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1993 = 0.602 cfs " <br />1992 = 0.072 cfs <br />1991 = 0.072 cfs if <br />1990 = 0.076 cfs if <br />1989 = 0.181 cfs if <br />1988 = 0.055 cfs <br />1987 = 0.070 cfs <br />1986 = 0.568 cfs if <br />1985CY (Calendar Year) = 1.172 cfs of <br />1984CY = 1.439 cfs it <br />1983CY = 0.531 cfs " <br />1982CY = 0.547 cfs " <br />1981CY = 0.098 cfs " <br />198OCY = 0.990 cfs " <br />This year's average flow value, 0.460 cfs, is 82% Of the historic (1980- <br />2010) average flow value, 0.562 cfs. The timing of when flow values are <br />collected affects these averages. Flow values at this site were affected <br />by the pumping of water from this pond for the truck wash system and for <br />water trucks (dust control). Pumping for the truck wash system began on <br />September 18, 1984. 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. Also, the upper end of this pond was regraded in 2002. <br />Review of the TDS plot indicates a recently stable trend (SF 0.2), with <br />the peak value occurring in August 2006. <br />Grassy Creek Drainage. Six monitoring sites lie within the Grassy Creek <br />drainage. They are (from upstream to downstream) : YSGF5, SSG1, NPDES <br />Discharge 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), SSG3 (which monitors discharges from pre-SMCRA mining areas and <br />is located just below SSG2) and, finally, YSG5 (the furthest downstream <br />site). <br />• <br />13