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- Alluvium. Well 32 is located furthest upstream on Little Grassy <br />Creek. Review of ~~.he 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 .t3 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 ;;cotchmans Gulch. It interestingly displays a <br />decreasing TDS trend. <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 October 2001, the <br />trend has been stable. Well 69, located below 46, overall displays a <br />decreasing TD5 trend (SF 0.5), although values have increased since May <br />2002. <br />Well 68, completed in the Bond Creek alluvium (below NPDES 008), was <br />drilled along with 4Ve11 69 (see above) in 1988. It displayed a slightly <br />increasing TDS trend (SF 0.5), although values have decreased since May <br />2001. <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 />- Wadge Coal. Two wells are used to monitor the water quality of this <br />seam. Well 17 is located just west of NPDES 002. It displays an <br />increasing TDS trend. Well 19 is located in the southwest part of the <br />7 <br />