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due to the contribution of waters from Spoil Springs 3, 4, and 5. <br />Further downstream, Well 6 has historically displayed an increasing TDS <br />trend although recently TDS values have dropped. Furthest downstream on <br />Little Grassy Creek and below NPDES 002, is Well 31A. It also displays <br />an increasing TDS trend. However, all three of these well's TDS trends <br />appear to be stabilizing. <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 IZ and also downstream of the <br />confluence with Scotchmans 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, rising and <br />falling for no apparent reason. Since October 2001, the trend has been <br />increasing. Well 69, located below 46, interestingly displays a <br />decreasing TDS trend. <br />Well 68, completed in the Bond Creek alluvium (below NPDES 008), was <br />drilled along with Well 69 (see above) in 1988. It displays a slightly <br />increasing TDS trend. <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 />permit area. It displays a decreasing TDS trend. <br />7 <br />