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- Wadge Overburden. Four wells monitor the Wadge overburden. Well WOV14 • <br />exhibits an increasing TDS trend. Well WOV16 previously displayed an <br />increasing TDS trend. Prior to October 1994, there was not enough water <br />to sample in this well. Therefore, all samples represent postmining <br />conditions (mining began in this area in 1990) . Since May 2005, there <br />again was not enough water to sample in this well. Well WOV17 exhibits <br />a decreasing TDS trend (SF=0.5), with TDS values decreasing since 1998. <br />A new Wadge overburden well, WOV25, was drilled in September 2004. <br />The Seneca II-W PHC predicts annual average TDS values at various Wadge <br />overburden wells. For Well WOV14, a value of 4385 mg/1 was predicted, <br />while a value of 4040 mg/1 was observed this year. <br />For We11 WOV17, a value of 4295 mg/1 was predicted, while a value of <br />8200 mg/1 was observed this year. The predicted value for Well WOV17 was <br />predicated on a 5.5$ increase of the premining value of 4072 mg/1, which <br />is an average of several overburden wells. However, Well WOV17 exhibited <br />a premining TDS average value of 8043 mg/1, while the next highest TDS <br />Wadge overburden well (WOV15) had a baseline TDS average of 3741 mg/1. <br />Well WOV17 also exhibited a high degree of baseline TDS variability <br />(min. = 6860, max. = 8586 mg/1). The average TDS value this year, 8200 <br />mg/1, was below the PHC prediction using the average baseline value <br />(8043 + 5.5~ = 8485 mg/1), and is also below a 5.5~ increase of the <br />maximum baseline TDS value (8586 + 5.5~ = 9058 mg/1). Also, as explained <br />previously in the alluvium section, calculated TDS values are often <br />preferable to measured TDS values. The calculated TDS average value this <br />year was 7095 mg/1. More data will be needed to evaluate the long-term <br />TDS trend, however the peak TDS value occurred in 1998. <br />- Wadge Coal. Four wells monitor the Wadge coal seam. Well WW19 <br />exhibits a stable TDS trend (SF=0.5), with TDS values peaking in 2001. <br />We11 WW16 has not had enough water in it to sample since May 1999, ano <br />has been dry since October 2004. In past years it displayed an <br />increasing TDS trend. Well WW17 exhibits a nearly level TDS trend. We11 <br />WW25 exists in the II-W South Expansion area. It was drilled in <br />September 2004. <br />8 <br />