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A separate section, Comparison of Ground Water Quality to Water Use <br />Standards, will discuss any samples that exceed water use standards. <br />Data for each well in this appendix begins with a listing of the water <br />quality data collected during the past two years, followed by remarks <br />explaining the sampling procedure. This is followed by a plot of TDS <br />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. However, TDS values have stabilized since 1998. Further <br />downstream, Well 6 displays an increasing TDS trend. Furthest <br />downstream on Little Grassy Creek and below NPDES 002, is Well 31A. It <br />also displays an increasing TDS trend. <br />Three wells are sampled in the Grassy Creek alluvium. We11 71 monitors <br />the alluvium upstream of mining at Seneca II. It displays an increasing <br />TDS trend. We11 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. TDS values are now increasing at Well 70. <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 decreasing. Well 69, located below 46, overall displays a <br />decreasing TDS trend, although values have generally increased since <br />1997, <br />u <br />7 <br />