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This fluctuation is due to annual changes in precipitation and is also dependent on the <br />flow volume each sample is taken from. <br />NPDES Discharge Point 008. This site replaces Site 9 which was used to gather baseline <br />information on Bond Creek in preparation of the 008 pond. Construction of 008 began on <br />August 4, 1987 and floe through its principal spi lluay first occurred on February 25, <br />1988. The mean weekly flows for the 008 site are: <br />1991 uY (Water Year) = 0.112 cfs <br />1990 uY = O.Ob7 cfs <br />1989 uY = 0.108 cfs <br />1988 uY = 0.104 (reservoir did not completely fill until February 25, <br />1988). <br />Review of the hydrograph and the above table sh ous that discharges monitored in 1991 were <br />greater than those noted in prior years. This is primarily due to the increased <br />precipitation noted for this year. <br />Review of Table 15 (Appendix A) shows that water at the 008 site is a MgCa-S04 type. Data . <br />for Site 9 is also supplied on this table to provide baseline data for comparison. eater <br />previously sampled at Site 9 was a CaM g-XC03 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 />Surface eater Site Su-52-12. This site was instituted in May, 1987, and monitors Bond <br />creek at its confluence with Fish Creek. It is monitored May through September on a <br />monthly basis. As uas noted also at the Lower Cou Camp Creek Site 10, this site flows <br />less often than the upper Bond Creek site, NPDES 008. Flow again was observed only during <br />the May and June visits for the same reasons given for Site 10. Flow uas 13 percent <br />greater at Site 12 than the floe at NPDES 008 in May due to the contribution of flows by <br />unmonitored tributaries to Bond Creek. In June, flow uas only 32 percent of that a[ NPDES <br />008 due to evapotranspiration losses. <br />Nater at Site 12 during the 1990 Nater year was a MgC aN a-504 type (see Table 17, Appendix <br />A). A significant increase of TDS from that observed a[ upper Bond Creek again indicates <br />the alkaline and saline nature of Twentymile Park- Stock reservoirs also exist along Bond <br />Creek and cause a further increase in TDS values. TDS values fluctuate from year to year <br />for the same reasons previously discussed for Site 10. <br />14 <br />