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. versus time for the entire period of record. The regression line on <br />this plot is generated by a method known as LOWESS (LOcally WEighted <br />Scatterplot Smoothing). Unless otherwise noted, a smoothness factor <br />(SF) of 1.0 (on a scale of 0 to 1) was used, which results in maximum <br />"smoothing". Finally, this plot is followed by a table listing historic <br />TDS values and percent milliequivalents for major ions. <br />- Alluvium. Well 32 is located furthest upstream on Little Grassy <br />Creek. Review of the TDS plot (SF 0.5) indicates an overall increasing <br />trend. Further downstream, well 6 displays an increasing TDS trend. <br />Furthest downstream on Little Grassy Creek and below NPDES 002, is Well <br />31A. 2t also displays an increasing TDS trend. <br />Three wells are sampled in the Grassy Creek alluvium. Well 71 monitors <br />the alluvium upstream of mining at Seneca II. It displays an increasing <br />TDS trend. Well 33 monitors the Grassy Creek alluvium at the Little <br />• Grassy Creek confluence. It displays an increasing TDS trend. Well 70 <br />monitors the alluvium below Seneca II and also downstream of the <br />confluence with Scotchmans Gulch. It displayed a decreasing TDS trend <br />until May 2003, then an increasing trend till May 2005, and finally a <br />decreasing trend since then. <br />In the Cow Camp Creek alluvium (below NPDES 004), water quality is <br />measured at two wells. Well 46 displays a varying TDS trend (SF 0.5), <br />rising and falling for no apparent reason. Since 1999, the trend has <br />been stable. Well 69, located below 46, overall displays a decreasing <br />TDS trend, although the trend has been generally stable since 1997. <br />Well 68, completed in the Bond Creek alluvium (below NPDES 008), was <br />drilled along with Well 69 (see above) in 1988. Recently, it displays a <br />stable TDS trend (SF 0.5). <br />- Wadge Overburden. Well 42, located in the south central part of the <br />permit area, usually does not have enough water in its casing to sample, <br />as was the case this year. Milliequivalent data and the TDS plot from <br />previous samples have been included in Appendix C. <br />5 <br />