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. parameters and flow estimates may sometimes be provided voluntarily when <br />not required. This site is upstream of Seneca II Mine discharges. <br />- Surface Water Site SW-52-13 (SSF13). This site monitors Fish Creek <br />downstream of its confluences with Cow Camp Creek and Bond Creek. It is <br />monitored at the same frequency as Site 11. The increase in TDS values, <br />from Site 11 to Site 13, was from 180 to 180 mg/1 (0~ increase) in May. <br />This site displays a stable TDS trend. <br />On Page 7-247 of the Seneca II 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. I:n 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 June or July this year. As stated in the previous paragraph, <br />a 0~ increase in TD;S was noted between the two sites in May. It appears <br />• that the Seneca II Mine has little impact on Fish Creek. Water <br />discharged from the mine is lost to stock ponds, evapotranspiration, and <br />the 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 />Park appear to have a much greater impact on the water quality of Fish <br />Creek. <br />Little Grassy Creels Drainage. Two monitoring sites lie within the <br />Little Grassy Creek drainage: Site 5, located in the southwest portion <br />of the permit area and NPDES Discharge Point 002, also known as the <br />Wadge Impoundment. <br />- Surface Water Site SW-S2-5 (SSLGS). Site 5 drains the upper reaches <br />of Little Grassy Creek which are undisturbed by mining. A comparison of <br />its hydrograph to that of NPDES 002 indicates that Site 5 is a <br />relatively minor contributor to the flow in this basin. <br />15 <br />