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1 <br />1 <br />GROUND WATER MONITORING <br /> Bedrock <br />' Wells in the Wadge Overburden (which <br />il <br />T <br />S <br />d <br />d <br />d <br />l includes the Wadge Coal), <br />d <br />T <br />C <br />k S overlying <br />d <br /> wentym <br />an <br />e <br />stone, an un <br />er <br />ying ree <br />rout <br />an <br />stone are monitore <br />. <br /> Three Trout Creek wells are monitored for water level and water q uality and <br />' one well is monitored for water level only. Four Wadge Overburden wells and <br /> two Twentymile Sandstone wells are monitored for water level and water <br />' quality. <br />Water levels - There is insufficient period of record to plot any of the <br />Trout Creek water level data or draw any conclusions from the limited data. <br />' Present mine inflow do not indicate any significant contributions from the <br />Trout Creek Sandstone; therefore, no impact on the aquifer is likely to have <br />occurred. Plots of water levels in the two Twentymile Sandstone wells are <br />' presented on Figures 2 and 3. They do not indicate any pattern that might <br />be related to the effects of underground mining. <br /> <br />1 <br /> <br /> <br />1 <br /> <br />1 <br />1 <br />1 <br />1 <br />Water levels in Wadge Overburden aquifer wells 009-79-4 (Figure 5) and <br />006-82-48 (Figure 6) have been measured since 1982. The data indicates a <br />relatively stable water level in the two wells since underground mining <br />began. No impact from underground mining is evident in the water level <br />data. The casing is partially collapsed in well 006-82-48A and the water <br />level data may be suspect. This well is to be replaced in 1988. The data <br />indicates that the water levels in the Wadge overburden vary seasonally: <br />the water levels in the summer are higher than in the winter. No such trend <br />was observed in the Twentymile Sandstone. <br />Water Quality - Water quality data from Trout Creek well 001-83-106 1s <br />summarized on Table 4. Insufficient data is available from the other Trout <br />Creek Wells for proper analysis. The water in the aquifer has a dissolved <br />solids concentration of approximately 870 mg/1 and is a sodium bicarbonate <br />type. Trace metal levels are low and no impact from mining is evident. <br />Well 001-83-106 is used for water supply. <br />-3- <br />