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Creek tributary (this NPDES site, constructed in 1991, started flowing <br />for the first time ever in 1996). This well displays an increasing TDS <br />trend. Since October 2001, there has not been enough water to sample in <br />this well. Well WSAL14 exists on the southern Sage Creek tributary below <br />NPDES 015 (constructed in August 1999, first flow February, 2000). <br />Monitoring was resumed at this well in May 1998 after being discontinued <br />in October 1995. It displays a stable TDS trend. <br />In the Probable Hydrologic Consequences section (PHC, Tab 17) of the <br />Seneca II-W PAP, predictions were made for the May-September average TDS <br />values at various alluvial wells. In the Hubberson Gulch alluvium at <br />Well WHAL7-2, a value of 1299 mg/1 was predicted, while a value of 1475 <br />mg/1 was observed this year. In the 006 Gulch alluvium at Well WHAL10, a <br />value of 3394 mg/1 was predicted, while a value of 2620 mg/1 was <br />observed this year. Zn the Sage Creek alluvium at Well WSAL12, a value <br />of 972 mg/1 was predicted, while a value of 705 mg/1 was observed this <br />year. <br /> <br />The May-September average TDS value measured this year at Well WHAL7-2 <br />was 1475 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 20D3, 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 thirteen samples have been <br />7 <br />