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�v <br /> The macroinve rate biomass was higher at each of the stations in <br /> June; however, is was mainly because of the abundance of tolerant taxa <br /> in the comm ity. All of the DAT Diversity Index values indicated stress <br /> conditionst Most of the taxa having less than resident population numbers <br /> indicated there was instability at each of the stations in this ecosystem <br /> Impacts were limiting to not only clean�water and moderately tolerant taxa, <br /> but also to some tolerant lo <br /> ✓' <br /> The potenti for fisheries in Is stream appeared to be_poor;✓_ <br /> particulary a the lower three stations, where the macro invertebrate <br /> biomass wa ower than one would expect in a stream with 128 to 185 mg/l <br /> ,S alkalini Such a stream should have about 4.0 g/m2 macro invertebrate <br /> / biomass. The 65 mg/l sulfate found at Station 2 would be limiting to V►A4-5 <br /> ------------ <br /> sensitive macro invertebrate species, and the sulfate of 52 at Station 3 1 <br /> was also within the threshold rang of some of the most sensitive �4-t,,s <br /> j-, mayflies. The number of cleanwater species found at each of the stations �� <br /> indicated there may be little, if any, suitable s awnin to <br /> rpa' �an available. <br /> — f <br /> In April, the BCI value of 96 ayE the upper station indicated that <br /> S Jl (� ecosystem was close to its potential, [a of 74, 72, and 7t Stations 2, <br /> acc� <br /> 3, and 4, respectively, indicated just fair conditions.A ere. o sp les <br /> were not present in resident population numbers hich indi ted even more <br /> stress in this ecosystem than was indicated by the BCI va ues. <br /> When sampled in June, the BCI values of 78 and 79 at Stations 1 and <br /> 2, respectively, indicated just fair conditions in those stream reaches. A <br /> BCI of 85 at Station 3 indicated conditions were fairly good there; <br /> however, many of the taxa still had less than resident population numbers. <br /> The BCI of 69 at _Station 4 indicated severe stress conditions in that <br /> stream �h. �It appeared there would be opportunities for management to <br /> improve instream habitat conditions, water quality, and possibly riparian <br /> habitat quality in this aquatic ecosystem. It appeared there may be some <br /> toxic effluents from the mine operation in this aquatic ecosystem. Jl <br /> 31 <br />