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calculations The time frame for baeeltne conditions to listed under 'r_ondrtions <br /> specaf red" a[ [he bottom of each page. This is followed by a plot of TDS versus time for <br /> the entire period of record. The regression line on this plot is generated by a method <br /> known ere LOWESS (Locally Weighted Scatter plot Smoothing). A smoothness factor of 1 lon a <br /> scale of 0 to 3) was used, which gives mazimum smoothing. Finally, this plot is followed <br /> by a table lis [rng hlstorrc TDS values and percent mxlliequi valents for ma]or tons. <br />- Alluvium. Three wells monitor the Hubbe rson Glil ch alluvium. Well WHAL6-2 is upstream <br />of mine discharges. Its TDS plot shows a stable trend since 1989. This is lakely due to <br />the fact that this pasture has been irrigated stazting in 1989. Well WFIA1.7-2 exists on <br />Hubberson Gulch downstream of mine discharges from NPDES 006. Its TDS plot shove a slight <br />increasing trend. Well WHAL10 exists on 006 Gulch (a eubberson Gulch tributary) below <br />NPDES 006. TDS values at thrs wall display an increasrng trend. <br />One well monrtors the 005 Gulch alluvium (tributary to Dzy Creek). This well, WDAL11, is <br />normally dry. <br />Severn tells moor [ot the Sage Creek alluvium. Well WSAL12 is located on Sage Creek <br />ad]acent to Surface Water Site FG4 and ie downstream of all potential mine discharges. <br />TDS values at this well have been increasing since it was drilled in 1990. Nell WSAL13 is <br />located below NPDES 009 on the northern Saga Creek tributary (this NPDES sate started <br />flowing for the first time ever in 1996) . It displays a decreasing TDS trend. Well <br />WSALl< exists on the southern Sage Creak trabu Gary below the proposed NPDES 015 pond III-W <br />South Expansion azea). Honi toting tae resumed at this well in Nay 199E after being <br />discontrnued in Oetober 1995. This wall, so far, hen not been impacted by mining. Walls <br />YSAL1, 3, 8, and 17 are also part of SCC's Yoaet Mine monitoring network and are all <br />upstream of Seneca II-W. Since no mine related discharges from Yoaet have yet occurred at <br />Sage Creek, TDS values at these four wells are a result of natural conditions. <br />in the Probable Hydrologic Consequences section (PHC, Tab 17) of the Seneca II-W PAP, <br />predictions were made for the June-September average TDS values at vazioue alluvial cells. <br />In the eubberson Cinch alluvium at Well WHAL7-2, a value of 1299 mg/1 was predicted, while <br />a value of 1G50 mg/1 was observed true yeaz. In the 006 Gulch alluvium at Well WEN.10, a <br />value of 3390 mg/1 was predicted, rhile a value of 2520 my/1 tae observed this yeaz. In <br />the Sage Creek alluvium at Well WSAL12, a value of 972 mg/1 tae predicted, while a value <br />• of 770 mg/1 was observed this year <br />5 <br />