Laserfiche WebLink
• ephemeral to a perennial stream. Peak discharges from [he ponds do not seem to have changed significantly <br />because the spoil spring water would probably have discharged as snowmelt runoff anyway. <br />Water Quality <br />Summaries of the water quality data for the Mine 1 and Eckman Park ponds are presented on Tables 42 <br />through 45. The field conductivity data shows some typical seasonal variation: the water quality improves <br />during spring runoff Ponds A, D, F, and H appear to be impacted by spoil spring inflows. The discharge <br />rates from H are not significant during irrigation season and therefore do not cause any significant impacts. <br />For the ponds affected by spoil springs, increased calcium, magnesium, sulfate, TDS, and SAR are typically <br />observed. No significant changes in parameters were observed for the ponds during the 2000. Conductivity <br />and TDS levels observed on Trout Creek have recently been observed at levels lower than predicted by the <br />CYCC PHC. The levels documented during 2000 at site 1005, the downstream monitoring site established for <br />Permit No. C-82-056, were well below 2000 mg/I and therefore likely did no[ cause or have the potential to <br />cause material damage. The water quality of Trout Creek was better than maximum levels predicted in the <br />past salt-loading calculations performed as part of the "probably hydrologic impacts" section of [he mine <br />permit application with a maximum value of 590 mg/I recorded in September of 1998. <br />SUMMARY <br />Increased salt loading from [he Mine No. 1 and Eckman Park discharges have been observed since ]982. They <br />appear to have leveled off starting in 1986. The increased salt loading is predicted and described in the <br />. "probable hydrologic consequences" section of the permit document and has been revised during the permit <br />renewal process. Actual observed salt loading in Trout Creek during the irrigation season resulting from <br />surface mining operations has to date been less than tftat predicted due to the occurrence of attenuating Flows <br />from other drainages and has not caused material damage. The total recoverable manganese levels in Foidel <br />Creek are below the stream standard. <br />Localized increases in TDS in the Foidel Creek alluvium have been observed; however, these increases are <br />confined to areas immediately adjacent to the mine and no material damage has or is expected to occur. As <br />predicted, two Wadge Overburden wells have increased TDS levels. This increase is within predicted levels <br />and since there are no water supply wells completed in this aquifer (except by the mines) no material damage <br />has or will occur. No significant impacts have been observed. <br /> <br />CYCC2000.doc I/31/Ol 8 <br />