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<br /> mg/1 was observed this year . In the 006 Gulch alluvium at Well WHAL10, <br /> a value of 3394 mg/1 was predicted, while a value of 2760 mg/1 was <br /> observed this year. In the Sage Creek alluvium at Well WSAL12, a value <br /> of 972 mg/1 was predicted, while a value of 655 mq/1 wa s observed this <br /> year. <br />The May-September average TDS value measured this year at Well WHAL7-2 <br />was 1405 mg/l, while the predicted value was 1299 mg/1. The~1405 mg/1 <br />value was determined gravimetrically (i.e., dry a water sample and weigh <br />the residue). According to Hem (1989, pg. 157~~, ... it is not uncommon <br />for water high in calcium and sulfate concentrations to yield a residue <br />after drying an hour at 180°C that exceeds the, computed dissolved solids <br />by several hundred milligrams per liter" and also, "In many instances, <br />especially if the concentration is greater than 1000 mg/1, the <br />calculated dissolved-solids value may be preferable to the residue-on- <br />evaporation value". The calculated dissolved solids value is determined <br />. by adding up all the concentrations for all_ of the various .dissolved <br />constituents. For May-September 2001, the calculated TDS ave rage value <br />is 1310 mg/1, which is only slightly above the PHC predicted value. <br />- Wadge Overburden. Four wells monitor the Wadge overburden. Well <br />WOV14 exhibits an increasing TDS trend. At Well WOV16, the limited at <br />so far indicates an increasing TDS trend. Only eight samples have been <br />collected so far for Well WOV16, all of them after mining began, and <br />until recently there was normally not enough water to sample. In <br />October 2000, there again was not enough water to sample at this well. <br />Well 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 2000. This year, this well was <br />dry. <br />The Seneca II-W PHC predicts annual average TDS values at various Wadge <br />overburden wells, For Well WOV19, a value of 4385 mg/1 was predicted, <br />while a value of 3870 mg/1 was observed this year. Fox Well WOV17, a <br />. value of 4295 mg/1 was predicted, while a value of 8450 mg/1 was <br />observed this year. <br />7 <br />