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For Well WOV17, a value of 4295 mg/1 was predicted, while a value of <br />7795 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. = 6660, max. = 8586 mg/1) The average TDS value this year, 7795 <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 S.Sa increase of the <br />maximum baseline TDS value (6586 + S.5g = 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 7130 mg/1. More data will be needed to evaluate the long-term <br />TDS trend, however the peak TDS value occurred in 1998, and are now <br />decreasing. <br />- Wadge Coal. Four wells monitor the Wadge coal seam. Well WW14 <br />recently exhibits a stable TDS trend (SF=0.5), with TDS values peaking <br />in 2001. Well WW16 has not had enough water in it to sample since May <br />1999, and has been dry since October 2004. In past years it displayed an <br />increasing TDS trend. Well WW17 exhibits a nearly level TDS trend. Well <br />WW25 exists in the II-W South Expansion area. It was drilled in <br />September 2004. TDS values at this well display an increasing trend. <br />The Seneca II-W PHC predicts an annual average TDS value o£ 2630 mg/1 <br />for Well WW14, while a value of 4490 mg/1 (4055 mg/1 calculated) was <br />observed this year. For Well WW17, a value of 3002 mg/1 was predicted, <br />while a value of 645 mg/1 was observed this year. <br />As noted in the previous paragraph, Well WW14 experienced this year a <br />TDS exceedence of the PHC prediction. This prediction was based on <br />several assumptions. 1) Baseline water quality values were an average of <br />all Wadge coal wells at Seneca II-W. 2) Aquifer characteristics were an <br />average of all Wadge coal wells at Seneca II-W. 3) The Wadge coal seam <br />was saturated for its entire thickness (11.8 feet). <br />8 <br />