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- Alluvium. Three wells monitor the Hubberson Gulch alluvium. We11 <br />WHAL6-Z is upstream of NPDES 006 but downstream of NPDES 016, which <br />began disch arging in 2001. Its TDS plot shows a slightly increasing <br />trend. This may be due to the fact that this pasture has been irrigated <br />starting in 1989. Well WHAL7-2 exi sts on Hubberson Gulch downstream of <br />mine discharges from NPDES 006 and 016. Its TDS plot shows an increasing <br />trend. Well WHAL10 exists on 006 Gulch (a Hubberson Gulch tributary) <br />below NPDES 006. TDS values at this well display an increasing trend. <br />One well monitors the 005 Gulch alluvium (tributary to Dry Creek). This <br />well, WDAL11, is normally dry. <br />Three wells monitor the Sage Creek alluvium- Well WSAL12, located on <br />Sage Creek adjacent to Surface Water Site SW-S2-FG4 (WSSF3), is <br />downstream of all mine discharges on Sage Creek. TDS values at this well <br />had been increasing since it was drilled in 1990, but have leveled off <br />since 1996. Well WSAL23 is located below NPDES 009 on the northern Sage <br />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 on increasing 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 1420 <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 2310 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 650 mg/1 was observed this <br />year. <br />~I <br />6 <br />