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• 1988. The mean weekly flows for the 008 site are: <br />1992 WY (Water Yeer) = 0.132 cfs <br />1991 WY = 0.112 cfs <br />1990 WY = 0.067 cfs <br />1989 WY = 0.108 cfs <br />1988 WY = 0.104 (reservoir did not completely fill until February 25, <br />1988). <br />Review of the hydrograph end the above table shows that discharges have increased since <br />1990. This is due to an increase in annual precipitation values and an increase in flow <br />from Spoil Spring pt. <br />Review of Table 15 (Appendix A) shows that water at the 008 site is a MgCa-504 type. Data <br />for Site 9 is also supplied on this table to provide baseline data for comparison. Water <br />previously sampled at Site 9 was a CaMg-HC03 type. The construction of Pond 008 and <br />subsequent mining activities above have resulted in increased TDS and sulfate in <br />comparison to baseline water quality measured at Site 9. <br />• l <br /> For NPDES 006, TDS and sulfate values have been pl tad on o and <br />ne graph, manganese (tota <br /> dissolved) on a second, end zinc on a third (see Appendix H). As with Site b, TDS and <br /> sulfate are increasing with time, vary seasonally end vary dependently ui th each other. <br /> Manganese values vary seasonally with the highest values occurring in the spring. No <br /> longer term discernible trend is apparent. Zinc values vary seasonally. A slight upward <br /> trend of zinc values is apparent. <br />Surface Water Site SW•S2.12. This site was instituted in Nay, 1987, and monitors Bond <br />Creek at its confluence with Fish Creek. It is monitored May through September on a <br />monthly basis. ps was noted also at the lower Cow Lamp Creek Site 10, this site flows <br />less often than the upper Bond Creek site, NPDES 008. Flow was observed at Site 12 only <br />during the May and June visits. In May, flow et Site 12 was 20 percent of that observed <br />at NPDES 008. In June, flow at Site 12 was 9.5 percent of that observed at NPDES 008. <br />These flow decreases are due to evapotranspiration and infiltration losses. <br />Water et Site 12 during the 1992 Water Year was a MgC aN a-504 type (see Table 17, Appendix <br />• A). A significant increase of TDS from that observed at upper Bond Creek again indicates <br />[he alkaline and saline nature of Tuentymile Park. Stock reservoirs also exist along Bond <br />15 <br />