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Appendix D, following the NPDE512 water quality reports. NPDE512 <br />exhibits an increasing TDS trend. <br />- Site YS52. This site exists on Sage Creek below all potential Yoast <br />Mine discharges. Monitoring at this site was resumed in 1998 after the <br />monitoring requirement was discontinued in 1993 (although field <br />parameters were occasionally collected in 1994 to 1997). Its TDS plot <br />indicates a stable trend. <br />Grassy Creek / Annand Draw <br />- NPDESI0. This sediment pond on Annand Draw was completed in August <br />1996. Flow was observed at this site for the first time ever on <br />February 24, 1997. Average flow this year was 0.140 cfs, which is 798 <br />of its historic (1997-2000) value, 0.177 cfs. Baseline data for this <br />site, both downstream (Site YSA4) and upstream (Site YSAF4) of the pond, <br />have been provided after the water .quality reports for this site. . <br />NPDESI0 exhibits an increasing TDS trend. <br />- NPDESII. This pond exists on a Grassy Creek tributary and was <br />completed in October 1997. Flow was first observed at this site in <br />1998. No discharge occurred in 1999 or 2000. This year's average flow, <br />0.010 cfs, is 52$ on its historic (1998-2000) value, 0.019 cfs. TDS <br />values exhibit an increasing trend. <br />- Site YSGFS. This site exists on Grassy Creek below the NPDESII pond. <br />Its hydrograph indicates the lowest peak flow since 1994 occurred this <br />year. Its TDS plot indicates an increasing trend. <br />- Site YSGS. This site exists on Grassy Creek below all discharges from <br />both the Yoast and Seneca II Mines. It became part of the required <br />monitoring program in October 1995. TDS values here are affected more <br />by the Seneca II Mine than the Yoast Mine. Its TDS plot indicates an <br />increasing trend. <br /> <br />11 <br />