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preferable to the residue-on-evaporation value". The calculated <br />dissolved solids value is determined by adding up all the concentrations <br />for all of the various dissolved constituents. For May-September 2009, <br />the calculated TDS average value is 1303 mg/1. However, as previously <br />noted, the upstream Well WHAL10 has TDS values below its predicted <br />value. Also, the GWPOC well for the Dry Creek Alluvium, DCAL-02, did not <br />exceed the TDS GWPOC standard, 3195 mg/1. <br />- Wadge Overburden. Three wells monitor the Wadge overburden. North <br />area Well WOV14 exhibits an increasing TDS trend. Middle area Well WOV17 <br />overall exhibits a decreasing TDS trend, but with an unusually high <br />values the last two years. South area Well WOV25 was drilled in <br />September 2004. It displays an increasing TDS trend. <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/l was predicted, <br />while a value of 4390 mg/l (4100 mg/l calculated) was observed this <br />year. <br />For Well WOV17, a value of 4295 mg/l was predicted, while a value of <br />7410 mg/l was observed in 2007. 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/l, while the next highest TDS <br />Wadge overburden well (WOV15) had a baseline TDS average of 3741 mg/l. <br />Well WOV17 also exhibited a high degree of baseline TDS variability <br />(min. = 6860, max. = 8586 mg/1). The TDS value in 2007, 7410 mg/1, was <br />below the PHC prediction using the average baseline value (8043 + 5.50 = <br />8485 mg/1), and is also below a 5.5% increase of the maximum baseline <br />TDS value (8586 + 5.5% = 9058 mg/1). Also, as explained previously in <br />the alluvium section, calculated TDS values are often preferable to <br />measured TDS values. The calculated TDS value in 2007 was 6725 mg/l. In <br />2008 and 2009, unusually high TDS values of 16,700 and 14,300 mg/l were <br />observed at this well. These values are over twice the historic . <br />average, 7736 mg/l, for this well. The water type shifted from a CaMgNa- <br />S04 type in 2007, to a Mg-S04 type in 2008 and 2009. No significant <br />6