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1994 <br />= 0.114 <br />cfs " <br />1993 <br />= 0.602 <br />cfs " <br />1992 <br />= 0.072 <br />cfs " <br />1991 <br />= 0.072 <br />cfs " <br />1990 <br />= 0.076 <br />cfs " <br />1989 <br />= 0.181 <br />cfs " <br />1988 <br />= 0.055 <br />cfs " <br />1987 <br />= 0.070 <br />cfs " <br />1986 <br />= 0.568 <br />cfs " <br />1985CY (Calendar Year) <br />= 1.172 <br />cfs " <br />1984CY <br />= 1.439 <br />cfs " <br />1983CY <br />= 0.531 <br />cfs " <br />1982CY <br />= 0.547 <br />cfs " <br />1981CY <br />= 0.098 <br />cfs " <br />1980CY <br />= 0.990 <br />cfs " <br />This year's average flow value, 0.432 cfs, is 26% below the historic <br />(1980-2014) average flow value, 0.582 cfs. The timing of when flow <br />values are collected affects these averages. Flow values at this site <br />were affected by the pumping of water from this pond for the truck wash <br />system and for water trucks (dust control). Pumping for the truck wash <br />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 />15 <br />