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- NPDES10. This sediment pond on Annand Draw was completed in August <br />1996. Flow was observed at this site for the first time ever on February <br />24, 1997. Flow at this pond is normally continuous. Average flow this <br />year was 0.1316 cfs, which is 16% below its historic (1997-2010) <br />average, 0.1577 cfs. The timing of when flow values are collected <br />affects these averages. This pond was dredged out in 2002. Baseline data <br />for this site, both downstream (Site YSA4) and upstream (Site YSAF4) of <br />the pond, have been provided in Appendix D1. NPDES10 exhibits a slightly <br />increasing TDS trend. However the peak value occurred in 2002. <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 1998. <br />No discharge occurred in 1999 or 2000. This year, this pond started <br />flowing in April and stopped flowing in June. This year's average flow, <br />0.0102 cfs, is 59% below its historic (1998-2010) average, 0.0247 cfs. <br />The timing of when flow values are collected affects these averages. Due <br />to high sediment level, this pond was dredged out in the fall of 2003. <br />TDS values exhibit an increasing trend. 0 <br />- Site YSGF5. This site exists on Grassy Creek below the NPDESII pond. <br />A statistical summary of baseline chemistry data is provided in Appendix <br />Dl. Its TDS plot indicates an increasing trend. This site is also a part <br />of the Peabody Sage Creek Mine monitoring program. <br />- Site YSG5. 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 by <br />the Seneca II Mine than the Yoast Mine. TDS values exhibit a decreasing <br />trend (SF 0.5). This site is also a part of the Peabody Sage Creek Mine <br />monitoring program. <br />Springs <br />- Spoil Spring 1 (YSSPGI). This spoil spring was discovered in September <br />2002. It is located just above the old haul road culvert crossing Annand <br />Draw. Its TDS plot displays a decreasing trend. <br />10