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2010 AHR. Its TDS plot indicates a slightly increasing trend, with the <br />peak value occurring in September 2006. <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 February <br />24, 1997. Flow at this pond is normally continuous. Average flow this <br />year was 0.0647 cfs, which is 400 less than its historic (1997-2014) <br />average, 0.1617 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 of the 2010 AHR. NPDES10 <br />exhibits a slightly increasing TDS trend. However, the peak value <br />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. Average flow this year was 0.0025 <br />cfs, which was 900 less than the historic (1998-2014) average, 0.0261 <br />cfs. The timing of when flow values are collected affects these <br />averages. Due to high sediment level, this pond was dredged out in the <br />fall of 2003. TDS values exhibited an increasing trend, with the peak <br />value occurring in 2011. <br />- Site YSGFS. This site exists on Grassy Creek below the NPDESII pond. <br />A statistical summary of baseline chemistry data is provided in Appendix <br />D1 of the 2010 AHR. Its TDS plot indicates an increasing trend, with the <br />peak value occurring in 2013. This site is also a part of the Peabody <br />Sage Creek Mine monitoring program. <br />- Site YSGS. This site exists on Grassy Creek below all discharges from <br />both the Yoast and Peabody Sage Creek Mines. It became part of the <br />required monitoring program in October 1995. TDS values here are <br />affected more by the Peabody Sage Creek Mine than the Yoast Mine. TDS <br />11 <br />