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the tower Cow Camp Creek Site 10, this site flows less often than the upper Bond Creek <br />site, MPDES 008. Flow was observed at Site 12 only during the Nay visit, while NPDES 008 • <br />flows continuously. This flow decrease is due to evapotranspiration and infiltration <br />losses. <br />Water at Site 12 during 1995 was a NgCaNa-504 type (Table 16). The 1994 average TDS value <br />of 2116 mg/l falls within the historic range. <br />Surface water Site SY-52-11. This site monitors Fish Creek upstream of its confluence of <br />Cow Camp Creek. It is monitored May through September on a monthly basis and only if <br />either Sites 10 or 12 are flowing. For this year, water at this site is a CaNg-HC03 type. <br />This site is upstream of Seneca 11 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 monitors Fish Creek downstream of its confluence <br />with Bond Creek. It is monitored at the same frequency as Site 11. Pater at this site in <br />1994 is a CaMg-XC03 type. The increases in TDS values from Site 11 to Site 13 was only <br />five percent in May. <br /> • <br />To summarize water quality in the Fish Creek basin, it appears that the Seneca 11 Mine has <br />little impact on Fish Creek . water discharged from the mine is lost to stock ponds, <br />evapotranspiration, and the alluvium as it flows through Twentymile 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 Twentymile Perk appear to have a much greater <br />impact on the water quality of Fish [reek. As a final note, the irrigation ditch that <br />diverts water from Fish Creek just upstream of the confluence with Bond Creek was not <br />flowing during any of the fiv e monthly visits. <br />Little Grassv Creek Drainage. Two monitoring sites lie within [he Little Grassy Creek <br />drainage: Surface Water Site SW-52-5, located in the southwest portion of the permit area <br />and NPDES Discharge Point 002, also known as the wedge Impoundment. <br />Surface water Site SW-52-5. Surface water Site 54-52-5 drains the upper reaches of Little <br />Grassy Creek which are undisturbed by mining. Review of the hydrograph of monthly flow <br />C J <br />12 <br />