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measurements shows lower than normal flows. Review of Table 17 shows water at this site <br />• to be a NgCeNa-504 type. The average 7D5 value of 887 mg/L falls within the historic <br />range. <br />NPDES Discharge Point 002. Hydrographs based on weekly flow measurements ere presented in <br />Appendix E. The hydrographs consist of two pages, the first is for data collected in 1994 <br />only, end the second shows historical data from January, 1980, to September, 1994. Review <br />of the second hydrograph shows lower than normal flows. This is also confirmed by the <br />following table which lists the mean weekly flows for each year. <br />1994YY (water Year) 0.114 cfs <br />1993YT = 0.602 cfs <br />1992wY = 0.072 cts <br />1991NY = 0.072 cfs <br />1990NT = 0.076 cfs <br />1989wY = 0.181 cfs <br />1988WY = 0.055 cfs <br />1987NY = 0.070 cfs <br />1986NY = 0.568 cfs <br />• 1985CY (Calendar Year) = 1.172 cfs <br />1984CT = 1.439 cfs <br />1983CY = 0.531 cfs <br />1982CY = 0.547 cfs <br />1981CY = 0.098 cfs <br />7980CY = 0.990 cfs <br />Discharges measured et this site are also effected by the pumping of water from this pond <br />for the truck wash system. This pumping began on September 18, 1984. <br />Review of Table 15 shows this water to be a MgC a-504 type. The annual average TDS value <br />of 2965 mg/L at this site in 1994 is the highest yet. This high value is due to the <br />presence of flow in the fall and winter (with water of high TDS values) that normally does <br />not occur. <br /> Grassy Creek Drainage. Three monitoring sites lie within the Grassy Creek drainage: <br /> Surface 4ater Site 5Y-52-1, located upstream on Grassy Creek; NPDES Discharge Point 003, <br />• also known es the Shop Reservoir or the Northwest Impoundment, located just north of the <br />13 <br />