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Permit C-81-071 1996 Annual Hydrology Report <br />documented during 1996 at site 1005, the downstream monitoring site established for Permit <br />(• No. C-82-056, were well below 2000 mg/I and therefore likely did not cause or have the <br />potential to cause material damage. The water quality of Trout Creek was better than <br />maximum levels predicted in the past salt-loading calculations performed as part of the <br />"probably hydrologic impacts" section of the mine permit application with a maximum value of <br />460 mg/I recorded in September of 1996. Only insignificant discharges at Mine 2 were <br />recorded during spring runoff. Therefore no impacts to Fish Creek were observed as a result of <br />runoff from Mine No. 2 in 1996. <br />SUMMARY <br />Increased salt loading from the Mine No. 1 and Eckman Park discharges have been observed <br />since 1982. They appear to have leveled off starting in 1986. The increased salt loading is <br />predicted and described in the "probable hydrologic consequences" section of the permit <br />document and was recently revised during the latest permit renewal process. Actual observed <br />salt loading in Trout Creek during the irrigation season resulting from surface mining operations <br />has to date been less than that predicted due to the occurrence of attenuating flows from other <br />drainages and has not caused material damage. The total recoverable manganese levels in <br />Foidel Creek are below the stream standard. <br />Localized increases in dissolved solids in the Foidel Creek alluvium have been observed; <br />however, these increases are confined to areas immediately adjacent to the mine and no <br />material damage has or is expected to occur. As predicted, two Wadge Overburden wells have <br />increased dissolved solids levels. This increase is within predicted levels and since there are <br />no water supply wells completed in this aquifer (except by the mines) no material damage has <br />or will occur. No significant impacts have been observed. <br />r~ <br />U <br />I IDOCUMENTIAHRIECKMAN\EP96TEXT.DOC 03/28/97 Page 11 <br />