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Wyoming Fuel, 3505-087-135 _ <br />3.0 RESULTS AND DISCUSSION <br />Ceriodaphnia sp. mortality was < 5 percent in all effluent <br />treatment groups after 48-hours of exposure (Table 3-1). <br />Therefore, the 48-hour LC50 was > 100 percent effluent (Table 3- <br />2). No control mortality was observed during the test. The <br />acute NOEC was 100 percent effluent. During the test all <br />chemical parameters were within acceptable limits (Appendix A). <br />Dissolved oxygen concentrations remained > 5.6 mg/L (74 percent <br />of saturation at 4,800 feet elevation above sea level). Test <br />temperature was maintained at 20 + 1 C and pH ranged from 8.6 - <br />9.2. <br />The 24-hour LC50 for the June, 1988 reference toxicant test <br />was 15.2 mg/L sodium dodecyl sulfate as calculated by the <br />binomial method. ERT's acceptable range for < 29-hour old <br />Ceriodaphnia sp. is 2.9 - 20.3 mg/L sodium dodecyl sulfate. <br />Therefore, the test organisms were within the designated <br />sensitivity range. <br />+. <br />9 <br />