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NPDES Discharge Point 002 (NPDES2). <br />This year's average flow value, 0.410 cfs, is 530 lower than the <br />historic (1980-2018) average flow value, 0.780 cfs. The timing of when <br />flow values are collected affects these averages. Flow values at this <br />site were affected by the pumping of water from this pond for the truck <br />wash system and for water trucks (dust control). Pumping for the truck <br />wash system began on September 18, 1984. The upper end of this pond was <br />regraded in 2002. The truck wash was last used in 2007. These pump <br />lines, which were siphoning water out of Pond 002, were capped off on <br />July 7, 2010. Additional ponds (the Upper and Lower Sumps) were <br />constructed above this pond in 2011. Review of the TDS plot indicates an <br />increasing trend, with the peak value occurring in February 2013. <br />Grassy Creek Drainage. <br />Five required monitoring sites lie within the Grassy Creek drainage. <br />They are (from upstream to downstream): YSGF5, SSG1, NPDES Discharge <br />Point 003, (also known as the Shop Reservoir or the Northwest <br />Impoundment, located just north of the mine shop area), SSG2 (located <br />approximately 0.1 mile downstream of where NPDES3 discharges into Grassy <br />Creek) and, finally, YSG5 (the furthest downstream site). <br />Surface Water Site YSGF5. <br />This site was initially part of the monitoring program for Seneca Coal <br />Company's Yoast Mine and is now part of the PSCM program. It is in the <br />upper part of Grassy Creek, just below the confluence of the Yoast NPDES <br />Pond 011. Review of the TDS plot indicates an increasing trend, with the <br />peak value occurring in September 2018. <br />Surface Water Site SW -S2-1 (SSG1). <br />This site monitors Grassy Creek upstream of mining at the PSCM. The site <br />was monitored in April and June of 2018; and no discharge was observed <br />in July and September. Review of the TDS plot indicates a slightly <br />increasing trend. <br />13 <br />