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f <br /> Paeifc EcoRisk Environmental Consulting&Testing <br /> 3.RESULTS <br /> 3.1 Effects of the Waste Sample"Fly Ash All on Fathead Minnows <br /> The results of this test are summarized in Table 1. Briefly, there was 100% survival at the Lab <br /> Control treatment;there was also 100% survival at each of the waste treatments. These results <br /> indicate that the LC50 of this sample is greater than the"hazardous waste"toxicity threshold of <br /> 500 mg/L,and that this sample should Dobe considered "hazardous"with respect to fish <br /> toxicity. <br /> The test data and summary of statistics for this test are presented in Appendix B. <br /> Table 1. Results of the hazardous waste toxicity evaluation of the <br /> "Fly Ash A" sample. <br /> Sample Treatment Level Mean % Survival <br /> Lab Control 100 <br /> 250 mg/L 100 <br /> 500 mg/L 100 <br /> ...... 750 mg/L 100 <br /> pH-Adjustment Control 100 <br /> LC50>750 mg/L <br /> 4.SUMMARY AND CONCLUSIONS <br /> The results of this toxicity test with"Fly Ash A"indicated that the LC5o of this sample was>500 <br /> mg/L,and the sample should thus=be considered a hazardous waste with respect to fish <br /> toxicity. <br /> 4.1 QA/QC Summary <br /> Test Conditions-Test conditions (pH, D.O., temperature,etc.)were all within acceptable limits <br /> for the fathead minnow acute toxicity test, with the following exception. Due to the elevated pH <br /> in all test treatment test solutions immediately prior to test initiation (i.e., >9.5 pH units),the pH <br /> in all test solutions was adjusted to 8.5±0.1 with reagent grade HCl;a pH-Adjustment Control <br /> treatment was initiated concurrently to evaluate any potential effects of the HCl addition. All <br /> analyses were performed according the laboratory Standard Operating Procedures. <br /> Negative Control-The biological responses for the test organisms at the Lab Control treatment <br /> were within acceptable limits. <br /> Page 3 <br />