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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 sample from <br /> Tenmile Drainage is not acutely toxic and would comply with Whole <br /> Effluent Toxicity (WET) limitations for acute test outlined in <br /> discharge permits. <br /> -4- <br /> COMMERCIAL TESTING & ENGINEERING CO. <br /> F-466 I� <br /> Original Watermarked For Your Protection <br />