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inflow from tributaries to Cow Camp Creek. • <br />Water at this site is a MSCaN a-S04 type (see Table 20, Appendix A>. TDS increases <br />downstream due to the alkaline and saline nature of the soils along Cow Camp Creek in <br />Twentymile Park, and due to the evaporation in several stock reservoirs located on Cou <br />Camp Creek between the two sites. TDS values at Site 10 fluctuate from year to year. <br />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 flow through its principal spillway first occurred on February 25, <br />1988. the mean weekly flows for the 008 site are: <br />1990 WY (Water Year) = 0.067 cfs <br />1989 WY = 0.108 cfs <br />7988 WY = 0.704 (reservoir did not completely fill until February 25, <br />1988). <br />Review of the hydrographs and the above table shows that discharges monitored during 1990 • <br />were less than those noted in prior years. This is due to the decreased precipitation <br />noted this year, and also the decrease in drainage basin area as a result of mining. <br />Review of Table 18 (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-NCO3 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 Water Site SW-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 was noted also at [he lower Cow Camp Creek Site 10, [his site flows <br />less often than the upper Bond Creek site, NPDES 008. Flow again was observed only during <br />[he May visit for the same reasons given for Site 10. Flow was 117 percent greater at <br />Site 12 than the floe at NPDES 008 in May due to the contribution of floes by unmonitored <br />tributaries to Bond Creek. <br />7 <br />14 <br />