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• - Surface Water Site SW-S2-12 (SSB12). This site monitors Bond Creek at <br /> its confluence with Fish Creek. St is monitored May through July on a <br /> monthly basis. This year, no flow was observed at this site in July, <br /> although NPDES 008 upstream was flowing almost continuously. This <br /> reduction in flow is due to stream channel infiltration and <br /> evapotranspirat ion, The TDS plot indicates a recently stable trend . <br />- Surface Water Site SW-S2-11 (SSF11). This site monitors Fish Creek <br />upstream of its confluence of Cow Camp Creek. It is required to be <br />monitored May through July on a monthly basis, but only if either Sites <br />10 or 12 are flowing (for this year, only in May and June). However, <br />field parameters and flow estimates may sometimes be provided <br />voluntarily when not required. This site is upstream of Seneca II Mine <br />discharges. <br /> - Surface Water Site SW-S2-13 (SSF13). This site monitors Fish Creek <br /> downstream of its confluences with Cow Camp Creek and Bond Creek. Zt is <br />• monitored at the same frequency as Site 11. The increase in TDS values, <br /> from Site 11 to Site 13, was from 170 to 180 mg/1 (~ increase) in May <br /> and 280 to 280 mg/1 (0~) in June. Thi s site displays a decreasing TDS <br /> trend. <br />On Page 7-247 of the Seneca ZI Mine Probable Hydrologic Consequences <br />(PHC), predictions were made for the TDS increases to be observed on <br />Fish Creek during the months of June and July due to discharges from the <br />Seneca II Mine. In June, an increase from 421 to 497 mg/1 (18$) is <br />predicted. In July, an increase from 533 to 607 mg/1 (13~) is <br />predicted. Neither lower Bond Creek nor lower Cow Camp Creek was <br />flowing in July this year. As stated in the previous paragraph, a 0~ <br />increase in TDS was noted between the two sites in May. It appears that <br />the Seneca II Mine has little impact on Fish Creek. Water discharged <br />from the mine is lost to stock ponds, evapotranspiration, and the <br />alluvium as it flows through Twentymile Park. Dissolved solids from <br />mine discharges are diluted during the snowmelt runoff in March and <br />• April (prior to the irrigation season) by high stream flows with <br />relatively low TDS concentrations. The natural conditions in Twentymile <br />15 <br />