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Mid-Continent Report; Nov. 15, 1993 <br /> Steve Renner/Harry Posey <br /> Page 9 <br /> 1988 AHR. Road use probably decreased, and the combination of decreased road use and <br /> installation of sediment collection ponds likely caused TSS concentrations to fall. <br /> There is no discernable indication that flooding of the adit and the subsequent "natural" <br /> discharge caused deterioration of water quality by Dissolved Solids beyond that caused by the <br /> prior pumped discharges. However, there does appear to be an excursion toward poorer TDS <br /> quality water after the adit was constructed and in operation. Higher dissolved solids appear to <br /> consist of Na and Ca sulfates and dissolved clays, as deduced from the pre-existing water quality <br /> information and the known composition of the local rocks. <br /> Overall, water quality from the mine area has improved in some respects but has deteriorated <br /> in others. Unless the adit intersected base metal sulfide veins that are now weathering and <br /> contributing to poor water quality (high TDS) it is highly unlikely that the parameters that have <br /> lowered the water quality are of the type that would injure wildlife. It would be appropriate to <br /> collect water quality monitoring samples at station #20 over the next year, analyze them for a <br /> full suite of base metals, and from that determine whether the mine water discharge is of a <br /> different composition than that of the general water quality prior to construction of the adit. <br /> cc: Mike Long <br /> Jim Pendleton <br /> Larry Routten <br /> Tony Waldron <br /> Attachments.- <br /> The Crystal River Drainage Study August 1978 - May 1979 <br /> USGS Multiple station analyses (Processed 11-10-93) <br /> Water quality data exerpts; Mid-Continent Annual Hydro Reps. <br /> Graphs showing flow, TDS, TSS, and Conductivity <br /> m:min\hhp\midcont.rep <br />