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The May-September average TDS value measured this year at Well WHAL7-2 <br />was 1420 mg/1, while the predicted value was 1299 mg/1. The value <br />observed was determined gravimetrically (i.e., dry a water sample and <br />weigh the residue). According to Hem (1989, pg. 157), ... it is not <br />uncommon for water high in calcium and sulfate concentrations to yield a <br />residue after drying an hour at 180°C that exceeds the computed <br />dissolved solids by several hundred milligrams per liter" and also, "In <br />many instances, especially if the concentration is greater than 1000 <br />mg/1, the calculated dissolved-solids value may be preferable to the <br />residue-on-evaporation value". The calculated dissolved solids value is <br />determined by adding up all the concentrations for all of the various <br />dissolved constituents. For May-September 2001, the calculated TDS <br />average value is 1390 mg/1. Drought conditions probably have contributed <br />to the elevated TDS values. <br />- Wadge Overburden. Four wells monitor the Wadge overburden. Well WOV14 <br />exhibits an increasing TDS trend. At Well WOV16, the limited at so far <br />indicates an increasing TDS trend. Only eleven samples have been <br />collected so far for We11 WOV16, all of them after mining began, and <br />until recently there was normally not enough water to sample. In October <br />2001, there again was not enough water to sample at this well. Well <br />WOV17 exhibits an increasing TDS trend, however TDS values have <br />decreased since 1998. Well WOV4-1 (II-W South Expansion area) was <br />sampled for the first time ever in May 1999. This well has been dry <br />since then. <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 4295 mg/1 was observed this year. For Well WOV17, a <br />value of 4295 mg/1 was predicted, while a value of 8240 mg/1 was <br />observed this year. <br />The predicted value for Well WOV17, 4295 mg/1, was predicated on a 5.5~ <br />increase of the premining value of 4072 mg/1, which is an average of <br />several overburden wells. However, Well WOV17 exhibited a premining TDS <br />average value of 8043 mg/1, while the next highest TDS Wadge overburden <br />7 <br />