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Surface water Site Sw-S2-11. This site was instituted in May, 1987, and monitors Fish <br />Creek upstream of its confluence of Cow Camp Creek. It is monitored May through September <br />on a monthly basis and only if either Sites 10 or 12 are flowing. water at this site is a <br />CaMg-HC03 type (see Table 17, Appendix A). The significantly loner TDS value reported <br />this year is a result of sampling only in May and June (i-e-, only uh en Sites 10 or 12 are <br />flowing) when TDS values are low- In prior years, Site 11 was sampled May through <br />September. This site is upstream of mine discharges; therefore, its water chemistry is <br />primarily the result of natural or background conditions. <br /> Surface water Site Sw-52-13. This site was instituted in May 1987 and monitors Fish Creek <br /> downstream of its confluence with Bond Creek. It is monitored May through September on a <br /> monthly basis and only if e ither Sites 10 or 12 are flowing- water at [his site is a <br /> CaMg-HC0 <br />type <br />50 (see Table 17, Appendix A). As with Site 11, the TDS va lue reported on <br /> 3 <br />4 <br /> Table 20 for this year was significantly lower than that of prior years due to samples <br /> being taken only in May and June. The increases in TDS values from Site 17 to Site 13 <br /> (which indicate [he impact from the Seneca 11 Mine discharges) were only 70 mg/l in May <br /> and no increase in June. Thi s data strongly indicates that the discharges of Bond and Cou <br /> Camp Creeks (and, therefore, the discharges of the Seneca fI Mine) have a n insignificant <br /> impact on Fish Cre ek. <br />To summarize water quality in the Fish Creek basin, it appears that the Seneca II Mine has <br />little, if any, impact on Fish Creek. water discharged from the mine is lost to stock <br />ponds, evapotranspiration and the alluvium as it flows Through 7uentymile Park. Dissolved <br />solids from mine discharges are diluted during the snowmelt runoff in March and April <br />(prior to the irrigation season) by high stream flows with relatively low TDS <br />concentrations. The natural conditions in 7uentymile Park appear to have a much greater <br />impact on the eater quality of Fish Creek, As a final note, it was observed that the <br />irrigation ditch that diverts eater from Fish Creek just upstream of the confluence of <br />Bond Creek was observed to be flowing only during the May visit of this year. <br />Little Grassv Creek Drainaa e. Two monitoring sites lie within the Little Grassy Creek <br />drainage: Surface eater Site SW-52-5, located in the southwest portion of the permit area <br />and NPDES Discharge Point 002, also known as the wadge Impoundment. <br /> Surface water Siie Sw-52-5. Surface water Site Sw-52-5 drains the upper reaches of Little <br />• Grassy Creek which are undisturbed by mining. Review of the hydrograph of monthly flow <br />S~ <br />15 <br />