br />