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measurements shoos loner Than normal flows the pa sf five years. Review of Table 16 <br />(Appendix A) shoos eater at this site To be a CaMgNa-S04 type. The TDS average for this <br />year was loner than that of the past six years because TDS samples were taken at higher <br />flows (therefore, loner TDS) than in prior years. <br />NPDES Discharge Point 002. Hydrographs based on weekly flow measurements are presented in <br />Appendix E. the hydrographs consist of too pages, the first is for data collected in 1991 <br />only, and the second shoos historical data from January, 1980, to September, 1991. Review <br />of the second hydrograph shows that floes the past five years have been loner than normal. <br />This is also confirmed by the tollouing table which lists the mean weekly floes for each <br />year. <br />1991 WY (Water Year) = 0.072 cfs <br />1990 WY = 0.076 cfs <br />1989WY = 0.181 cfs <br />1988WY = 0.055 cfs <br />1987WY = 0.070 cfs <br />1986WY = 0.568 cfs <br />1985 CY (Calendar Year) = 1.172 cfs <br />1984CY = 1.439 cfs <br />1983CY = 0.531 cfs <br />1982CY = 0.547 cfs <br />1961CY = 0.098 cfs <br />1980CY = 0.990 cfs <br />Discharges measured at this site ere also affected by the pumping of eater from this pond <br />for the truck wash system. This pumping began on September 18, 1984. In addition, spring <br />runoff tLous are affected primarily by the snoupack for that winter and not what the total <br />precipitation was for that whole water year. In other cords, a normal water year (in <br />regards to total precipitation) may have below normal spring runoff if the snoupack for <br />that winter was below normal. <br />l~Review of .Table 15 (Appendix A) shoos this water to be a MgCa-S04 type. TDS values at <br />~1 / this site have remained relatively stable since 1981, indicating that the eater quality of <br />~:' spoils discharges into this pond have also stabilized. <br />r/`/\ <br /> <br /> <br />16 <br />