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dissolved load upstream of the mine discharge and two orders of <br /> magnitude below the dissolved load downstream of `.he mine discharge. <br /> Th major portion of this increase in TDS is as calcium and sulfate . <br /> Dissolved metal concentrations are essentially unaffected by the mine <br /> discharge . Zinc is the primary metal that exists in levels which <br /> coi;ld be detrimental to fish. Dissolved oxygen a��ove and below the <br /> mine discharge is adequate for trout spawning. Ali necessary <br /> nutrients , as expressed by ammonia, nitrate, potassium, and <br /> phosphate , are in low concentrations . <br /> Fall water quality in the Animas River above and below the <br /> tailings pond reach is dominated by ground water -'ischarge to the <br /> r' ..er. Animas River waters are again a calcium sulfate with very low <br /> meals , TDS , TSS, acidity, and near neutral pH (sites AR-3 . 5 and <br /> AR-4 , Table 3 ) . No significant differences can be detected between <br /> the- upstream (AR-3 . 5) and downstream (AR-4 ) monitoring sites . <br /> The small stream flowing past Tailings Pond No. 3 shows no <br /> significant change in water quality above and below the tailings <br /> pond. pH, metals, TDS, TSS, acidity, and the calcium sulfate water <br /> type remain essentially unchanged between the two monitoring sites <br /> (sites SCTP3-1 and SCTP3-2, Table 3) . <br /> Eureka Gulch waters above the Terry Tunnel discharge are of low <br /> TD, and neutral pH (site EC-1 , Table 3) . Dissolved metals are <br /> slightly higher than in the Animas River, but they should not impact <br /> fish populations. Eureka Gulch itself does not exhibit habitat <br /> suitable to trout colonization due to the steep gradient, small pools <br /> an, freezing conditions in winter. <br /> -19- <br />