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i <br />1981CY ~ = 0.098 efe • <br />1980CY = 0.990 c£s " <br />Flow values at this site are affected by the pumDiag of water £rom this Dond for <br />the truck wash eyatem and for water trucks (duet control). Pumping for the <br />truck wash system .began on September 1B, 1984. Aeviem of the TDS plot indicates <br />an increasing trend. <br />Grassy Creek Drainage. Four monitoring sites lie within the Grassy Creek <br />drainage: Site 1, located uDatream oa Grassy Creek; NPDE9 Discharge Point 003, <br />also known as the Shop Reservoir or the Northwest Impoundment, located just <br />worth of the mine shop area; Site 2, located approximately 0.1 mile downstream <br />of where NPDE9 003 discharges into Graeey Creek; sad 91te 3, which monitors <br />discharges from Dre-SMCRA mining areas and is located adjeceat to site 2. <br />- Surface Water Site SW-52-1 (SSG1). This site monitors Graeey Creek upstream <br />of mining by the Seneca II Miae. Review of the TDS plot indicates n slightly <br />iacreasiag tread. <br />- NPDES Discharge Point 003 (NPDE53). Hydrograyhs presented in Appendix D show <br />that flow has increased at this site since 8aptember 18, 1984, whew operation of <br />the truck wash eysiem began. water ie siphoned from the Wedge Impoundment <br />(NPDES 002) into a hol8inq pond. Dverflow from the holding Doad ie diverted <br />into the ehoD diteb, which flows into NPDES 003. Water ie Dumped from the <br />holding Dond to the wash rack, drains into a eettliag Doad, and then into the <br />same ehoD ditch. ~Thie operation has increased the flaw at NPDE9 003 while <br />decreasing the £low at NPDES 002. Two other events that affected the long-term <br />hydrograph include the diversion away from NPDE9 003 of runoff from en inactive <br />fly ash pit (operated by the Rayden station Dower ylaat) is October, 1980; sad <br />the diversion away from NPDES 003 of runoff contained is the Northwest Diversion <br />Ditch (wee the Seneca II Permit ADplicatioa, 8xhibit 7-7, Surface Water <br />Hydrology Map and oleo the 1982 Seneca II AHR) in April, 1952. Finally, <br />discharge volumes at the 003 site have been affected by the reduction in <br />diameter of the discharge culvert (36 inches to 6 inches) which occurred oa July <br />19, 1988. No comparison of this years' flows to prior yearn ie presented since • <br />16 <br />