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DISCIISSION <br />Colorado law defines acute toxicity as 50% or greater mortality in <br />any effluent concentration or, 'as a statistically significant <br />difference, at the 95% confidence level, between mortality in the <br />control and in any effluent concentration equal to or less than the <br />instream waste concentration. In this test the inlet spring water <br />was considered the effluent. <br />By the above definition, the spring sample from Somerset mine <br />collected on October 13, 1992, was found to be acutely toxic to <br />Ceriodaphnia dubia. This spring water comprises approximately 66% <br />of effluent from Somerset mine. <br />-4- <br />MME <br />~~~~~ Cope Watermarketl <br />ro~ \our Pro~ecn cn <br />