2014-02-26_REPORT - C1980005 - Laserfiche WebLink

Home Browse Search

- Surface Water Site SW -S2 -13 (SSF13) . This site monitors Fish Creek downstream of its confluences with Cow Camp Creek and Bond Creek. It is monitored at the same frequency as Site 11. The increase in TDS values, from Site 11 to Site 13, was from 210 to 230 mg /l (10% increase) in May; and 548 to 572 mg /l (4% increase) in August. This site displays a decreasing TDS trend. On Page 7 -247 of the Seneca II Mine Probable Hydrologic Consequences (PHC) , predictions were made for the TDS increases to be observed on Fish Creek during the months of June and July due to discharges from the Seneca II Mine. In June, an increase from 421 to 497 mg /l (18 %) is predicted between SSF11 and SSF13. In July, an increase from 533 to 607 mg /l (13 %) is predicted between SSF11 and SSF13. As indicated above, no lab samples were collected in June or July of this year. However, as stated in the previous paragraph, a 10% increase was observed in May and a 4% increase in August. It appears that the Seneca II Mine has little impact on Fish Creek. Water discharged from the mine is lost to stock ponds, evapotranspiration, and the alluvium as it flows through Twentymile Park. Dissolved solids from mine discharges are diluted during the snowmelt runoff in March and April (prior to the irrigation season) by high stream flows with relatively low TDS concentrations. The natural conditions in Twentymile Park appear to have a much greater impact on the water quality of Fish Creek. Springs. Spoil spring data may be found after the surface water data presented in Appendix D. Spoil spring data provided are water quality data for the past two years, a hydrograph of historic flow measurements and a LOWESS plot of TDS values. - Spoil Spring 9. This spring is located in the area immediately upstream of the 008 Pond. It exhibits an increasing TDS trend, with the peak TDS occurring in 2003. 9