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DISCUSSION <br /> Colorado law defines acute toxicity as a statistically signif- <br /> icant difference, at the 95% 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 in <br /> any effluent concentration. <br /> The results of these tests indicate that the effluent collected on <br /> June 17, 1996 is not acutely toxic to C. dubia while the influent <br /> sample collected on June 17 and the influent and effluent samples <br /> collected on June 24 are acutely toxic to C. dubia. <br /> -4- <br /> COMMERCIAL TESTING & ENGINEERING CO. <br /> Original Copy Watermarked ALFor Your Protection <br /> F AFF <br />