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table which lists the mean weekly floes for each year, which shoes that this year's <br />avera <br />e flow vas the hi <br />hest since 1993 and 1956 • <br />g g . <br />3995WY (Water Year) = 0.386 cfs <br />1994WY = 0.114 cfs <br />1993WY = 0.602 cfs <br />1992WY = 0.072 cfs <br />1991WY = 0.072 cfs <br />1990WY = 0.076 cfs <br />1989WY = 0.181 cfs <br />1988WY = 0.055 efs <br />1987WY = 0.070 cfs <br />1986WY = 0.568 c£s <br />1985CY (Calendar Year) = 1.172 cfs <br />1984CY = 1.439 cfs <br />1983CY = 0.531 cfs <br />1982CY = 0.547 cfs <br />1981CY = 0.098 efs <br />1980CY = 0.990 efs <br />Discharges measured at this site are also affected by the pumping of water from this pond <br />for the truck wash system. This pumping began on September 18, 1984. Aeview of the TDs <br />plot indicates a slight increaslnq trend. <br />Grassy Creek Drainage. Three monitoring sltes lie within the Grassy Creek drainage: <br />Surface Water Site SW-S2-1, located upstream on Grassy Creek; NPDES Discharge Point 003, <br />also known as the Shop Reservoir or the Northwest Impoundment, located ]ust north of the <br />mine shop area: and Surface Water Site SW-32-2, located approximately 0.1 mile downstream <br />of where NPDES 003 discharges into Grassy Creek. <br />Surface Water SSte SW-32-1 (9SG1). This site monitors the upper reaches of Grassy Creek <br />which are undisturbed by mining of the Seneca II Hine. Review of the hydrograph of <br />monthly flow readings shove the highest peak £low since 1993 and 1986. Review of the TDS <br />plot Sndicates a slightly inezeaainq trend. <br />• <br />NPDES Discharge Point 003 (NPDE83). Sydrographs presented in Appendix E show that floe <br />has increased at this site since September 18, 1984, when operation of the truck wash • <br />12 <br />