Laserfiche WebLink
year was 0.2912 cfs, which is 75% greater than its historic (1997 -2012) <br />average, 0.1668 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. This year, flow started in early <br />May and ended in July. Average flow this year was 0.0056 cfs, which was <br />79% less than the historic (1998 -2012) average, 0.0269 cfs. The timing <br />of when flow values are collected affects these averages. Due to high <br />sediment level, this pond was dredged out in the fall of 2003. TDS <br />values exhibited an increasing trend, with the peak value occurring in <br />2011. <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 />D1 of the 2010 AHR. Its TDS plot indicates an increasing trend, with the <br />peak value occurring last year. This site is also a part of the Peabody <br />Sage Creek Mine monitoring program. <br />- Site YSG5. 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 />values exhibit a slightly increasing trend, with the peak value <br />occurring last year. This site is also a part of the Peabody Sage Creek <br />Mine monitoring program. <br />10 <br />