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DISCUSSION <br />Colorado law defines acute toxicity as a statistically signif- <br />icant difference, at the 95t confidence level, between mortality in <br />the control and in any effluent concentration equal to or less than <br />the instream waste concentration, or, as 50$ or greater mortality <br />in any effluent concentration. <br />The results of this test indicate that discharge 002 would not <br />cause acute toxicity to aquatic invertebrates in any potential <br />receiving waters. Therefore, discharge 002 from the Craig Mine is <br />currently in compliance with acute WET test limitations specified <br />in the Trapper Mining permit to discharge. <br />-5- <br />COMMERCIAL TESTING & ENGIN EERING CO. <br />Otlginal CoOY H'eiermerk¢4 <br />For Vour Proletllon <br />F.<ff. <br />Lim <br />