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program may be found on pages 7-336 to 7-355 of the Seneca II PAP, and <br />is summarized on pages 7-341/342. <br />The following discussion of the analytical data collected during the <br />reporting period is arranged by strata being monitored and coincides <br />with the format (by aquifer type) in which the analytical data are <br />presented in Appendix C. The discussion of water quality will be <br />limited to a description of total dissolved solids (TDS) concentrations. <br />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. 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. TDS values are now increasing at Well 70. <br />6 <br />