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water out of Pond 002, were capped off on July 7, 2010. Additional ponds <br />(the Upper and Lower Sumps) were constructed above this pond in 2011. <br />Review of the TDS plot indicates an increasing trend, with the peak <br />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): YSGFS, 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, YSGS (the furthest downstream site). <br />Surface Water Site YSGFS. <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 August 2013. <br />Surface Water Site SW -S2-1 (SSG1). <br />This site monitors Grassy Creek upstream of mining at the PSCM. Review <br />of the TDS plot indicates a slightly increasing trend. <br />NPDES Discharge Point 003 (NPDES3). <br />Hydrographs presented in Appendix D show that flow has increased at this <br />site since September 18, 1984, when operation of the truck wash system <br />began. During operation, water was siphoned from the Wadge Impoundment <br />(NPDES2) into a holding pond. Overflow from the holding pond was <br />diverted into the shop ditch, which flows into NPDES3. Water was pumped <br />from the holding pond to the wash rack, drained into a settling pond, <br />and then into the same shop ditch. This operation increased the flow at <br />NPDES3 while decreasing the flow at NPDES2. <br />Other events have affected the long-term hydrograph at NPDES3. They <br />include the diversion away from NPDES3 of the runoff from an inactive <br />13 <br />