2013-04-25_REPORT - C1994082 (2)

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2010 AHR. Its TDS plot indicates a slightly increasing trend, with the peak value occurring in September 2006. Grassy Creek / Annand Draw - NPDESI0. This sediment pond on Annand Draw was completed in August 1996. Flow was observed at this site for the first time ever on February 24, 1997. Flow at this pond is normally continuous; however, no flow was noted in September of this year. Average flow this year was 0.0874 cfs, which is 24% less than its historic (1997 - -2011) average, 0.1661 cfs. The timing of when flow values are collected affects these averages. This pond was dredged out in 2002. Baseline data for this site, both downstream (Site YSA4) and upstream (Site YSAF4) of the pond, have been provided in Appendix D1 of the 2010 AHR. NPDESI0 exhibits a slightly. increasing TDS trend. However the peak value occurred in 2002. - NPDESII. This pond exists on a Grassy Creek tributary and was completed in October 1997. Flow was first observed at this'site in 1998. No discharge occurred in 1999 or 2000. This year, no flow was observed. The historic (1998 -2011) average was 0.0284 cfs. The timing of when flow values are collected affects these averages. Due to high sediment level, this pond was dredged out in the fall of 2003. TDS values exhibited an increasing trend. - Site YSGF5. This site exists on Grassy Creek below the NPDESII pond. A statistical summary of baseline chemistry data is provided in Appendix D1 of the 2010 AHR. Its TDS plot indicates a stable trend, with the peak value occurring in 2010. This site is also a part of the Peabody Sage Creek Mine monitoring program. - Site YSGS. This site exists on Grassy Creek below all discharges from both the Yoast and Peabody Sage Creek Mines. It became part of the required monitoring program in October 1995. TDS values here are affected.more by the Peabody Sage Creek Mine than the Yoast Mine. TDS values exhibit a stable trend, with the peak value occurring in 2007. �;